CC BY
82021, Scienceline Publication
World's Veterinary Journal
World Vet J, 11(4): 578-586, December 25, 2021
DOI: https://dx.doi.org/10.54203/scil.2021.wvj73
The Effects of Calcination on Mineral Composition and Physical Properties of Limestones and Oyster Shells Derived from Different Sources
Khalil1*, Ridho Kurniawan Rusli1, and Andri2
'Department of Animal Nutrition and Feed Technology, Faculty of Animal Science, Andalas University Campus II Payakumbuh, Payakumbuh 26224, West Sumatra. Indonesia
2Department of Livestock Business and Development, Faculty of Animal Science, Andalas University, Padang 25163, West Sumatra, Indonesia Corresponding author's Email: [email protected]; ©orcd; 0000-0001-6359-8634
ABSTRACT
Limestones and oyster shells are normally used in raw or roasted meal form in the livestock diet. Calcination is intended to improve the mineral concentration and physical characteristics of limestones and oyster shells which vary based on different chemical compositions, textures, and impurities of their types and habitats. The present research aimed to study the effects of calcination on mineral composition and the physical properties of limestones and oyster derived from various sources. Limestone samples from three local limestone mining and oyster shell samples from three shellfish species were calcined by burning at a temperature of 800-1000°C. The calcined products were analyzed for mineral content (Ca, P, Mg, Cu, Zn, and Mn), physical properties (bulk density, tapped density, specific density, and angle of repose), and particle size. Results indicated that calcination had no significant effect on Ca and P concentrations but reduced micro mineral concentration. Limestones had a higher Mg concentration than that of oyster shells, and calcination increased Mg concentration. Calcined oyster shells had higher densities, percentages of fine particles, and lower angles of response. The results suggested that the type of limestones and oyster shells could determine their thermal decomposition properties.
Keywords: Calcination, Limestone, Mineral composition, Oyster shell, Physical property INTRODUCTION
Limestone-based carbonate and waste oyster shells are widely used as sources of Calcium in livestock diet in the West Sumatra region of Indonesia due to their availability and inexpensiveness. The local limestone meals are produced from diverse natural carbonate rocks as part of the Bukit Barisan cluster. The mineral composition and macroscopical characteristics of limestones show considerable variations due to their diversity in Calcium (Ca) and Magnesium (Mg) contents, crystalline structure, and natural impurities (Kilig, 2013). Limestone meal is usually labeled and sold as calcite (CaCO3) and dolomite (CaMg[CO3]2) for agricultural lime and animal feed considering that the ratio of Ca to Mg (MgCO3/CaCO3) varies depending on the type of limestone. Calcite is a light-colored white limestone, whereas dolomite is a light to dark brown limestones (Khalil and Anwar, 2007). The local calcite derived from Kamang, Agam district, West Sumatra, Indonesia, had also a high content of micro minerals (manganese, selenium, and iron, Khalil and Anwar, 2007). The use of the local limestones in the laying hen diet has a beneficial effect on egg production, eggshell quality, and bone mineralization (Khalil and Anwar, 2008).
The province of West Sumatra, Indonesia, located along the coast of the Hindian ocean, also abounds with bivalve shellfish living in various fresh water and terrestrial habitats of lakes, rivers, estuarine, and marine. Oyster shells deriv ed from freshwater and marine, which represented up to 56% of the total body weight of the shellfish and contained Ca of about 31-36%, exhibited different sizes and physical characteristics (Khalil et al., 2018). The shell could be processed in different forms of raw coarse, fine, or roasted for meals. However, the use of fine grinding and roasting of mussel shells in the diet of laying quails had no significant effect on egg production, eggshell quality, and feed utilization efficiency (Khalil et al., 2018). Therefore, it is of utmost importance to propose a suitable method for processing limestones and oyster shells in animal nutrition to enhance their food intake capacity and growth.
Calcination is a process through which mineral decomposition and the physical properties of limestones and oyster shells are upgraded using high temperatures (> 700°C) in thermal treatment (Kilig, 2013; Ha et al., 2019). The primary purpose of calcination is to eliminate water and organic matters and convert all or part of the calcium carbonate present into calcium dioxide (CaO, Ozer, 2003). Calcination increased essential mineral concentration, finer particle percentage, and surface area (Ozer, 2003; Ha et al., 2019), which can promote the food intake, digestibility, and absorption of the
ISSN 2322-4568
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essential mineral. Therefore, the calcined products might have better nutritional value, especially for young poultry and livestock animals that need minerals in small amounts and still have low feed intake capacity and nutrient digestibility. Calcium is an essential macromineral, which should be necessarily supplied in animals' diet, especially during earlier phases of the growth period as a robust skeleton is required to support body mass. Some physical characteristics, such as bulk density, tapped density, specific density, and particle size are related to the nutritional values of mineral feed since they determine the intake capacity, digestibility, and absorption in the digestive tract. Calcined oyster shells had also potent antibacterial activity (Li et al., 2014; Yao et al., 2014), which is mainly related to the alkaline effect caused by the hydration of CaO (Yao et al., 2014). The calcined limestones and oyster shells might be potentially used as a functional mineral for the improvement of feed storage stability and health status of young animals.
According to Boynton (1980), numerous factors determine the thermal decomposition quality of limestones and oyster shells, including crystallinity degree, types and quantities of impurities, as well as calcination duration and temperature. Limestones derived from various sources differ considerably in their chemical compositions, physical structure, and thermal decomposition properties (Kilig, 2013). There is an optimum calcination temperature and rate of heating for each type of limestones that can only be determined by conducting an experiment (Kantiranis et al., 1999). The size and physical characteristics of oyster shells vary according to habitats and species. Larger body sizes of mussels and seashells tend to have stronger shell properties. Therefore, it is hypothesized that there is a difference in the mineralogical composition, physical properties, and particle size distribution of calcined products of limestones and oyster shells which can be ascribed to the different types, sizes, and thermal behaviors of limestones and oyster shells during calcination. The objective of the present study was to determine the calcination impact of different limestone and oyster shell types derived from different habitats on mineral composition, physical properties, and particle size and also compare the thermal decomposition characteristics of the two materials.
MATERIALS AND METHODS
Limestone samples were collected from three local rock mining companies that mined and processed different types of natural rock deposits by crushing and grinding them into calcite and dolomite flour. Two companies produce dolomite flour (Halaban and Palupuh) which contained Ca and Mg. Another company (Kamang) produces calcite flour containing high Ca and very low Mg (calcite flour).
Samples of three types of shells with different sizes and hardness were derived from fresh water and seashell. There were lake mussel (Corbicula moltkiana), blood clams (Anadara granosa), and pond mussels (Pilsbryoconcha exilis). Lake mussels were purchased in the intact form of about 100 kg from fishers of Singkarak Lake (Tanah Datar district), Indonesia. Pond mussels of about 100 kg were collected from fishponds located in Kamang Mudik sub-district of Agam district, West Sumatra, Indonesia. The shell part of mussels was separated and prepared according to the procedures described by Khalil et al. (2018). Samples of the clamshell of about 50 kg were derived from a seafood stall located at the coastal area of Tanjung Mutiara subdistrict, Agam district of West Sumatra.
The limestones and shell samples were thermally calcinated by burning them in a modified furnace made from metal drums. Calcination lasted for about 48-72 hours with a temperature of 800-900°C until the limestones and shells turned white and brittle. The calcined products were then ground into meal form. Three samples of each calcined limestone and oyster shell meals along with uncalcined or non-calcined limestone and oyster shell meals were taken and then analyzed for minerals, physical properties, and particle size. The analyzed mineral content included Ca, P, Mg, Cu, Zn, and Mn using a spectrophotometer (AAS) according to the standard method described by AAS (1996).
The analyzed physical properties included bulk density, tapped density, specific density, and angle of response. Bulk and tapped densities were measured by a 100-mm graduated cylinder using the method described by Ruttloff (1981). Bulk density is the ratio of the weight of the sample (w) with the volume of space filled by the sample (v1), while tapped density is the ratio of the weight of the sample (w) with the volume of space filled by the sample after compacted (v2). Bulk and tapped densities(g/ml) were calculated using w/v1 and w/v2 in g/ml formulas, respectively. Specific density was measured using a 25-ml Piknometer Pyrex. The angle of repose was measured using a cylinder placed on a flat surface of beaker glass according to a method described by Geldart et al. (2006).
Particle size was determined by sieve analysis using a sieve shaker Retsch VS 1000 (Retch GmbH, Germany). About 300 g samples were sieved for 10 minutes using a set of sieves with discrete size ranges of 500-1000 ^m classified into four different levels of coarse (>1000 ^m), medium (1000-710 ^m), fine (710-500 ^m), and very fine (<500 ^m). The particle number of detained parts in each sieve was weighed, and the percentage of each particle size
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was then calculated. The percentage of each particle size was the weight of detained part divided with the total weight of the sample and multiplied by 100%.
The data obtained were expressed as mean and standard deviation (mean ± SD) and statistically analyzed using two-way variance analysis (ANOVA) in a completely factorial randomized design using IBM SPSS Software version 7. The Least Significant Difference (LSD) was applied to separate means. Significant differences were considered at p < 0.05 (Steel et al., 1997).
RESULTS
Effect of calcination on mineral composition
Data on the effect of calcination on the macro and trace minerals of limestones and oyster shell meals derived from different sources are presented in Tables 1 and 2. The limestones of Kamang and Halaban had significantly higher Ca than that of Palupuh's limestones (p < 0.05). On the other hand, Palupuh limestones contained considerably high Mg of 123.2-145.4 g/kg, compared to the other types of limestones (1.7-9.5 g/kg) and oyster shells (0.1-3.6 g/kg), which may be ascribed to its high Mg dolomite (p < 0.05).
There was no significant difference in the Ca concentration of oyster shells derived from different habitats (p > 0.5). The mean Ca content of the oyster shells (421.6 g/kg) was slightly higher than that of limestones (379.5 g/kg). The Mg-concentration of 2.74 g/kg of lake mussel was significantly higher than a pond and marine shells of 0.1 g/kg (p < 0.05). There was no significant effect of calcination on Ca concentration by both limestones and shell (p > 0.05). Numerically, calcined limestones and lake mussels had higher Ca concentrations than the uncalcined products. The highest Ca level was observed in calcined Kamang limestones followed by calcined lake mussel shells. Phosphorus concentration in both limestones and oyster shells ranging from 0 to 0.12 g/kg was very low and was not affected by the calcination process. However, calcination increased Mg concentration in both limestones and oyster shells, especially in Palupuh limestones (p < 0.05).
Palupuh limestones had significantly higher Cu, Zn, and Mn than Kamang's and Halaban's limestones. Moreover, Cu, Zn, and Mn were significantly higher in the Mussel shell than clamshell (p < 0.05). Except for Zn of dolomite and oyster shells, calcination reduced trace mineral concentration. Calcined Palupuh limestones had a significantly higher Zn concentration than the uncalcined ones (p < 0.05). Calcination significantly increased Zn concentration in all shells and the highest value was for lake mussels (p < 0.05). Data on trace minerals showed high variation, especially by Zn and Mn of oyster shells.
Effect of calcination on physical properties and particle size
Tables 3 and 4 compared the data on physical properties and particle size distribution of calcinated and uncalcined limestones and shells, respectively. Uncalcined Halaban limestones had the highest bulk and tapped densities but the lowest angle of repose among the uncalcined limestones. Palupuh limestones had a significantly higher specific density, compared to the Kamang and Halaban limestones (p < 0.05). Lake mussel shells had the highest bulk density, but the lowest specific density and angle of repose. Clamshells had the highest tapped and specific densities, while the highest angle of repose was for the pond mussel shell. Except for tapped and specific densities of Palupuh's limestone, calcination significantly increased densities but decreased the angle of repose of limestones (p < 0.05).
On the contrary, calcined shells had lower bulk and tapped densities but higher specific density and angle of repose than the uncalcined shells. The calcined mussel shell had the highest tapped densities and lowest angle of repose. Calcined limestones and oyster shells indicated nearly the same values regarding tapped and specific densities
Both uncalcined and calcined limestones were dominated by a very fine particle (< 500 ^m) composed of more than 90%. Palupuh's limestones possessed the highest portion of the coarse particles and the lowest percentage of very fine particles. There was no significant effect of calcination on the particle size of limestones (p > 0.05). The percentage of the very fine particles of calcines (< 500 ^m) was even lower than that of the uncalcined limestones (p < 0.05). On the other hand, the coarse particles (>1000 ^m) percentage of oyster shell meals were comparable to the fine particle in all uncalcined oyster shell meals. Pond mussel shells had the highest percentage of coarse particles, followed by lake mussel and blood clam. Calcination significantly reduced the particle size of the shells. The percentage of the coarse particle of shells decreased from 27-48.5% of uncalcined meal to 1.4-2.8% of calcined products, while the portion of the very fine particle increased from 29-45% to 78-86%
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Table 1. The effects of calcination on the mineral composition of limestones derived from three different types of rocks
Source of limestones
Mineral
Products
Mean
Kamang Halaban Palupuh
Uncalcined 398.98 ± 30.56c 439.03 ± 17.99a 279.84 ± 15.14e 372.61 ± 82.80
Calcium Calcined 428.41 ± 10.43ab 420.73 ± 12.87b 310.05 ± 2.24d 386.40 ± 66.23
Mean 413.69 ± 20.81a 429.88 ± 12.93a 294.94 ± 21.36B 379.51 ± 73.68
Macro mineral (g/kg) Phosphorus Uncalcined Calcined 0.12 ± 0.03 0.12 ± 0.02 0.11 ± 0.02 0.12 ± 0.02 0.11 ± 0.01 0.11 ± 0.01 0.11 ± 0.01 0.11 ± 0.01
Mean 0.12 ± 0.00 0.12 ± 0.01 0.11 ± 0.01 0.11 ± 0.01
Uncalcined 3.79 ± 1.38d 6.01 ± 1.64cd 123.20 ± 9.16b 44.33 ± 68.31f
Magnesium Calcined 1.68 ± 0.08d 9.51 ± 3.88c 145.43 ± 3.45a 52.20 ± 80.83e
Mean 2.74 ± 1.49C 7.76 ± 2.47B 134.31 ± 15.72a 48.27 ± 74.56
Uncalcined 2.23 ± 0.50 1.62 ± 0.38 3.98 ± 0.73 2.61 ± 1.22e
Cupper Calcined 1.69 ± 0.60 1.21 ± 0.75 2.16 ± 0.40 1.69 ± 0.47f
Mean 1.96 ± 0.38C 1.41 ± 0.29B 3.07 ± 1.29a 2.15 ± 0.84
Uncalcined 13.90 ± 1.57c 11.62 ± 0.75d 18.87 ± 0.94b 14.80 ± 3.71
Micro mineral (ppm) Zink Calcined 8.09 ± 2.23e 8.42 ± 2.00e 22.96 ± 1.62a 13.16 ± 8.49
Mean 11.00 ± 4.10B 10.02 ± 2.26B 20.92 ± 2.89a 13.98 ± 6.03
Uncalcined 37.16 ± 5.39d 57.06 ± 10.95c 245.12 ± 3.98a 113.11 ± 114.76e
Manganese Calcined 19.56 ± 3.81f 26.49 ± 4.02e 129.43 ± 2.75b 58.49 ± 61.53f
Mean 28.36 ± 12.44B 41.78 ± 21.61B 187.28 ± 81.8a 85.80 ± 88.13
a,b,c,d,e values within a row with different superscripts differ significantly (p < 0.05). A, B, C values within a row with different superscripts differ
significantly (p < 0.05). E F mean values of each micro mineral or macro mineral in the same column with different superscripts differ significantly (p <
0.05).
Table 2. The effects of calcination on the mineral composition of oyster shells derived from three different habitats
Oyster shells
Mineral
Products
Lake mussel
Blood clam
Pond mussel
Mean
Calcium
Uncalcined
Calcined
Mean
402.56 ± 30.56 420.73 ± 16.16 411.65 ± 12.85
457.65 ± 55.61 420.60 ± 19.41 439.12 ± 26.20
422.55 ± 32.94 405.23 ± 4.88 413.89 ± 12.25
Macro mineral (g/kg)
Phosphorus
Uncalcined
Calcined
Mean
0.10 ± 0.00 0.11 ± 0.01 0.11 ± 0.01
0.10 ± 0.01 0.10 ± 0.01 0.10 ± 0.00
0.10 ± 0.00 0.07 ± 0.05 0.09 ± 0.02
Magnesium
Uncalcined
Calcined Mean
3.79 ± 1.38
1.68 ± 0.08 2.74 ± 0.87a
0.01 ± 0.01
0.11 ± 0.01 0.10 ± 0.01B
0.08 ± 0.00
0.11 ± 0.02 0.10 ± 0.02B
427.59 ± 27.88 415.52 ± 8.91 421.55 ± 15.26
0.10 ± 0.00 0.10 ± 0.02 0.10 ± 0.01
0.83 ± 1.29
1.26 ± 1.98 1.04 ± 1.64
Cupper
Uncalcined
Calcined
Mean
3.54 ± 2.59 2.96 ± 2.33 3.25 ± 0.41ab
2.79 ± 0.81 2.79 ± 0.46 2.79 ± 0.00B
5.52 ± 0.68 4.28 ± 0.52 4.90 ± 0.88a
Micro mineral (ppm)
Zink
Uncalcined
Calcined
Mean
13.09 ± 5.69d 191.34 ± 15.07a 102.22 ± 126.04a
9.81 ± 1.40d 38.43 ± 3.44c 24.12 ± 20.24C
15.54 ± 2.72d 99.35 ± 12.00b 57.45 ± 59.26B
3.95 ± 1.41 3.34 ± 0.82 3.65 ± 0.43
12.81 ± 2.88f 109.71 ± 76.98e 13.98 ± 6.03
Uncalcined 246.08 ± 355.46 39.94 ± 5.12 660.52 ± 12.74 315.51 ±316.06
Manganese Calcined 30.49 ± 5.55 57.61 ± 1.40 503.23 ± 6.44 197.11 ± 265.46
Mean 138.29 ± 152.45B 48.77 ± 12.49C 581.88 ± 111.22A 256.31 ± 285.48
a,b,c,d values within a row with different superscripts differ significantly (p < 0 significantly (p < 0.05). E F mean values of each micro mineral or macro mineral in 0.05).
.05). A, B, C values within a row with different superscripts differ the same column with different superscripts differ significantly (p <
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Table 3. The effects of calcination on physical properties and particle size of limestones derived from three different sources_
Source of limestone
Products Kamang Halaban Palupuh Mean
Uncalcined 0.95 ± 0.03f 1.20 ± 0.04d 1.05 ± 0.04e 1.07 ± 0.13F
Bulk density (g/ml) Calcined 1.43 ± 0.01b 1.50 ± 0.02a 1.26 ± 0.01c 1.40 ± 0.12e
Mean 1.19 ± 0.34B 1.35 ± 0.21a 1.16 ± 0.15C 1.23 ± 0.10
Uncalcined 1.48 ± 0.04e 1.65 ± 0.06 b 1.59 ± 0.03c 1.57 ± 0.09f
Tapped density (g/ml) Calcined 1.79 ± 0.00a 1.76 ± 0.00 a 1.54 ± 0.00d 1.70 ± 0.14e
Physical Mean 1.64 ± 0.22B 1.71 ± 0.08a 1.56 ± 0.03C 1.64 ± 0.07
properties Uncalcined 2.55 ± 0.02e 2.56 ± 0.01de 2.71 ± 0.04a 2.61 ± 0.09 F
Specific density (g/ml) Calcined 2.61 ± 0.02c 2.69 ± 0.04a 2.65 ± 0.02b 2.65 ± 0.04e
Mean 2.58 ± 0.04B 2.62 ± 0.10 AB 2.68 ± 0.065 A 2.63 ± 0.05
Uncalcined 58.47 ± 5.66a 53.92 ± 3.22b 58.78 ± 1.91a 57.06 ± 2.72e
Angle of repose (°) Calcined 49.10 ± 0.50c 42.43 ± 2.83d 48.51 ± 0.52c 46.68 ± 3.70f
Mean 53.79 ± 6.62a 48.17 ± 8.13 B 53.65 ± 7.26 A 51.87 ± 3.20
Uncalcined 0.09 ± 0.02e 0.43 ± 0.01c 0.00 ± 0.00f 0.17 ± 0.22f
Coarse (>1000 ^m) Calcined 0.62 ± 0.02b 0.16 ± 0.03d 2.16 ± 0.05a 0.98 ± 1.04e
Mean 0.36 ± 0.38 B 0.29 ± 0.19 C 1.08 ± 1.52a 0.58 ± 0.44
Uncalcined 0.09 ± 0.03e 0.10 ± 0.08d 0.00 ± 0.00f 0.06 ± 0.06F
Medium (1000-710 ^m) Calcined 1.51 ± 0.01b 0.45 ± 0.06c 3.43 ± 0.05a 1.79 ± 1.51
Particle Mean 0.80 ± 1.00 B 0.28 ± 0.24 C 1.71 ± 2.42a 0.93 ± 0.73
size (%) Uncalcined 0.14 ± 0.08e 0.18 ± 0.01de 0.00 ± 0.00f 0.11 ± 0.10F
Fine (710-500 ^m) Calcined 4.21 ± 0.14c 4.26 ± 0.54b 5.40 ± 0.11a 4.62 ± 0.67e
Mean 2.17 ± 2.88B 2.22 ± 2.88ab 2.70 ± 3.82a 2.36 ± 0.29
Uncalcined 99.68 ± 0.04b 99.29 ± 0.08c 100.00 ± 0.00a 99.66 ± 0.36E
Very fine (<500 ^m) Calcined 93.65 ± 0.14e 95.13 ± 0.61d 89.02 ± 0.12f 92.60 ± 3.19f
Mean 96.67 ± 4.26B 97.21 ± 2.94a 94.51 ± 7.76C 96.13 ± 1.43
a, ,c, ,e, vaiues within a row with different superscripts differ significantly (p < 0.05). E F mean values of each micro mineral 0.05).
significantly (p < 0.05). , , values within a row with different superscripts differ or macro mineral in the same column with different superscripts differ significantly (p <
Table 4. The effects of calcination on physical properties and particle size of oyster shell meals derived from three different species
Oyster shell
Products Lake mussel Blood clam Pond mussel Mean
Uncalcined 1.43 ± 0.02a 1.40 ± 0.01b 1.36 ± 0.01c 1.40 ± 0.04e
Bulk density (g/ml) Calcined 1.33 ± 0.01d 1.10 ± 0.01e 0.96 ± 0.01f 1.13 ± 0.19f
Mean 1.38 ± 0.07 A 1.25 ± 0.21B 1.16 ± 0.28C 1.26 ± 0.11
Uncalcined 1.63 ± 0.02c 1.68 ± 0.01b 1.60 ± 0.03d 1.63 ± 0.04e
Tapped density (g/ml) Calcined 1.76 ± 0.03a 1.59 ± 0.01d 1.47 ± 0.01e 1.61 ± 0.15f
Physical Mean 1.69 ± 0.10A 1.63 ± 0.07 B 1.53 ± 0.09 C 1.62 ± 0.08
properties Uncalcined 1.74 ± 0.05e 2.73 ± 0.05a 2.30 ± 0.02 d 2.26 ± 0.50f
Specific density (g/ml) Calcined 2.57 ± 0.05bc 2.55 ± 0.03c 2.69 ± 0.03a 2.61 ± 0.08e
Mean 2.15 ± 0.59 C 2.64 ± 0.12a 2.50 ± 0.28 B 2.43 ± 0.25
Uncalcined 40.97 ± 1.36f 43.57 ± 1.65e 45.67 ± 0.58d 43.41 ± 2.35f
Angle of repose (°) Calcined 51.81 ± 1.98c 56.45 ± 1.94a 54.30 ± 1.23b 54.19 ± 2.32e
Mean 46.39 ± 7.66 B 50.01 ± 9.11A 49.98 ± 6.10A 48.80 ± 2.08
Uncalcined 31.65 ± 0.90b 27.75 ± 0.34c 48.51 ± 0.64a 35.97 ± 11.03E
Coarse (>1000 ^m) Calcined 2.82 ± 0.26de 2.61 ± 0.13e 1.42 ± 0.08f 2.29 ± 0.76f
Mean 17.24 ± 20.38 B 15.18 ± 17.78C 24.97 ± 33.30A 19.13 ± 5.16
Uncalcined 14.76 ± 0.22a 12.84 ± 0.36b 11.43 ± 0.62c 13.01 ± 1.67e
Medium (1000-710 ^m) Calcined 6.98 ± 0.50d 4.96 ± 0.19e 3.91 ± 0.11f 5.28 ± 1.56f
Particle Mean 10.87 ± 5.50a 8.90 ± 5.58 B 7.67 ± 5.32C 9.15 ± 1.62
size (%) Uncalcined 16.52 ± 0.13a 14.72 ± 0.20b 10.62 ± 0.21d 13.96 ± 3.02
Fine (710-500 ^m) Calcined 11.99 ± 0.28c 8.55 ± 0.45e 8.37 ± 0.04e 9.64 ± 2.04
Mean 14.26 ± 3.20a 11.64 ± 4.36B 9.50 ± 1.59C 11.80 ± 2.38
Uncalcined 37.07 ± 0.63e 44.68 ± 0.52d 29.44 ± 0.33f 37.06 ± 7.62
Very fine (<500 ^m) Calcined 78.20 ± 0.98c 83.88 ± 0.76b 86.29 ± 0.22a 82.79 ± 4.15
Mean 57.63 ± 29.09B 64.28 ± 27.71a 57.87 ± 40.21B 59.93 ± 3.77
a,b,c,d,e,f values within a row with different superscripts differ significantly (p < 0.05). E F mean values of each micro mineral 0.05).
DISCUSSION
significantly (p < 0.05). A B C values within a row with different superscripts differ or macro mineral in the same column with different superscripts differ significantly (p <
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The bioavailability and minor toxicity of CaC03, along with its abundant resources and low production cost, have encouraged the widespread use of limestones and oyster shell wastes as a mineral supplement in the livestock diet (Khalil and Anwar, 2007; Jovic et al., 2019). The results of the present study showed that Ca and Mg were the most important macrominerals contained in the local limestones and oyster shells. The Ca and Mg levels of uncalcined limestones in the current study were 379.5 g/kg and 48.3 g/kg, respectively, which were much higher than the Ca (138.4 g/kg) and Mg (37.6 g/kg) of basalt rock used as soil fertilizer in the East Lampung reported by Hendronursito et al. (2019) or three Brazilian limestones reported by Silveira et al. (2020). The type of limestones strongly determined the concentration of Mg, micro minerals, and physical properties (Khalil et al., 2011). Kamang and Halaban limestones were a high Ca type with a mean Ca content of more than 40%, and when properly calcined, high-grade calcium oxide would be produced (Okonkwo and Adefila, 2013).
In the present study, the Ca content of uncalcined oyster shells was relatively constant at 40.2-45.8%, which was slightly higher than the mean Ca level of 31.4-35.8% of oyster shells derived from different habitats in West Sumatra reported by Khalil et al. (2018). The difference between limestones and oyster shells is in the levels of Ca, Mg, Mn, bulk density, and particle size. Uncalcined limestones possessed higher Mg and percentage of fine particle and lower bulk density than the oyster shells, while the oyster shells had higher in Ca, Mn, bulk density, and coarse particle than limestone. The different species and habitats of shellfish affect the Mg and trace mineral composition and particle size distribution.
The process of calcination of limestones and oyster shells was conducted using thermal decomposition properties (Kilig, 2013). The thermal decomposition is intended to reduce the impurities and hence improve mineral concentration and bioavailability. Calcination is also designed to produce mineral products with finer and homogenous particle size and larger surface area, resulting in better mineral bioavailability and uniform physical properties. The calcined products, therefore, had distinctive nutritive values and better properties than the uncalcined or roasted meals. The present results indicated that calcination led to different effects on mineral composition, physical properties, and particle size distribution of limestones and oyster shells.
Generally, calcination increased macro minerals and density. On the other hand, particle size and trace mineral concentration decreased by calcination. Thermal decomposition is a temperature, chemical, and physical properties-dependent process (Kilig, 2013). This process started on the exterior surfaces and progressed inwards as the surrounding temperature increases, resulting in an increasing mass of CaO, large surface area, and hence, high chemical reactivity (Kantiranis et al., 1999). The larger and harder the limestones and shell fragments, the higher the temperature required for decomposition.
The present data on trace minerals of Zn and Mn showed high variation, especially in the calcined oyster shells. The differences in chemical composition were due to the water filterer role of oysters and mussels. The mineral composition of the oyster shells was affected the water condition where these mussels grew (Kurunczi et al., 2001). There is a difference in calcination conditions between limestones and oyster shells for optimal decomposition. The calcination process of oyster shells was completed in a shorter time and at a lower temperature than limestones (Ha et al., 2019). The optimum calcination temperature for limestones and oyster shells was about 900°C and 750°C, respectively, which was the temperature performed in traditional limekilns (Moropoulou et al., 2001; Park et al., 2021). According to Ha et al. (2019), the texture of calcite in limestones and oyster shells is more important than their chemical compositions that control the calcination temperature and specific surface area of the calcination products (Ha et al., 2019). They found that about 50% of the calcite in limestones was transformed to CaO, but for oyster shells, more than 80% of calcite was transformed after 5 hours by calcination at 700°C (Ha et al., 2019). Another study on limestones showed that the samples did not decompose completely at 1050°C (8% of the calcite remained unaffected in the core) (Kantiranis et al., 1999). Another study on dolomite in Aceh confirmed that the CaCO3 decomposed into CaO by calcination at a temperature of 900 °C and produced homogenous particles size (Sari et al., 2013). However, some shell materials remained untransformed even at higher calcination temperatures and after a more extended treatment due to the sintered surface, which covers the rest of the parts (Lee et al., 2018).
Results of the present study showed that there was a significant increase in the Mg level of dolomite limestones probably due to the substantial weight loss. According to Kantiranis et al. (1999), the greater the MgCO3 component is in dolomitic limestone, the greater the weight loss would be. Magnesium in limestones determines the carbonate mineralogy of limestones and their physical characteristics, such as color, brightness, hardness, and decomposition properties (Kilig, 2013). Since the MgCO3/CaCO3 ratio varies based on the type of limestone, the decomposition temperature differs among various types of limestones (Kilig, 2013). Carbonate limestones as a natural deposit rock contain various impurities, including SiO2, Al2 O3, and MgCO3 (Okonkwo and Adefila, 2013). Gupta et al. (2017) studied the effect of impurities on the quality of calcines reported that the presence of Al2O3 and SiO2 increases the activation energy, while the presence of MgCO3 lowers.
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The present results showed that the uncalcined oyster shells, especially pond mussels, contain a higher concentration of coarse particles. The presence of larger particles in the oyster shells led to a more heterogeneous distribution, compared to limestones. Physical characteristics are closely related to mineral composition, crystal structure, and particle size. Compared to limestones, the uncalcined oyster shells comprised a higher portion of coarse particles. The observed differences in particle size and distribution of particle size were related to the milling process. The grinding process in limestone mining companies consisted of several stages with different grinding systems, which produced more than 90% of very fine particles. The produced calcined and uncalcined oyster shells were ground using a laboratory hammer mill, resulting in only about 60% of the very fine particle. The larger particle size portion of oyster shells, compared to limestones, could also be associated with a higher hardness due to higher silica concentration (Hamester et al., 2012). The calcination of oyster shells significantly increased the portion of finer particles. It might contribute to better digestibility and absorption in the digestive tract, resulting in better nutritive values of the calcined product due to a larger surface area of finer particles (Ha et al., 2019). However, the increase in finer particle portions led to a significant increase in the angle of repose, and consequently a poorer flowability rate and less efficiency for bulk handling (Geldart et al., 2006).
The bulk and specific density of the limestones obtained in the current study were comparable to the values of three Brazilian limestones reported by Silveira et al. (2020). The present results indicated that the thermal treatment significantly increased the density values of both limestones and oyster shells. The specific density is closely related to intake capacity and mixture stability, therefore, higher density could result in higher mineral intake capacity. Ruttloff (1981) urges that the mixture of diet will be stable and not easily separated during handling and storage if the specific density value is not much different. The specific density, which is related to the texture characteristic of calcines, is smaller for oyster shells than for limestone; large mussels and seashells had structural solid properties. Oyster shells are composed of tiny prisms, foliated laths, and irregularly shaped folia of calcite with a loose texture, whereas the texture of calcite in limestones is crystalline and compact (Ha et al., 2019). The crystal structures of oyster shells primarily comprise aragonite and calcite, which have higher strengths and densities than limestones (Mosher et al., 2012). As Lee et al. (2011) reported, the oyster shells comprise several distinct layers composed of regular simple prismatic and nacreous or pearl layers. Bulk density is the relevant chemical composition of the limestone. In the present study, the bulk density values of 1.16-1.36 g/cm3 for limestones were lower than 2.65-2.72 g/cm3 of limestones in Turkey reported by Kilig (2013). Palupuh limestones had the lowest bulk density value of 1.16 g/cm3. On the contrary, Kilig (2013) said that bulk density increased with an increase in MgCO3 content.
CONCLUSION
The limestones vary in magnesium level and might be classified as calcite and dolomitic. Oyster shells derived from different habitats determine the magnesium and trace mineral composition. Calcination of limestones increased magnesium concentration and specific density but reduced micro minerals copper and manganese. The calcined oyster shell had a higher zinc concentration, specific density, fine particle portion, but lower bulk and tapped densities, coarse and medium particles than the uncalcined products. The results suggested that the type of limestones and oyster shells determined their thermal decomposition properties.
DECLARATIONS
Authors' contributions
Khalil and Andri designed the project, analyzed data, and drafted the manuscript. Khalil and R.K. Rusli prepared and calcinated minerals. R.K. Rusli and Andri edited and corrected the manuscript, Andri organized project implementation and administration. All authors checked the results of the data analysis and agreed to the final draft of the manuscript.
Funding
This work was a part of the project: Riset Publikasi Bereputasi (RPB) 2021. Andalas University financially supported this study, Grant No. T/12/UN.16.17/PT.01.03/Pangan-RPB/2021.
Acknowledgments
The authors are grateful to Drs. Sofyan, M.Si, Department. of Animal Nutrition and Feed Technology of IPB University, Bogor, provides laboratory facilities for mineral analysis. This work was a part of the project: Riset Publikasi Bereputasi (RPB) 2021. Andalas University financially supported this study, Grant No. T/12/UN.16.17/PT.01.03/Pangan-RPB/2021.
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The authors would like to thank Dr. Daryoush Babazadeh and Ali Sadeghi for their comments on the draft of this
manuscript
Competing interests
The authors declare no conflict of interest concerning research, authorship, and publication of this article. Ethical considerations
Ethical issues (including plagiarism, consent to publish, misconduct, data fabrication and/or falsification, double
publication and/or submission, and redundancy) have been checked by the authors.
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