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Ад UNIVERSUM:
№4(121)_m ТЕХНИЧЕСКИЕ НАУКИ_апрель. 2024 г.
CHEMICAL ENGINEERING
DOI - 10.32743/UniTech.2024.121.4.17420
KINETICS OF HYDROCHLORIC ACID DECOMPOSITION OF MUSCOVITE MONOMINERAL
Farhod Mirzoev
Applicant, Institute of Water Problems, Hydropower and Ecology of the National Academy of Sciences of Tajikistan,
Republic of Tajikistan, Dushanbe E-mail: _ [email protected]
Azim Ibrohim
Cand. of Tech. Sc.,
Academician of the Engineering Academy of Tajikistan, Republic of Tajikistan, Dushanbe city
Bodur Mirzoev
Dr. of Tech. Sc., Branch of the Moscow State University named after. M.V. Lomonosov in the city of Dushanbe, Republic of Tajikistan, Dushanbe
Ziyodullo Obidov
Dr. of Chem. Sc., Prof., Tajik technical university named after academician. M.S. Oshimi,
Republic of Tajikistan, Dushanbe
КИНЕТИКА СОЛЯНОКИСЛОТНОГО РАЗЛОЖЕНИЯ МОНОМИНЕРАЛА МУСКОВИТА
Мирзоев Фарход Бодурович
соискатель,
Институт водных проблем, гидроэнергетики и экологии Национальной академии наук Таджикистана, Республика Таджикистан, г. Душанбе
Азим Иброхим
канд. техн. наук, академик Инженерной академии Таджикистана, Республика Таджикистан, г. Душанбе
Мирзоев Бодур
д-р техн. наук,
филиал Московского государственного университета им. М.В. Ломоносова в городе Душанбе, Республика Таджикистан, г. Душанбе
Обидов Зиёдулло Рахматович
д-р хим. наук, проф.,
Таджикский технический университет им. акад. М.С. Осими, Республика Таджикистан, г. Душанбе
Библиографическое описание: KINETICS OF HYDROCHLORIC ACID DECOMPOSITION OF MUSCOVITE MONOMINERAL // Universum: технические науки : электрон. научн. журн. Mirzoev F.B. [и др.]. 2024. 4(121). URL: https://7universum. com/ru/tech/archive/item/17420
АД, UNIVERSUM:
№4(121)_& ТЕХНИЧЕСКИЕ НАУКИ_апрель. 2024 г.
ABSTRACT
A method for conducting kinetic tests has been proposed for the decomposition of the muscovite monomineral using the hydrochloric acid method. The kinetic characteristics of muscovite sintering under isothermal conditions have been studied. It has been shown that the extraction of AbO3 from the monomineral muscovite increases significantly with increasing temperature and sintering time. It was determined that the maximum extraction of AhO3 occurs during sintering for 120 minutes and a sintering temperature of 1100°C, amounting to 91.6%. The kinetic and energy parameters of the technological process were calculated. It has been established that the kinetic curve lines characterizing the sintering of muscovite depending on the temperature and sintering time at 700 and 800°C are rectilinear; then, with an increase in temperature from 900 to 1150°C, they transform from rectilinear to parabolic.
АННОТАЦИЯ
Предложена методика проведения кинетических испытаний с целью разложения мономинерала мусковита солянокислотным способом. Изучены кинетические характеристики спекания мусковита в изотермических условиях. Показано, что извлечение Al2O3 из мономинерала мусковита значительно увеличивается при повышении температуры и времени спекания. Определено, что максимальное извлечение Al2O3 происходит при спекании в течение 120 минут и температуре спекания 1100°C, составившее 91,6%. Рассчитаны кинетические и энергетические параметры технологического процесса. Установлено, что кинетические кривые линии, характеризующие спекание мусковита в зависимости от температуры и времени спекания при 700 и 800°C являются прямолинейными, далее при увеличении температуры от 900 до 1150°C из прямолинейных переходят в параболические.
Keywords: kinetic and energy parameters, hydrochloric acid decomposition, muscovite monomineral.
Ключевые слова: кинетические и энергетические параметры, солянокислотного разложения, мономинерала мусковита.
Introduction
The problems of rational use of mineral resources, minerals [1-3], alloys [4, 5], melt [6] and raw materials [7, 8] are solved through the development of technological solutions for the extraction, analyze and processing of mineral resources, which are also environmentally friendly technologies [1-3].
The purpose of the work is to study the kinetics of the solar acid decomposition of the monomineral Muscovit to obtain useful components.
Research methodology. The methodology for the study of the decomposition of monomineral muscovit in a solar acid method covers the effects of temperature, duration of the sintering process and the mass ratio of components to increase the content of AhO3 as part of the speck. Kinetic studies were carried out for hydrochloric acid extraction of aluminum oxide from muscovite-containing raw materials. The resulting kinetic line curves follow a first-order differential equation:
The equation for plotting the dependence of Lg (1-a) on decomposition time is mathematically converted into the following equation:
Lg(l-a) = -kx/2,30S+const.
The kinetics of the decomposition process was studied under isothermal conditions with the exposure of the shiht in the muffle furnace for 10-50 minutes.
Discussion results. The kinetic curves of the line characterizing the course of this process are up to 60°C straight, and over 60°C acquire a parabolic character. For the decomposition process to proceed, the temperature region >80°C is of practical interest, in which almost complete extraction of aluminum oxide is achieved within a short period of time. Hydrochloric acid decomposition of muscovite-containing raw materials with an increase in temperature from 25 to 96°C and decomposition time to 100 minutes, Al2O3 recovery increases slightly, from only 2.9 to 29.9% (fig. 1).
Further kinetic studies were devoted to determining the activation energy of the hydrochloric acid decomposition process of muscovite-containing ore. For this purpose, a graph was constructed in the coordinates Lg1/(1-a) and time (t) (fig. 2).
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Figure 1. Effect of decomposition time on AhO3 recovery at different decomposition temperatures
These dependence lines obtained a negative slope, which is equal to k/2.303. The values of the activation energy (E) and the pre-exponential factor (ko) in were
calculated based on the Arrhenius equation and the plotted graph using the following equations: ^ _ ^ Jf
Figure 2. Dependencies: (a) lg (1/(1- a)) on time at different temperatures, (b) Lgk on absolute reverse temperature
As part of the study of the kinetic parameters of the process, the dependence of the logarithm of the extraction rate constant Lgk on the absolute reverse temperature (1/TT03) was determined. It was shown that the calculation points make up an almost straight line, the slope of which was used to calculate the activation energy (E) of the hydrochloric acid decomposition of muscovite-containing raw materials. The value of E turned out to be 38.5 kJ/mol. According to the calculated activation energy value, it can be concluded that hydrochloric acid decomposition occurs at the boundary of the kinetic and diffusion regions (table). Also, for
the hydrochloric acid decomposition of muscovite monomineral, kinetic parameters were studied, the study was carried out with variations in a wide range of parameters such as temperature in the range from 25 to 96°C, the decomposition time varied in the range of 30-45-60-75-90-105-120 minutes. For decomposition, HCl (20%) was used, taken in 100% of the stoichiometric amount from the calculation of the formation of aluminum, iron and potassium chlorides. In each experiment, kinetic curves of the lines corresponding to the recovery of aluminium oxides (A^Os) and iron oxides (Fe2O3) from the muscovite-containing feedstock were obtained (table).
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Table 1.
Effect of temperature and time of hydrochloric acid decomposition of muscovite monomineral on AI2O3 and Fe2O3 recovery
Extraction AI2O3, %
N toC Decom position time (t), min
20 40 60 80 100
1 25 2.9 4 4.8 5.7 6.3
2 40 3.8 5.8 7.2 8.6 10
3 50 4.9 7.8 10.1 12.2 14.5
4 60 7.2 12.2 16.1 18.4 20
5 70 10 16.2 20.9 23.2 24.2
6 80 12.4 20.2 24.9 26.8 28.3
7 96 16 23.6 27.2 28.8 29.9
Extraction Fe2O3, %
№ toC Decom position time (t), min
30 45 60 75 90 105 120
1 25 2.4 4.9 7.59 10.1 13.7 17.6 22.1
2 40 4.2 9 13.9 20 27 33.4 39.1
3 50 8.7 14.8 21.9 29.4 36.6 43.8 52.5
4 60 15 23.7 33.6 42.4 51.8 61.6 69.9
5 70 26 39 52.4 64.7 73.4 79.8 84.9
6 80 35.2 52.1 66.3 76.5 83.9 89 91.6
7 96 53.1 69 79.4 86.7 91.5 95.3 97.9
Conclusions
The mechanisms of decomposition of individual minerals and extraction of compounds Al, Fe, Na and K into productive solutions in the form of chlorides of these chemical elements are influenced by various external factors, among which the main ones are the following - temperature and time of decomposition, HCl concentration and its dosage, these parameters often include the size of mineral particles after their grinding.
The kinetic crooked lines characterizing the sintering process of the monomineral of the muscovite from temperature are straightforward (700-800 ° C) and parabolic (900-1150 ° C). It was established that the maximum extraction of AL2O3 from the monomineral of the muscovit occurs when sintering for 120 minutes and a sintering temperature of 1100 ° C, which was 91.6%.
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