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TECHNICAL SCIENCES
ADVANTAGES OF LOW-TEMPERATURE ROASTING OF MOLYBDENUM
CAKES
Khasanov A.S.1, Tolibov B.I.2, Pirnazarov F.G.3 (Republic of Uzbekistan) Em ail: [email protected]
'Hasanov Abdurashid Saliyevich — Doctor of Technical Sciences, Professor, Deputy ChiefEngineer for Science, JSC "ALMALYK MINING AND METALLURGICAL COMBINE", ALMALYK; 2Tolibov BehzodIbrohimovich - PhD Student; 3'Pirnazarov Feruz Gulomovich - Assistant Teacher, METALLURGY DEPARTMENT, CHEMICAL AND METALLURGICAL FACULTY, NAVOI STATE MINING INSTITUTE, NAVOI, REPUBLIC OF UZBEKISTAN
Abstract: in the article analyzed the results of laboratory experiments on the processing of sulphide molybdenum cakes in an intensive roaster of a new type in the conditions of the research and production association of Rare Metals and High Melting Alloys of JSC AMMC. Also given recommendations for improving and increasing the efficiency of the process of burning molybdenum cakes. Considered possibilities of improving the degree of oxidation in the processes of oxidative roasting, which increases the degree of extraction of the valuable component with minimal energy consumption.
Keywords: roasting, sulphide, molybdenium concentrate, molybdenium cake, desulfurization, extraction, roasting furnace, intensive roasting process.
ПРЕИМУЩЕСТВА НИЗКОТЕМПЕРАТУРНОГО ОБЖИГА МОЛИБДЕНОВЫХ КЕКОВ Хасанов А.С.1, Толибов Б.И.2, Пирназаров Ф.Г.3 (Республика Узбекистан)
'Хасанов Абдурашид Салиевич - доктор технических наук, профессор, заместитель главного инженера по науке, АО «Алмалыкский горно-металлургический комбинат», г. Алмалык; 2Толибов Бехзод Иброхимович — докторант; 3Пирназаров Феруз Гуломович — ассистент, кафедра металлургии, химико-металлургический факультет, Навоийский государственный горный институт, г. Навои, Республика Узбекистан
Аннотация: в статье проанализированы результаты лабораторных экспериментов по переработке сульфидных молибденовых кеков в печи нового типа для интенсивного обжига в условиях НПО Редких металлов и тугоплавких сплавов АО «АГМК». Также даны рекомендации по улучшению и повышению эффективности процесса сжигания молибденовых кеков. Рассмотрены возможности улучшения степени окисления в процессах окислительного обжига, что в дальнейшем повышает степень извлечения ценного компонента при минимальных энергозатратах.
Ключевые слова: обжиг, сульфиды, молибденовый концентрат, молибденовый кек, десульфурация, экстракция, обжиговая печь, интенсивный обжиг.
UDC 669.2.046
The authors propose a new method of roasting sulfide materials of molybdenum production. The method is carried out in the device, which is illustrated in the drawing, which presents a General view of the device and the process is as follows (Fig. 1.):
The furnace hearth with a gradient of 3-5° allows movement of the cinder to the discharge opening, as well as controlling the speed of the process, i.e. the residence time of the material in the furnace. Laboratory tests were carried out on the oxidative roasting of molybdenum cakes in the recommended developed laboratory furnace. The sulphide cakes of molybdenum intermediate were calcined after the initial leaching containing, sample No.1: 1.07% S and 8.62% MoO3, sample No.2 1.62% S and 8,37% MoO3. In the department No.3 of SPA "Rare metals and hard alloys" of JSC AMMC at a temperature of 600°C, the duration of the process of 1-1.5 hours in the enlarged laboratory conditions on a high-speed kiln was fired.
Fig. 1. General view of the laboratory installation of the proposed furnace. 1. Charging burner. 2. Furnace body. 3. Natural gas nozzle. 4. Tube for oxygen. 5. Air nozzles. 6. Hearth of furnace. 7. Spiral for heating the supplied air. 8. Partitions. 9. Discharging place. 10. Stovepipe
Advantages of the burning molybdenum cakes process in the laboratory furnace for intensive roasting:
1. Compared with the factory data, the duration of the process is significantly reduced, i.e. in the factory, the process lasts 4-6 h with mechanical agitation for every 30 min, in the recommended furnace the process lasts up to 2 h. With a decrease in the moisture content of the material, the duration of the process can be shortened to 1.5 h.
2. Desulphurization degree increases to 88%, instead of 67-69% (by industrial conditions). This is due to the access of oxygen, because In the intensive kiln, sulphide particles are kept in suspension and oxygen is provided throughout the material, as a result of which molybdenum sulphide particles (MoS2) are fully oxidized to MoO3.
3. Extraction of molybdenum from solutions increases to 94%. As a result of low-temperature firing (550 °C), the formation of caked cinder pieces is reduced and this ensures a high degree of extraction of the valuable component.
References / Список литературы
1. Hasanov A.S., Tolibov B.I. Roasting molybdenum cakes in a new type of kiln for intensive roasting. Mining bulletin of Uzbekistan.Vol.4, 2018. P. 131-135.
