The choice of optimal binder for molybdenite concentrate granulation

Almalyk Mining and Metallurgical Combine is the supplier of molybdenite concentrate in the form of calcined granules. Granulation charge includes 92–90% of Mo-concentrate and 8–10% of kaolin. Decreasing of kaolin content leads to decreasing of the pellet durability, while its increasing leads to the difficulty of the access of oxygen in granules. In both cases, sulfur content in marketable product grows. However, the optimal content of kaolin in charge leads to the expense of the technology: dilution of concentrate with kaolin and cinder dilution with molybdenum by 4–5%. Besides, kaolin in cinder content complicates the sublimate Re2O7, ammonium leaching of molybdenum and gold and silver extraction from its processing cake. This paper searches the pelletization scheme, minimizing this disad vantage. The approach is based on partial or complete replacement of kaolin by organic component of the charge, burning during the granule calcining. Polyacrylonitrile and cellulose glicollic acid production wastes were chosen as an organic component. During the choice of the binding, alternative to kaolin, the authors were guided by its functional applicability as a component of the charge, giving hydrophilic and mechanical pro perties. As a result of the researches, there was defined the necessary range of these indicators for various combinations of mineral-organic binders. There were found the charge compositions, providing the required exploitation and technological properties of marketable product. There were carried out the successful pilot tests of charge mixtures. The advantages of new compositions were defined: the charge impoverishment is decreased, and valuable components are easier extracted from molybdenite concentrate. The change of the charge composition does not lead to the changes of pelletizing technology and processing of granulated product.This work was carried out according to the State Grant 7-FK-0-19005 (7-ФK-0-19005).

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