Satbaev University, Almaty, Kazakhstan:

B. S. Baimbetov, Аssociate Professor, e-mail: b.baimbetov@satbayev.university
А. А. Bekisheva, PhD student, e-mail: a.bekisheva@satbayev.university
K. D. Aitenov, Аssociate Professor, e-mail: K.Aitenov@satbayev.university

The roasting thermodynamics of sulfides of molybdenum, rhenium and other components of complex concentrates in the presence of sodium carbonate and oxygen is calculated. In the presence of sodium carbonate, sulfides and oxides of these metals can form sodium molybdate, sodium perrhenate, sodium arsenate and sodium antimoniate. Aqueous solubility of sodium molybdate and sodium perrhenate assumes a possibility of rare metals as well as sulfur separation from non-ferrous metals, iron and waste rock. Part of silica and arsenic can be transferred into aqueous solutions. In a sulfide-soda-sulfate technology, the pelletized batch roasting is proposed, and indicators of the major metals (Cu, Zn, Pb, Fe) extraction from the process flowsheet products are given. In this work, experiments on roasting in the conditions of an oscillating pulsating layer at temperatures of 550, 600, 650 ^oС were carried out with a mixture of concentrates in order to study the possibility of eliminating the batch pelletizing operations and the need for subsequent drying, as well as evaluating the distribution indices of valuable components. The roasting burden composition was 10 g of the weighed concentrates mix samples and 22 g of soda ash. The soda consumption has been chosen taking into account the sulfur total binding and adding 10% of excess on the impurities binding. Air consumption has ranged from 17 to 34 l/h, the burning duration was 90 minutes. Resulting from the analysis of the roasting process, aqueous and acid leaching of calcine, the summary is calculated and extraction of components into a sodium sulfate aqueous solution, metal sulfates acid solution and sulphate lead cake is determined.

The work is carried out in the framework of the program 217 “Development of science”, subprogram 102 “Grant financing of scientific research” of the Republic of Kazakhstan, theme No. АР05133403.

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