Satbaev University, Almaty, Kazakhstan:

I. Yu. Motovilov, Assistant Professor, Department of Metallurgy and Mineral Processing, e-mail: motovilov88@inbox.ru
Sh. A. Telkov, Professor, Department of Metallurgy and Mineral Processing
M. B. Barmenshinova, Head of the Department of Metallurgy and Mineral Processing
A. N. Nurmanova, Assistant, Department of Metallurgy and Mineral Processing

Recently, the ore base of the Republic of Kazakhstan has been characterized by involvement of rebellious and off-balance ores into processing. In this regard, much attention is paid to the methods of preliminary enrichment of mineral raw materials. The use of various methods of preliminary ore beneficiation allows removing a part of barren rock as well as harmful impurities from processing, thereby increasing quality of the feedstock, both in terms of metal content and material composition. The barren rock removal in the head of the process, as a rule, improves the mineral flotation conditions, reduces the consumption of reagents and operating costs for further processing, as well as allows involving the off-balance and rebellious ores into processing. This article presents the results of the heavy suspension gravity dressing of the Shalkiya deposit widely classified lumpy lead-zinc ore, and the study of grindability of both the original ore and gra vity dressing products according to the Bond procedure. When studying the lead-zinc ore gravity dressability, it has been found that the grade with size grade of 40–8 mm is optimal, and it has been determined that the optimal separation density required for the floating fraction precipitation is equal to 2730 kg/m³. As a result of gravity dressing, the material with a high content of waste minerals in the form of quartz, carbonates and coaly substances, with permissible minimum zinc and lead losses, is released to the floating fraction. According to the Bond procedure, the Wi Bond ball mill work index has been determined for original ore, sinking and floating fractions. It has been established that the barren rock removing in the head of an engineering process will allow to increase the content of non-ferrous metals in the sinking fraction relative to their content in the ore, to reduce power inputs for the sinking fraction grinding in comparison with the original ore grinding and, correspondingly, to increase the cost-performance of further ore processing.

This work was supported by grant No. AP05133980.

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