HYDROMETALLURGICAL PROCESSING OF PERSISTENT GOLD-BEARING ORES BY TRADITIONAL BENEFICATION METHODS

摘要

Based on the analysis of the results of physical and chemical research, known methods and techniques for processing low-grade gold-containing raw materials have been offered and tested, the application of which will allow the most complete transfer of gold into solution. In the course of physical-chemical studies of the initial ore, such methods as X-ray diffraction X-ray fluorescence, mineralogical and chemical methods are used, in addition, using the assay method, the characteristics of the forms of finding gold in raw materials are given. According to X-ray phase analysis, the initial ore belongs to the siliceous type, which is confirmed by X-ray fluorescence and chemical analysis methods. The content of silicon in the ore is 28.8 %, which in terms of silicon oxide is about 62 %. The gold content is 1.02 g/t. The mineralogical analysis of the raw material showed that ore mineralization of gold is pyrite, and according to the assay there is practically no visible native gold in the ore, its content is 1.1 %, the fine-dispersed in the rock-forming minerals is 77.8 %. The following ore processing methods were tested: direct cyanidation, gravity enrichment with subsequent cyanidation, flotation enrichment followed by cyanidation. The recovery of gold under direct cyanidation was 70.6 %, under conditions of gravity ore enrichment, followed by cyanidation - 75.5 %. Cyanide leaching of the flotation concentrate allowed to convert 63.0 % of gold into the solution. Based on the results of the conducted studies low-grade ore of the Karyemoye deposit is recommended processing by cyanide leaching with preliminary gravitational concentration.