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PROCESSING OF CARBONACEOUS ORES CONTAINING ULTRA-DISPERSED METALS WITH USING HIGH-FREQUENCY CURRENT

Anastasia Afanasova

Abstract

Due to the depletion of free-milling raw materials the involvement of new types of deposits is the strategy of developing mining industry of Russia. The black shale raw materials show interest as a non-traditional source of precious metals since its genetic and positional gold-carbon connection. The research is aimed at solving the problem of enrichment of sulphide ores, counting for more than 40% of the reserves in Russia. The aim of the research is to develop and scientifically substantiate the scheme for processing this type of ores in order to extract fine-dispersed noble metal particles (FNMP). In this work samples of sulfide carbonaceous ore and flotation concentrates were analyzed using complex precision methods of analysis: electron microscopy, spectral analysis with induction plasma, complex thermogravimetric analyzes, etc. Data on the composition of the organic constituent of the samples were obtained with the usage of complex thermogravimetric analysis. The presence of various types of kerogen and bitumen has been established. Experimental studies on the coarsening of FNMP from the initial ore and flotation concentrates using electromagnetic radiation have shown the effectiveness of this coalescence method. The data on the elemental composition of the samples and the amount of FNMP were obtained. Thus, studies on the extraction of FNMP from carbon sulphide ore have shown the possibility of effective usage of combination of electromagnetic action and classical enrichment methods to extract fine particles of noble metals. Electromagnetic treatment is one of a new departure in enrichment. The features of the electromagnetic effect on substances include uniform heating throughout of the volume, high speed and low inertia of heating, as well as the possibility of selective heating. Microwave processing has become widespread in metallurgy. The essence of technology is that surface of rock is directed electromagnetic waves of the microwave field, which instantly heat up to a temperature of several hundred degrees the interface between "ore and rock". When heated, the expansion of ore and gangue is not the same, and a strong mechanical stress arises at the boundary of these materials. As a result of electromagnetic exposure, ultrafine cracks appear and the rock is stratified. Consequently, the subsequent separation of noble metal inclusions from an empty rock is greatly simplified. Due to microwave and high-temperature exposure, minerals and gas-liquid inclusions are decremented and crystal-chemical water is released, resulting in additional defects. As a result, self-cleaning of sulphide minerals from atoms of scattered gold occurs by distilling it into peripheral parts of grains and intergranular space, where ultradispersed individuals are formed.

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DOI resolver: doi.org/10.5593/sgem2018/1.4/s04.016

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