Authors: A.I. Afanasyev, V.Ya. Potapov, D.S. Stozhkov, V.V. Potapov, A.A. Chirkova

Title of the article: Electric pulse destruction of balanced copper-zinc ore

Year: 2021, Issue: 6, Pages: 32-37

Branch of knowledge: 05.05.06 Mining machines

Index UDK: 622.732

DOI: 10.26730/1816-4528-2021-6-32-37

Abstract: Recently, the natural content of useful components in the original ore has been decreasing, and therefore the urgency of the problem of preliminary separation of the rock mass increases, since it will allow removing a large mass of waste rock at the first stages. The crushing operations used in the ore processing process are the most expensive and energy-intensive; therefore, it is efficient to separate the depleted ore fraction in the crushing and screening complex in lumpy form. Effective softening of sulfide ores can be carried out by thermal, electrical and chemical breakdown. The parameters of thermal breakdown (voltage and current) significantly depend on the content of conductive inclusions in the rock. When a current is passed through a piece, the sulfide grains expand and separate from the gangue, and in some cases, when the sulfides form an interlayer, the piece breaks. Therefore, thermal (electrical) breakdown was taken as an identifier for a lump containing sulfides with a certain concentration. The effectiveness of the thermal effect on the pieces was determined by the degree and energy consumption of crushing. The article discusses the technology of separation of sulfide-containing ore with a low metal content after exposure to discharge - pulse destruction. The relationship between the electric breakdown voltage and the sulfide content in copper-zinc ore is shown. The results of the experiments carried out to assess the consumption of specific energy when exposed to an electric pulse on pieces of lean ore, depending on the valuable component. An attribute for ore separation has been substantiated and a simulation model of the process has been compiled. The total energy consumption for technological processes of discharge-pulse separation of poor sulfide ores has been determined. It was found that the degree of crushing of the electrically treated ore was 3.75, and that of the non-processed ore - 2.94. The specific energy of destruction of the electrically treated ore was 1.67 kJ / kg, and that of the untreated ore - 2.21 kJ / kg, i.e. more 1.33 times. A reduction in the volume of rock mass and a decrease in the relative energy of destruction will lead to a corresponding decrease in the unproductive energy consumption for crushing.

Key words: poor copper-zinc ores breakdown voltages energy intensity of electrical separation degree of crushing yield of fine fractions specific energy of destruction

Receiving date: 13.11.2021

Approval date: 03.12.2021

Publication date: 24.12.2021

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