Published on 12 January 2018
Purpose. Sustainable development of the territories is possible at the expense of changing the structure of the
most capital-intensive sphere of the country’s national economy-the mining complex. The goal can be achieved by increasing the number of small mining enterprises, which simultaneously form an active social stratum of entrepreneurs, without which a complete market economy is inconceivable. Methods. The method of solving the problem under consideration is the creation for the small gold-mining enterprises of the processing of gold-containing concentrates on site with the production of the final highly liquid commodity product in the form of ingots of the alloy Dore. The urgency of this approach is determined by high insurance and transportation costs (0.30 rubles / y) and refining (8.40 rubles / yr), discrepancies between supplier and processor in determining the value of commodity concentrates, long-term and unreliable payments for delivered products, low recovery Gold from poor concentrates, which significantly affects the economy of the enterprise. To refine the gold-containing slices, a technological line has been developed in the form of a series of vacuumthermal reactors (for the removal of non-ferrous sulfides of sublimation), a centrifugal des integrator (for the destruction of aggregates formed by locally fused minerals), a magnetic separator (to remove pyrite after thermal decomposition to Magnetic pyrrhotite) and a magneto-liquid separator (to isolate the product, the quality of which corresponds to the requirements of gold refining). With vacuum-thermal sublimation, galena, antimonite, and arsenopyrite completely completely pass through sublimation into metallic vapor and then into condensate. Moreover, the efficiency of the process is the highest, provided that the sublimation and condensation temperature differ by 100-200 ° C due to the suppression of the process of volumetric condensation of metallic vapors. This range of sublimation and condensation temperatures allows both processes to be conducted in the same apparatus, which reduces capital costs and operating costs. Magnetic pyrrhotite can be isolated from the disintegrated cake of vacuum-thermal sublimation by the magnetic separation method practically without loss of gold. To separate from the non-magnetic fraction of the product directed to the melting at the site of its production, a separation process in colloidal solutions of magnetic particles is used - in ferromagnetic liquids quasi-charged by an external non-uniform magnetic field. Results. Finishing of heavy concentrates with the developed technology makes it possible to increase gold extraction by 10.95%. Melting of the heavy fraction of the magneto-liquid separation takes place without the formation of matte, which also reduces the loss of gold.
Categories: Articles, Technical-and-Technological-Issues-of-SDMT
Tags: магнитожидкостная сепарация, золотосодержащие шлихи, технология доводки, вакуум- термическая сублимация, десублимация, центробежная дезинтеграция, магнитная сепарация
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)