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The past 10 to 15 years, Russia was a big success in metallurgical beneficiation and hydrometallurgical and pyrometallurgical combine aspects smelt joint process can handle depleted ore and refractory ore complex composition. In the case of the combined process of selecting and smelting, the recovery rate of the useful components is increased by 5% to 10%, the mineral raw materials are comprehensively utilized, and the production waste is reduced.
Refractory Gold Ore formulated containing arsenic efficient separation process, the gold recovery process can be increased by 5% to 10% and reduce the amount of toxic cyanide.
In the beneficiation circuit, only the easily selected useful minerals are recovered into the concentrate, and the undissociated minerals are sorted into the middle ore and then treated in the metallurgical workshop. Under the premise of rational consideration of the metallurgical treatment of the ore, the enrichment ratio in the rough processing stage of the mineral raw material is determined according to the mineral composition and structure of the ore.
Norilsk Mining Company exploded successfully employed a similar oxidation process concentrate pyrrhotite pressure. The Russian Mineral Processing Research Institute and the National Nonferrous Metals Research Institute use a pressure leaching method combined with flotation and chlorination to treat copper - zinc ore. This process can increase copper recovery by 4% to 12% and zinc recovery by 10%. % to 25%, precious metal recovery rate increased by 10% to 20%. The combined process is used to treat the arsenic polymetallic ore in the Ozer deposit. The zinc recovery rate is increased to 80% to 90%, and the lead recovery rate is increased to 70% to 80%. The combined process includes lead-zinc mineral mixed flotation and zinc pressurization. Leaching and leaching lead from the chloride in the slag.
The ore of the МалеевÑк deposit is metamorphic ore. Some of the pyrite variants have higher specific magnetic susceptibility. If the ore is directly flotation, the zinc concentrate has high copper impurity content and low metal recovery rate. The ore is preselected by magnetic separation, and the magnetic product is subjected to sulfuric acid leaching, lime hydroxide precipitation, sulfuric acid dissolution, iron powder precipitation, and the non-magnetic product is treated by a standard flotation process to obtain copper concentrate, zinc concentrate and lead concentrate. The recovery rates of zinc, lead and copper in the same name products increased by 5.54%, 1.55% and 12.85%, respectively, and the zinc, lead and copper grades of the same name increased by 2.77%, 0.97% and 1.56% respectively. The copper content in the zinc concentrate decreased from 1.97% to 0.65%.
The Udokan copper ore has a complex mineral composition and contains a large amount of copper oxide minerals. The low-grade oxidized copper sulfide concentrate is not suitable for conventional fire treatment. The semi-industrial test results of the ore oxidation-sulfation roasting-sulfuric acid leaching-hydrolysis process show that the oxidation-sulfation roasting temperature is preferably 500 ° C. At this time, the copper leaching rate is high, and the amount of ferrite formed during leaching is small. The iron, aluminum and silicon impurities in the leachate can be removed by a two-stage hydrolysis purification process of lime and sodium hydroxide neutralizer. The copper leaching rate of this process is 90%.
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