Heap biooxidation is the most economic option of treating processing plants tailings and refractory ores containing non-ferrous and precious metals and sulphides.Pyrite tailings of copper ore processing (Sample 1), tailings of sulphide copper-nickel ore processing (Sample 2) and double refractory gold-bearing ore (Sample 3) were studied.Autotrophic microorganisms Acidithiobacillusthiooxidans and Acidithiobacillusferrooxidans were used for the tests. The duration of heap biooxidation tests for Samples 1, 2 and 3 was 6, 10 and 16 months, respectively. The rates of copper and zinc recovery into solution during heap biooxidation of Sample 1 were 68% and 71%, respectively; the rates of copper and nickel recovery from Sample 2 were 50% and 75%, respectively. Base metals were extracted from solution to selective high-grade concentrates after biooxidation.Biooxidation tailings of Samples 1 and 3 were leached using an alkaline sodium cyanide solution. The recovery of gold from Sample 1 and Sample 2 was 65% and 85%, respectively.
In order to recovery base and precious metals from processing plants tailings of Southern Ural and the Murmansk region, test work on heap biooxidation using these products was carried out. These tests involved the chemical and mineralogical analyses of the samples, the bacteria adaptation for the products tested, heap biooxidation in percolation columns, base metals (copper, nickel, zinc) precipitation and gold cyanidation. The recoveries of base metals to the solution from the products of magnetic separation of the wastes were 75% Ni and 50% Cu. This work is aimed at studying sustainability of magnetic separation products and pyrite tailings biotechnological processing. Also, gold and base metals recovery to the solution and the options of base metals removal from the solutions were studied.
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