The stubborn and difficult-to-lead portions of the concentrate are fed to the Pachuk tank before leaching. At the end of the leaching (i.e., after 120 hours) the degree of oxidation of pyrite arsenic 80 to 82%, bacterial leaching arsenic sulfide residue in an amount of 0.92 to 1.02%. Considering that the yield of this product is 83% of the original concentrate , the arsenic pyrite oxidation degree is 87-91% .
The recycling of the spent solution plays a large role when tested in a continuous unit. In this case, the recycled solution should remove components that inhibit bacteria, including arsenic.
The method of removing arsenic is to neutralize the used waste solution with lime milk to bring the pH to 2.9~3.0 . At this pH , the arsenic content of the solution is from
It should be noted that when using a circulating bacterial solution, the viability of the bacteria is rapidly recovered during the leaching process.
The residue obtained during the bacterial leaching process is cyanated like the original concentrate (solid: liquid = 1 : 2-4 ; KCN - 0.1% , CaO - 0.01 ~ 0.02% ). The test results show that the recovery rate of gold is only 7~10% for the direct cyanidation of the original concentrate , and the recovery rate of gold is 88~90% for the cyanidation of the residue after leaching .
Since the effect of cyanidation is very good, it is recommended to use a comprehensive process including the method of oxidizing sulfides with microorganisms in the treatment of gold-arsenic concentrates (Fig. 4 ).
Tests have shown that the separation of fine-grained dispersion boxes from stubborn gold - arsenic concentrates by bacterial leaching is very effective, and all equipment and devices work stably and reliably, and are easy to operate.
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