SPECIFIC FEATURES OF THE "SUZDALSKOE" DEPOSIT SULFIDE RESISTANT ORE BIOOXIDATION TECHNOLOGY
The substantiation of the bio-oxidation technology for the processing of refractory sulfide ores is presented on the example of gold ore concentrate from the Suzdalskoye deposit. The bioleaching process is optimal both from a technological and economic point of view, and is currently becoming the main technology used for the processing of refractory gold ores. Sulphide refractory ore during experimental processing at the production site of the gold recovery plant of the Suzdalskoye deposit was subjected to preliminary technological operations. The gold concentrate was fed into the bacterial leaching composition in the form of a suspension. The biodegradable bacteria Thiobacillus ferrooxidations and Leptospirillum ferrooxidations were used for oxidation. The technology is based on the oxidation of acidophilic sulfide mineral groups of chemolithotrophic microorganisms capable of using sulfides, sulfur and its reduced compounds as a substrate for life. The process of bacterial oxidation took place in a bioreactor, where bacteria, by oxidizing sulfide arsenous ores, destroy the crystal lattice of sulfides and open up pyrite or arsenopyrite, providing reagents with access to disseminated finely dispersed gold. As a result, a high degree of metal recovery was achieved. The main parameters of the biological oxidation technology for these concentrates of sulfide refractory ores have been established: the temperature of the medium is 38-40 ° C, the pH level is 1.4-1.6, the concentration of dissolved oxygen in the reactor is from 2 to 4 g/t.