Enhanced Microbial Leaching Of Oxidized Copper Pilot Study

Bioleaching technology for its low cost, low investment, simple, and less pollution, suitable for grade ore processing and utilization, which indicates the advantages of dealing with low-grade ore and has the potential to expand the amount of available resources. with the development and utilization of China's copper,it has a great potential and application prospects.The bacteria used in this paper were isolated from the acid mine drainage wasted in Dong Xiang. There was an expioratory experiment on some YunNan oxidation copper ore . Leaching the oxidation copper and part of second copper sulphide adopted normal temperture acid picking firstly, then the low-grade slag were used Erlenmeyer flask to leach because of the oxidation rate too high to reach 79%. The analysis stress on the part of bioleaching and the effects of several variables on leaching rate. It was indicated that the bacteria grew best when the temperature was 30℃, the pH value was 2.0 and the concentration of copperion was below 0.015mol/L .The recovery of pickle test in normal temperature was 80.13% in optimum condition. In the system of bacter ialleading, copper leaching rate reached 61.3% after 35 days,while on the same condition but no bacter, the leaching rate achieved only 32.5%. The best conditions for Erlenmeyer flask experments were as follows: pulp density was 10%; inoculum size was -0.074+0.045mm; pH value was 2.0; bacterialload was 10%. Contrast test was done, which mixed into catalyze ion for buildup leaching effect, it was found that the leaching rate was 70.25%.Eh-pH map of S- H2O,Fe- H2O,Cu-Fe-S-H2O were portrayed to analysis the dissolution process. The dissolution behavior of chalcopyrite was determined by the crystal structure. The catalytic process of Ag+ was accelerated with having bacteria.