The working device comprises a concentrate ground to a fineness of 90 ~ 93% -0.063 mm, and the preparation of Stage I â…¡ segment with leaching pulp, bacteria purifying arsenic waste solution, and the agent required to prepare a milk of lime and media Control the leaching process, etc. The following parameters shall be controlled and tested during operation of the plant: slurry temperature, particle size characteristics of the concentrate, arsenic content in the solid and liquid phases, hydrogen ion concentration, concentration of Fe 2+ and Fe 3+ in the solution, per 1 ml of solution Bacterial content and bacterial activity (activity).
The kinetics of liquid phase composition changes were carefully studied during the experiment (Fig. 2 ). All slots Pa Qiuke pH drop, the content of Fe 3+ increases, increases from one tank to another tank Pa Qiuke arsenic concentration in the solution - is a unique marker for the normal process.
Studies of the bioactivity of cultures have shown that bacteria are least active at the beginning of the leaching process, as well as in contact tanks and circulating solutions. In the middle of the leaching process, when the optimal conditions for the development of the culture are formed, the bacteria are most active, and then fall again due to the accumulation of acid and arsenic at the end of the leaching (see table).
The degree of sulphide oxidation is the main indicator determining the effectiveness of the leaching process. Tests conducted showed that the major part (> 60%) of arsenic pyrite in the preparation stage, i.e. in the contact tank has been oxidized (FIG. 3).
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