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用分批反应器研究嗜热贝莱尔雷伊 (Brieleyi)酸杆菌 (简称A b 细菌 )浸出闪锌矿的动力学。在温度 65℃ ,pH =2条件下测定了A b 细菌在闪锌矿表面的吸附量 ,以及进行了闪锌矿粒的生物浸出试验。测定了闪锌矿浸出过程中前 30min时A b 细菌在矿物表面和溶液中的分布率 ,分布的平衡常数与朗格缪尔等温线相符。当向含A b 细菌的矿浆中加入 0 3、1 4kg/m3Fe3+时 ,由于形成黄钾铁矾类的铁沉淀物 ,导致浸出率明显下降。为了测定A b 细菌在闪锌矿表面生长动力学和化学计量参数 ,对分批生物浸出模型中不加Fe3+的浸出液采集的浸出数据进行了分析。这些生长参数表明 ,嗜热A b 细菌对闪锌矿的生物浸出率约是普通嗜中温铁氧化硫杆菌的 7倍。用分批浸出模型和估计的参数值模拟闪锌矿的初始粒度、细菌初始总浓度和闪锌矿矿浆的初始浓度三个重要变量对闪锌矿浸出率的影响。
The batch reactor was used to study the kinetics of leaching sphalerite of the thermophilic bacterium Brieleyi Brieley (Abb). The adsorption capacity of A b bacteria on the surface of sphalerite was measured under the conditions of pH = 2 at 65 ℃, and the biological leaching test of sphalerite was carried out. The distribution rate of A b bacteria on the mineral surface and solution was determined at the first 30 min during leaching of sphalerite. The equilibrium constant of the distribution was consistent with the Langmuir isotherm. When 0 3,1 4 kg / m3 Fe3 + was added to the slurry containing A b bacteria, the leaching rate was significantly decreased due to the formation of iron deposits of jarosite class. In order to determine the kinetics and stoichiometry of A b bacteria on the surface growth of sphalerite, the leaching data collected in the leachate without Fe3 + in the batch bioleaching model were analyzed. These growth parameters indicate that the bioleaching rate of the thermophilic A b bacterium to sphalerite is approximately seven times higher than that of the common mesophilic thermophilic fermentobacillus thiooxidans. The batch leaching model and the estimated parameters were used to simulate the effects of three important variables, the initial particle size of sphalerite, the initial total bacterial concentration and the initial concentration of sphalerite slurry, on the leaching rate of sphalerite.