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以氧化亚铁硫杆菌(Acidthiobacillus ferrooxidans,At.f)为研究对象,研究了铝离子浓度对黄铜矿浸出体系At.f菌氧化活性、黄铜矿表面吸附细菌数量以及铜浸出率的影响,并对其之间内在联系进行了考察。研究结果表明,浸出体系铝离子浓度在所研究的0~20 g·L-1范围内,对细菌氧化活性的影响有明显差异。铝离子浓度为1 g·L-1时,细菌氧化活性最好,浸出15d后,体系氧化还原电位便可由381m V升高到588m V左右,Fe2+氧化率达到98.49%,体系p H值由2.11下降到1.44;超过1 g·L-1后,细菌氧化活性逐渐降低,Fe2+氧化率下降,铝离子浓度为20 g·L-1时,浸出45d后,体系氧化还原电位仅为400 m V左右,Fe2+氧化率也仅为40%左右。矿物表面吸附细菌数量、浸出体系铜浸出率均随铝离子浓度增加先升高后降低,铝离子浓度为15 g·L-1时,浸出体系铜离子浸出率最高,可达71.39%,矿物表面吸附细菌数量也最多,表明铜浸出率与矿物表面吸附细菌数量正相关。
The effect of aluminum ion concentration on the oxidative activity of At.f bacteria in chalcopyrite leaching system, the amount of bacteria adsorbed on the surface of chalcopyrite and the leaching rate of copper was studied using Acaiobacillus ferrooxidans (At.f) as the research object. And inspected the internal relations between them. The results show that the concentration of aluminum ions in the leaching system within the range of 0 ~ 20 g · L-1, the effect on bacterial oxidation were significantly different. When the concentration of aluminum ions was 1 g · L-1, the bacterial oxidation activity was the best. After 15 days of leaching, the oxidation-reduction potential of the system increased from 381 mV to 588 mV, the oxidation rate of Fe2 + reached 98.49% Decreased to 1.44. When the concentration exceeded 1 g · L-1, the bacterial oxidation activity decreased and the oxidation rate of Fe2 decreased. When the concentration of aluminum ion was 20 g · L-1, the redox potential of the system was only about 400 mV , Fe2 + oxidation rate is only about 40%. The amount of bacteria adsorbed on the surface of the mineral and the leaching rate of copper in the leaching system first increased and then decreased with the increase of the concentration of aluminum ions. When the concentration of aluminum ions was 15 g · L-1, the leaching rate of copper ions was the highest (71.39%), The amount of bacteria adsorbed was also the highest, indicating that copper leaching rate was positively correlated with the amount of bacteria adsorbed on the mineral surface.