中文摘要：

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15 d后,体系氧化还原电位便可由381 mV升高到588 mV左右,Fe^2＋氧化率达到98.49%,体系pH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,Fe^2＋氧化率下降,铝离子浓度为20 g·L^-1时,浸出45 d后,体系氧化还原电位仅为400 mV左右,Fe^2＋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。

英文摘要：

The research object of this paper was acidophilic bioleaching bacteria（Acidthiobacillus ferrooxidans,At. f）. The effect of Al^2＋concentration on the oxidation activity,adsorptive bacteria amount and the copper leaching rate was investigated. The relationships among these factors were also studied. The results indicated that the bacterial oxidation activity was significantly affected by Al^2＋concentration from 0 - 20 g·L^-1. The bacterial oxidation activity was best when Al^2＋concentration was 1 g·L^-1. After leaching 15 d,the oxidation-reduction potential（Eh） value increased from 381 to 588 mV,the Fe^2＋oxidation rate could reach 98. 49%,and the pH value dropped from 2. 11 to 1. 44. However,when Al^2＋concentration was more than 1 g·L^-1,the bacterial oxidation activity further decreased and Fe^2＋oxidation rate also decreased. When Al^2＋concentration was 20 g·L^-1,the Ehvalue was only 400 mV and the Fe^2＋oxidation rate was only 40% after leaching 45 d. The amount of adsorptive bacteria and the copper leaching rate in the leaching system all increased at first and then decreased with the increasing of Al^2＋concentration. The copper leaching rate was the highest,up to71. 39%,and the amount of adsorptive bacteria was also the highest when Al^2＋concentration was 15 g·L^-1,which indicated that the copper leaching rate was positively associated with the amount of adsorptive bacteria on the surface of chalcopyrite.