活性碳催化低品位原生硫化铜矿石细菌浸出的效应  

Catalytic Effect of Active Carbon on Low-Grade Copper Sulfide Ore

作　　者：张卫民[1] 谷士飞 孙占学[1] 

机构地区：[1]东华理工学院 [2]广西壮族自治区地质环境总站

出　　处：《金属矿山》2007年第9期68-70,共3页Metal Mine

摘　　要：为了提高用氧化亚铁硫杆菌和氧化硫硫杆菌混合菌对低品位原生硫化铜矿石细菌浸出的效果,通过试验,研究了活性碳的催化效应。结果表明,在细菌浸出的初始阶段,添加活性碳可以大大加快铜的浸出速度和提高铜的浸出率。其中添加初始活性碳浓度为3.0g/L时,最有利于铜的浸出,在600h内铜的浸出率可以从11%增加到79%,比不添加活性碳时提高了68个百分点。添加初始活性碳加快细菌浸铜速度和提高铜浸出率的原因是由于活性碳与黄铜矿之间形成了电池反应。添加初始活性碳使矿石中铁的浸出和溶液中二价铁的细菌氧化明显受到抑制。当有活性碳存在时,低品位原生硫化铜矿石在低氧化还原电位下比高氧化还原电位更有利于铜的浸出。The catalytic effect of adding active carbon on improving the efficiency of the bioleaching of low-grade primary copper sulfide ore using mixed thiobacillus ferrooxidans and thiobacillus thiooxidans was investigated. The results show that, in the initial stage of bioleaching, active carbonated addition can greatly accelerate the copper dissolution velocity and rate, where a dosage of 3.0g/L of active carbon is most beneficial to the copper dissolution, which is increased from 11% to 79% after 600h bioleaching, an increase of 68 percentage points compared to that in the absence of active carbon. The enhanced dissolution velocity and rate of copper can be attributed to the galvanic interaction between active carbon and chalcopyrite. The addition of activated carbon can obviously depress the iron dissolution and the bacterial oxidation of Fe^2＋ in solution. At the presence of active carbon, a low redox potential is more favorable to the copper dissolution than a high one for low-grade primary copper sulfide ores.

关 键 词：细菌浸出 低品位原生硫化铜矿石 活性碳 催化效应 

分 类 号：TD952.1[矿业工程—选矿]