Cooperative effect of chalcopyrite and bornite interactions during bioleaching by mixed moderately thermophilic culture

The cooperative interactions between chalcopyrite and bornite during bioleaching by mixed moderately thermophilic culture were investigated mainly by bioleaching experiments and electrochemical experiments. Bioleaching results showed that a cooperative effect existed between chalcopyrite and bornite. When the mass ratio of chalcopyrite to bornite was 3:1, an extremely high copper extraction of more than 88% was achieved after bioleaching for 27 days. One of the major reasons for the cooperative effect was that a certain redox potential range (370–450 mV vs. Ag/AgCl) could be maintained for a long period of time during bioleaching due to the mixture of chalcopyrite and bornite. Electrochemical measurements revealed that chalcopyrite was much easier to be reduced than oxidized, while bornite was prone to be directly oxidized. Hence, galvanic effect between chalcopyrite and bornite enhanced the reduction of chalcopyrite to secondary copper-iron species and promoted the oxidative dissolution of bornite. Therefore, redox potential controlling and galvanic effect both contributed to the cooperative bioleaching of chalcopyrite and bornite.     

斑铜工艺品图像检索技术及系统的研究

通过对云南斑铜工艺品图像特征的分析,提出了基于距离分布直方图和Hu形状不变矩的组合检索算法,并引入了基于权值调整的相关反馈技术对检索结果进行修正.对实验结果的分析表明,该技术可以有效地进行斑铜工艺品图像的检索,对斑铜工艺品辅助设计具有较强的应用价值.     

刚果（金）某细粒复杂铜矿石浮选试验

刚果（金）某细粒复杂铜矿石铜品位为2.69%,主要铜矿物为斑铜矿,大部分以细粒及微细粒不规则状嵌生在脉石矿物中,黄铜矿、孔雀石少量。矿石中次生硫化铜、原生硫化铜和氧化铜分别占总铜的76.21%、13.38%和7.43%。为确定该矿石资源的高效开发利用方案,进行了选矿试验。研究结果表明,矿石在磨矿细度为-0.074 mm占85.86%的情况下,以BKD-1为捕收剂、Na₂S为氧化铜矿物的活化剂、碳酸钠为矿浆pH调整剂,采用3粗2精2扫、扫选精矿合并1次扫精选流程处理,获得了铜品位为38.52%、铜回收率为97.52%的铜精矿。