Bioleaching of chalcocite by mixed microorganisms subjected to mutation

Mixed microorganisms with elevated activity of chalcocite-leaching were screened by mutation methods. The original microorganisms collected from acid mine drainage of different sites were mixed and then treated with mutagens NO₂⁻, diethyl sulfate (DES), UV and their combinations, respectively. Five groups of mixed microorganisms with much stronger ore-leaching ability were obtained by screening on the leaching media. Among them, group E of mixed microorganisms (treated with 1% DES for 60 min) with the best performance on chalcocite-leaching, increases the content of Cu²⁺ by 101.4% in 20 d of leaching compared with the control culture. In addition, group E is more tolerant to Cu²⁺ in media than the control without mutation treatment. Analysis for the diversity of microbial clones indicates that half of operational taxonomic units (OTUs) in group E are Acidithiobacillus ferrooxidans. These observations suggest that group E might have potentials for industrial application. Foundation item: Project(50321402) supported by the National Natural Science Foundation of China; Project(2004CB619201) supported by the Major State Basic Research and Development Program of China     

某复杂铜硫矿浮选分离与综合回收试验研究

某复杂铜硫矿原矿硫铁含量高,现场为高碱工艺流程,铜硫分离困难且金银综合回收效率低。采用硫化钠预先活化,"石灰+羧化壳聚糖"作黄铁矿和磁黄铁矿抑制剂,粗选pH=8.5,经一粗两精三扫优先浮选流程可得到含铜24.63%、含金3.41 g/t、含银952.05 g/t,铜回收率84.45%、金回收率32.58%、银回收率75.70%的铜精矿。羧化壳聚糖为清洁高效有机高分子化合物,能高效选择性抑制硫铁矿,在提高主金属铜回收率的同时,伴生金银矿物得到了高效综合回收。     

用酸性乙腈-硫酸铜体系从辉铜矿中浸出铜

研究了用酸性乙腈-硫酸铜体系从辉铜矿中提取铜。试验结果表明，当温度为53～54℃、盐酸体积分数为10％、乙腈体积分数为60％、Cu(Ⅱ)的量稍大于矿样中的含铜量时，仅需2h，铜浸出率可达95％。     

不同氧化剂对Cu2S、Ni3S2矿浮选行为的影响

为了详细研究Cu2S、Ni2S2矿在氧化气氛中的浮选行为，分别就高锰酸钾、重铬酸钾作氧化剂时，对Ni3S2矿和Cu2S矿浮选行为的影响进行了研究，从而找出其变化规律。     

多组分捕收剂对辉铜矿的协同效应

为研究多组分捕收剂XK?103对辉铜矿的捕收性能,对比了XK?103和Z?200在不同矿浆pH值、药剂用量条件下浮选辉铜矿和黄铁矿单矿物的效果,发现XK?103对辉铜矿有良好的捕收性能;通过Zeta电位分析、X射线光电子能谱分析和TOC总碳分析仪研究了XK?103和Z?200在辉铜矿表面的吸附情况,发现XK?103在辉...     

福建紫金矿业股份有限公司硫化铜矿生物堆浸过程

针对紫金山铜矿的特点 ,进行生物堆浸提铜工业试验研究。结果表明 ,紫金山铜矿生物堆浸效果良好 ,不同浸矿堆累计浸出时间 10 0 0h ,浸出率在 40 %～ 60 % ,浸出半年 ,浸出率达 80 %以上。次生硫化铜矿物的生物堆浸具有两个阶段 ,在浸出前一阶段 ,浸出速率较快 ,而浸出第二阶段浸出速率较慢。随着浸出的进行 ,浸出液 pH连续下降 ,溶液电位逐步升高。微生物的存在加速堆中Fe2 氧化使溶液电位上升 ,同时氧化中间过程的产物元素硫 ,从而加速硫化矿的氧化溶解。     

某铜硫多金属矿选矿试验研究

针对某铜硫多金属矿开展了工艺矿物学研究,并在其基础上进行了详细的选矿试验研究,采用高效铜捕收剂BK322以及高效环保硫抑制剂BK526进行试验,优先选铜,然后选硫。闭路试验指标为铜精矿铜品位20.94%、铜回收率80.45%,硫精矿硫品位45.57%、硫回收率90.30%。     

The Mount Isa Mines limited copper solvent extraction and electrowinning plant

This paper describes the development, engineering and initial operation of a relocatable 10 tonne per day copper solvent extraction and electrowinning plant. Plant design incorporates Krebs mixer-settlers, Dremco and Copper Refineries cell house ideas and various innovative engineering solutions. Use is made of up to date process control systems, giving a minimum of plant manning. Plant performance meets or exceeds design requirements for throughput and product quality. Significant modifications have been made to the chalcocite heap leaching system to raise copper dissolution rates. These are described together with plant performance data from the first 18 months of operation.     

辉铜矿氨法制铜盐工艺研究

本文研究了用含有活性剂的碳氨液从辉铜矿中浸取铜。经反复对比试验,筛选出含活性剂的碳氨液能有效地浸出辉铜矿中的铜,可望替代目前严重污染环境的干法取铜工艺。     

辉铜矿湿法冶金新工艺

针对辉铜矿含铜高、含硫低等特点,采用巴西辉铜矿进行了详细的试验研究,开发了一种湿法冶金新工艺,采用常压、加压联合流程直接生产阴极铜,铜总浸出率大于99%,回收率大于98%.