Effect of Cu~(2+)ions on bioleaching of marmatite

The effect of Cu~(2+)ions on bioleaching of marmatite was investigated through shake leaching experiments.The bacteria inoculated are a mixed culture ofAcidithiobacillus ferrooxidans,Acidithiobacillus thiooxidans and Lepthospirillum ferrooxidans.The results show that zinc is selectively leached,and the addition of appropriate content of Cu~(2+)ions has positive effect on the bioleaching of marmatite.SEM and EDX analyses of the leaching residue reveal that a product layer composed of iron sulfide, element...     

黄原酸钾盐介质中黄铁矿的电化学行为Ⅱ:疏水性产物双黄药的吸附及其稳定性研究

利用恒电位和恒电流的电化学研究方法 ,研究了黄原酸钾溶液中黄铁矿表面的电化学行为。研究表明 ,随着pH值提高 ,电极表面的双黄药吸附层变薄 ;双黄药在黄铁矿电极表面的还原动力学方程式表明 ,高碱条件下 (pH=11.0) ,双黄药易于还原解离。     

六方磁黄铁矿浮选行为及其表面吸附机理

通过丁铵黑药药剂用量及矿浆pH对未活化和活化六方磁黄铁矿浮选试验,以及六方磁黄铁矿表面ζ电位及红外光谱测定,研究丁铵黑药体系下,六方磁黄铁矿的浮选行为及其表面吸附机理。结果表明,六方磁黄铁矿表面在中性条件下可浮性最好。Cu2+在碱性条件下,对其才有一定的活化效果。丁铵黑药在六方磁黄铁矿表面为化学吸附,表面可能形成正二丁基二磷酸亚铁。     

细粒锡石浮选研究

对蒙自矿冶有限责任公司白牛厂矿区铅锌浮选流程中的磁选尾矿进行了浮锡研究。以BY-9为捕收剂, P86为辅助捕收剂, BY-5和碳酸钠为脉石抑制剂, 一次浮锡可获得锡品位8.56%,回收率61.61%的锡粗精矿,锡粗精矿再浮, 锡精矿锡品位达到53.58%,作业回收率81.35%; 尾矿锡品位1.84%, 回收率18.65%。两次浮锡获得高品位锡精矿锡总回收率50.12%,尾矿锡回收率11.49%。     

从硫酸锌溶液中萃取锌的试验研究

研究了用D2EHPA从含锌浸出液中萃取锌.结果表明,以皂化后的体积分数为20%的D2EHPA钠盐作萃取剂,260号溶剂油作稀释剂,在相比(V0/Va)为3∶2,料液初始pH为2.0,搅拌强度200 r/min,萃取时间10 min条件下从锌质量浓度18 g/L的浸出液中萃取锌,静置分层10 min后,锌的单级萃取率达72.81%.用180 g/L硫酸进行反萃取,锌的反萃取率为88.67%,可以实现锌、铁分离.     

硫酸锌和二甲基二硫代氨基甲酸钠在铅锌浮选体系中对闪锌矿的协同抑制机理（英文）

通过浮选试验、离子络合测试、接触角测试和XPS分析,研究组合抑制剂硫酸锌(ZnSO₄)和二甲基二硫代氨基甲酸钠(DMDC)对闪锌矿的抑制机理。浮选试验表明,与单一抑制剂ZnSO₄和DMDC相比,组合抑制剂ZnSO₄+DMDC对闪锌矿有更好的选择性抑制效果。离子络合试验表明,DMDC对铅离子或其羟基络合物有很强的络合能力。接触角测试证明,与单一抑制剂ZnSO₄和DMDC相比,组合抑制剂ZnSO₄+DMDC使闪锌矿表面更加亲水。XPS分析表明,组合抑制剂通过竞争吸附阻止捕收剂在铅离子活化后的闪锌矿表面吸附,而在方铅矿表面,组合抑制剂与捕收剂产生共吸附。     

我国金属矿山废石资源化综合利用现状与发展

随着社会的发展,我国对矿产资源的需求日益增加,矿山废石的大量堆积不仅造成矿产资源的严重浪费,而且占据大量土地,还会带来严重的安全问题和环境污染.针对我国矿山废石堆存量大、增长快、废石种类及成分复杂、废石资源化综合利用率低等特点,本文总结了矿山废石的危害和现行的处理及利用方式,详述矿山废石用于回收有价金属及进一步的废石回...     

硫化铜矿诱导浮选及其机理的研究

本文详细地考察了黄铁矿的诱导浮选行为。研究表明，黄铜矿具有良好的自诱导可浮性；黄铁矿的自诱导可浮性很关，但在合适的硫化钠用量条件下，具有良好的硫诱导可浮性。与捕收剂诱导浮选相比，自诱导使铜硫分选的ＰＨ区域增宽。以此为依据可提出了铜硫浮选分离分离的新方案设计。     

Bioleaching of marmatite in high concentration of iron

Bioleaching of marmatite with a culture of Thiobacillus ferrooxidans and Thiobacillus thiooxidans in high concentration of iron was studied,the results show that the zine leaching rate of the mixed culture is faster than that of the sole Thiobacillus ferrooxidans,the increasing iron concentration in leaching solution enhances the zine leaching rate.The SEM analysis indicates that the chemical leaching residues is covered with porous solid layer of elemental sulfur,while elemental sulfur is not found in the bacterial leaching residues.The primary role of bacteria in bioleaching of sphalerite is to oxidize the chemical leaching products of ferrous ion and elemental sulfur,thus the indirect mechanism prevails in the bioleaching of marmatite.     

Bioleaching of sphalerite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans cultured in 9K medium modified with pyrrhotite

Elective culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in 9K medium modified with pyrrhotite was studied. Bioleaching of flotation concentrate of sphalerite by the selected bacteria was carried out. The results show that the microorganisms cultured by pyrrhotite are a mixture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, of which the capability to oxidize ferrous to ferric irons is enhanced by the high mass ratio of Fe to S in pyrrhotite. Three pyrrhotite samples were separated into various parts with corresponding S/Fe ratios by magnetic separation and were used to culture the elective bacteria as the substrate. The association of the cultures could provide a more rapid and complete oxidation of sphalerite than that of bacteria cultivated by conventional methods.