氯化物浸出黄铜矿的试验研究

研究了硝酸催化氧化、氯化物浸出黄铜矿的机理，考察了氧化和浸出反应的影响因素。研究结果表明：硝酸催化氧化的优化条件是酸度。0．50mol／L、温度95℃、硝酸量0．5％～1．0％。采用浸出、氧化分离式新工艺，4．5h铜的浸出率达97％，氧化除铁率97％，可实现黄铜矿浸出的综合优化。     

MnGeP2 Thin Films Grown by Molecular Beam Epitaxy

Growth conditions for MnGeP₂ thin films have been investigated by using molecular beam epitaxy (MBE) method. Mn and Ge were evaporated by K-cells, and P₂ was supplied by decomposing tertialybutylphosphine (TBP). GaAs (001) and InP (001) single crystals were used as substrates. An X-ray diffraction peak, which can be assigned to (008) peak of MnGeP₂, was observed at nearly the same position as the (004) peak of GaAs. The lattice constant of the MnGeP₂ thin film was determined to be 1.13 nm assuming its crystal structure is a c-axis oriented chalcopyrite type structure. Secondary phases such as GeP, MnGe_x and MnP were observed for beam fluxes of Mn and Ge as high as 1×10^–8 Torr.     

黄铜矿与斑铜矿在酸性细菌培养基中的电化学溶解对比(英文)

采用电化学测试和X射线光电子能谱(XPS)测试分析黄铜矿与斑铜矿在酸性细菌培养基中的电化学溶解过程。斑铜矿直接氧化反应比还原反应更容易发生,但黄铜矿既难被氧化,又难被还原。斑铜矿具有更高的氧化速率,从而比黄铜矿更容易被溶解。铜蓝(CuS)是黄铜矿与斑铜矿溶解过程的中间产物。因此,斑铜矿的溶解途径主要为直接氧化过程,中间产物铜蓝(CuS)可能限制其进一步溶解。黄铜矿的溶解途径包含了还原-氧化过程,其中,黄铜矿首先被还原为与斑铜矿类似的中间产物,再进一步被氧化,并产生铜蓝(CuS),而黄铜矿的最初还原过程是其溶解过程的主要限制步骤。     

Interfacial reactions of chalcopyrite in ammonia–ammonium chloride solution

The interfacial reactions of chalcopyrite in ammonia–ammonium chloride solution were investigated. The chalcopyrite surface was examined by scanning electron microscopy and X-ray photoelectron spectroscopy (XPS) techniques. It was found that interfacial passivation layers of chalcopyrite were formed from an iron oxide layer on top of a copper sulfide layer overlaying the bulk chalcopyrite, whereas CuFe_1–xS₂ or copper sulfides were formed via the preferential dissolution of Fe. The copper sulfide layer formed a new passivation layer, whereas the iron oxide layer peeled off spontaneously and partially from the chalcopyrite surface. The state of the copper sulfide layer was discussed after being deduced from the appearance of S^2–, S^2?₂, S^2?_n, S⁰ and SO^2?₄. A mechanism for the oxidation and passivation of chalcopyrite under different pH values and redox potentials was proposed. Accordingly, a model of the interfacial reaction on the chalcopyrite surface was constructed using a three-step reaction pathway, which demonstrated the formation and transformation of passivation layers under the present experimental conditions.     

甘肃某铜矿选矿新药剂应用研究

甘肃某铜矿为单一含铜浸染状黄铁矿石,研究结果表明,部分呈单体解离状态的细粒级铜矿物和黄铜矿富连生体进入尾矿是导致铜矿物损失的主要原因。通过试验研究,在不改变现场生产流程的情况下,采用捕收能力较强的新型药剂D60为捕收剂,小型试验和矿浆样验证试验均取得了良好的技术指标,新药剂方案铜回收率较现场药剂方案铜回收率均提高1%以上,可有效提高铜回收率。      

综合回收锌矿石中伴生低品位铜铅工艺研究

某锌矿石中伴生有铜、铅等矿物,其中锌品位为3.29%、铅品位为0.084%、铜品位为0.11%,为原生硫化矿石。根据矿石性质采用铜铅混合浮选—铜铅分离—锌浮选的工艺流程,进行了小型试验和工业试验,采用BK510抑铜浮铅工艺,工业试验指标与原重铬酸钾工艺流程指标比较,铅精矿品位由38.08%提高到60.59%,铅回收率由30%提高到45.20%,铜精矿品位由20%提高到21.43%,铜回收率由34%提高到40.04%,获得可观的经济效益。     

Electrochemical flotation separation of chalcopyrite from molybdenite by CM Eh control

1　ＩＮＴＲＯＤＵＣＴＩＯＮＭｏｌｙｂｄｅｎｉｔｅｉｓｏｆｇｏｏｄｎａｔｕｒａｌｆｌｏａｔａｂｉｌｉｔｙ ,ａｎｄｉｓｎｏｔｄｅｐｒｅｓｓｅｄｉｎａｗｉｄｅｐｏｔｅｎｔｉａｌｒａｎｇｅ (- 1.2～1.4Ｖ) [1] .Ｏｎｔｈｅｏｔｈｅｒｓｉｄｅ ,ｔｈｅｆｌｏａｔａｂｉｌｉｔｙｏｆｃｈａｌ ｃｏｐｙｒｉｔｅｉｓｄｅｃｒｅａｓｅｄｑｕｉｃｋｌｙａｔａｐｒｏｐｅｒｒｅｄｕｃｔｉｖｅｐｏ ｔｅｎｔｉａｌ.Ｔｈｅｒｅｆｏｒｅ ,ａｔｌｏｗｐｏｔｅｎｔｉａｌ,ｃｈａｌｃｏｐｙｒｉｔｅｃａｎｂｅｄｅｐｒｅｓｓｅｄａｎｄｍｏｌｙｂ…     

细菌的氧化生理与其浸矿机理研究

对不同氧化生理的诱导菌、S^2-氧化缺陷型菌株和Fe^2 氧化活性抑制菌进行了黄铜矿浸出研究，表明黄铜矿的细菌浸出以氧化其S^2-的直接作用为主。     

Influence of sodium thiosulphate on oxidation of sulphide minerals during selective flotation of copper-nickel ores

The studies of sulphur distribution in oxidation products of pyrrhotite and chalcopyrite being components of Cu-Ni ores showed that the elementary sulphur — sulphoxide ion ratio on the mineral surface and in the liquid phase of mineral suspensions changes in the presence of sodium thiosulphate. Sodium thiosulphate exhibits properties of a reducing agent and prevents formation of hydrophobic elementary sulphur on pyrrhotite surface due to oxygen absorption and oxidation of thiosulphate-ions to sulphates. The decrease in pyrrhotite floatability is observed, and more favorable conditions are provided for selective flotation of chalcopyrite on copper-nickel ore processing. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 89–94, July–August, 2006.     

黄铜矿自诱导浮选的研究

本文给出了pH0～12时,黄铜矿无硫化钠无捕收剂浮选(即自诱导浮选)的可浮区和不可浮区。热力学计算表明了可浮区的意义。用热力学计算、电位测量和伏安曲线研究了自诱导浮选疏水体产生机理;表面溶剂提取一化学分析技术建立了黄铜矿表面疏水/亲水平衡关系。研究结果表明,中性硫(S~0)是主要疏水体,其产生和提取量受电位控制。