Influences of collector DLZ on chalcopyrite and pyrite flotation

The interaction mechanism of collector DLZ in the flotation process of chalcopyrite and pyrite was investigated through flotation experiments, zeta potential measurements and infrared spectrum analysis. Flotation test results indicate that DLZ is the selective collector of chalcopyrite. Especially, the recovery of chalcopyrite is higher than 90% in neutral and weak alkaline systems, while the recovery of pyrite is less than 10%. When using CaO as pH regulator, at pH=7-11, the floatability of pyrite is depressed and the recovery is less than 5%. Zeta potential analysis shows that the zeta potential of chalcopyrite decreases more obviously than that of pyrite after interaction with DLZ, confirming that collector DLZ shows selectivity to chalcopyrite and pyrite. And FT1R results reveal that the flotation selectivity of collector DLZ is due to chemical absorption onto chalcopyrite surface and only physical absorption onto pyrite surface.     

Kinetics of chemical leaching of chalcopyrite from low grade copper ore: behavior of different size fractions

The kinetics of the chemical leaching of copper from low grade ore in ferric sulfate media was investigated using the constrained least square optimization technique.The experiments were carried out for different particle sizes in both the reactor and column at constant oxidation-reduction potential (Eh),pH values,and temperature.The main copper mineral was chalcopyrite.About 40％ of Cu recovery is obtained after 7 d of reactor leaching at 85℃ using -0.5 mm size fraction,while the same recovery is obtained at 75℃ after 24 d.Also,about 23％ of Cu recovery is obtained after 60 d of column leaching for +4-8 mm size fraction whereas the Cu recovery is as low as about 15％ for +8-12.7 and +12.7-25 mm size fractions.A 4-stage model for chalcopyrite dissolution was used to explain the observed dissolution behaviors.The results show that thick over-layers of sulphur components cause the parabolic behavior of chalcopyrite dissolution and the precipitation of Fe3+ plays the main role in chalcopyrite passivation.In the case of coarse particles,transformation from one stage to another takes a longer time,thus only two stages including the initial reaction on fresh surfaces and S0 deposition are observed.     

脂类捕收剂DLZ对黄铜矿和黄铁矿浮选的选择性作用

通过浮选实验、吸附量和红外光谱测定,考察了捕收剂DLZ对黄铜矿和黄铁矿浮选性能的影响及作用机理.结果表明:DLZ在pH=2.7～12.05时对黄铜矿的捕收能力强,最大回收率95.7%,而对黄铁矿的捕收能力弱,且PH=6.9～12.05时其回收率小于10%.用CaO作pH调整剂时,在pH=7～11时黄铜矿的回收率与用NaOH调PH相差不大,但黄铁矿可浮性被抑制,回收率低于5%.DLZ在黄铜矿上的吸附量比在黄铁矿上的大,特别是强碱条件下;其吸附量随用量的增加而增大.DLZ与矿物作用的红外光谱分析表明:黄铜矿与DLZ作用后出现了DLZ的相关特征吸收峰,而黄铁矿与DLZ以及Cu~(2+)作用前后的红外光谱曲线基本没有变化,可见DLZ在黄铜矿表面的吸附属于化学吸附,在黄铁矿表面的吸附属于物理吸附.     

CuInTe2 and In-rich telluride chalcopyrites thin films obtained by electrodeposition techniques

In order to obtain single-phase thin films of the system Cu–In–Te with optoelectronic properties adequate for solar cells, electrodeposition techniques were used on substrates of molybdenum supported by glass. Different annealings in Te atmosphere have been done that affect the Te concentration and In/Cu atomic ratio. Single chalcopyrite phase appears in two ranges of composition where the In/Cu atomic ratio varies between 0.21–0.76 and 0.90–3.46, respectively. Morphology, cell lattice parameters and electrical resistance for single-phase samples depend strongly on the composition in the annealed samples. The cell parameters ranges are a=6.141–6.183 Å and c=12.201–12.375 Å.     

硫化铜精矿氧压浸出回收电积铜的工艺研究

介绍了几种硫化铜精矿的加压湿法炼铜技术,对于氧化铜矿少的地区,由于一段氧压浸出终酸较高,后续工序的降酸过程复杂,渣带走铜损失大,该工艺有一定局限。两段逆流氧压浸出虽然较好的解决了降酸的问题,但是两段氧压浸出需要采用两个高压釜,设备投资较高,操作更复杂。硫化铜精矿控温氧压平行浸出回收电积铜的工艺在高压釜中段部位增加一个进料口,两个进料口分别加入磨细的精矿矿浆,通过控制前后段不同的浸出温度,同时实现了浸铜和除铁降酸的目的,节省了设备投资。     

Electrochemical Investigation of Chalcopyrite Oxidation in Alkaline Solutions

Electrochemical oxidation of chalcopyrite (CuFeS₂) was investigated as an attempt to gain a better understanding of its surface oxidation chemistry in alkaline solutions. Rest potential measurements, cyclic voltammetry and chronoamperometry experiments were conducted in the pH range of 7 to 13 to determine the influence of pH, immersion time, and applied potential on the mineral oxidation state. Rest potential was found to increase by immersion time and oxygen content of the solution and decrease by the pH value. Cyclic voltammetry experiments revealed that the mineral oxidation occurs in three stages. Increase of the pH value caused the peaks to shift to lower potentials. The results were confirmed by chronoamperometry experiments.     

Simultaneous electrogenerative leaching of chalcopyrite concentrate and MnO_2

1INTRODUCTION Electrogenerativeleachingprocessisanew fieldinhydrometallurgy.Inordertoutilizethe chemicalenergyinleachingprocessreasonablyand simplifythepurifyingprocess,WANGetal[17]completedexperimentalstudiesofelectrogenerative leachingsulfideminerals.Recently,someveryin terestingstudieshavebeenreportedpertainingto leachingofaseriesofMnO2sulfidemineralcou plesinacidmedium,suchasMnO2CuFeS2[8,9],MnO2ZnS[1012],MnO2FeS2[1315].Inthesecases,theextentofdissolutionofMnO2andsulfidemin era…     

有机抑制剂CTP与黄铁矿,黄铜矿的作用机理

采用接触角测定、动电位测定、吸附量测定及紫外光谱等多种手段研究了不同碱性介质中ＣＴＰ与矿物表面的作用机理。结果表明ＣＴＰ阴离子与黄铁矿表面发生化学吸附,而与黄铜矿表面作用较弱;在混合精矿体系中,ＣＴＰ在选择性吸附于黄铁矿表面的同时解吸了矿物表面的黄药。在钙离子存在条件下,ＣＴＰ与黄铁矿和黄铜矿作用差距变大。     

过硫酸铵在硫化铜钼矿分离中的应用及机理

针对传统黄铜矿抑制剂存在的污染环境、药剂消耗量大等问题,开发新的抑制方式以实现铜钼有效分离极为重要.本文通过单矿物与混合矿浮选试验研究了过硫酸铵(APS)氧化对黄铜矿和辉钼矿可浮性及铜钼分离性能的影响,并通过Zeta电位、拉曼光谱与X射线光电子能谱(XPS)探讨了其抑制机理.浮选结果表明:APS可以显著地降低黄铜矿的回...