Degradation of Lix984N and its effect on interfacial emulsion

1 INTRODUCTION Interfacial cruds are supposed to be one of the commonest and most troublesome problems emerging out in practice of copper solvent extraction. Generally, interfacial cruds are inhomogeneous oil/water emulsions that consist of organic phase, aqueous phase and solid particles. It can lead to a lot of detrimental effects on plant operations including difficult phase disengagement, contaminated electrolytes, extractant loss, declined product quality and polluted environment. Lo…     

微细粒高岭石在水介质中的聚团行为

通过采用沉降法以及颗粒表面动电位测试，考察了水介质中PH的变化以及阳离子表面活性剂对微细粒高岭石颗粒聚团行为的影响．结果表明：pH〈7时，水介质中高岭石颗粒表现为强烈的聚团行为；pH〉9时，主要以分散为主．阳离子型表面活性剂的加入使颗粒表面动电位增大，显著提高了高岭石的聚团效果．随表面活性剂浓度的增大，高岭石的聚团行为更加显著．pH=7时，烷基伯胺醋酸盐随着碳链的增长，对高岭石的聚团效果减弱；同一浓度下季胺盐的聚团效果优于烷基伯胺盐．     

Electrochemical flotation of diethyldithiocarbamate-pyrrhotite system

Using sodium diethyldithiocarbamate as a collector the flotation behavior of pyrrhotite was investigated.The relationship between potential and pH range for pyrrhotite flotation was established. The results show that the flotation of pyrrhotite is dependent on pulp potential at certain pH values. Pyrrhotite has good floatability from pH 2 to pH 12, and poor flotability at pH＞12. Cyclic voltammetry and Fourier transform infrared spectrum analysis show that the major adsorption product of DDTC on pyrrhotite is tetraethylthiuram disulfide. The intensity of Fourier transform infrared signals of tetraethylthiuram disulfide adsorbed on pyrrhotite and the anode current of a pyrrhotite electrode and flotation response of pyrrhotite are correlated with pulp potentials.     

Synthesis of γ-alkoxy-propylamines and their collecting properties on aluminosilicate minerals

1　INTRODUCTIONBayerprocessiswidelyusedtotreatthebauxitewithmoleratioofAl2 O3toSiO2 (n (Al) /n (Si) )morethan 8.AlthoughthereareabundantbauxiteresourcesinChina ,mostofthemarediasporicbaux itewithhighaluminumcontent ,butlown(Al) /n(Si) ,usually 5 8[1] .ThistypeofbauxiteisdifficulttobetreateddirectlybytheBayerprocess .Itisthereforehighlydesirabletoincreasen(Al) /n(Si)ofbauxitebyphysicalcleaning[2 ] .Forthisreason ,flotationdesilicate Bayerprocesswasdeveloped[3] .Flotationdesilicationc…     

Corrosive electrochemistry of j amesonite by cyclic voltammetry

The corrosive electrochemistry of jamesonite was studied by cyclic voltammetry. Every peak in voltammograms was identified through thermodynamic calculation. The results show an irreversible electrode process by the strong adsorption of oxidation elemental sulfur on jamesonite. A deficient-metal and sulfur-rich compound is formed under the potential of 80 mV at pH 6.86. The passive action by elemental sulfur occurs from 80 to 470 mVand S2O3^2-, SO4^2- are produced at potential over 470 mV. The anodic peak producing SOz- is inhibited due to the deposition of PbSO4 at higher potential in Na2SO4 solution. The corrosive action of jamesonite becomes strong and the redox characterization similar to PbS, FeS and Sb2S3 appears at pH 9.18.     

Growth kinetics of Thiobacillus ferrooxidans in bioelectrochemical cell

Thiobacillus ferrooxidans might be the most important bacteria used in biometallurgy. The foundation way of its growth process is oxidizing ferrous in order to obtain energy needed for metabolism, but the variation of ferrous concentration and mixed potential of the culture media would have crucial effect on the bacteria growth.Based on the characteristics of Thiobacillus ferrooxidans growth and redox potential of ferric and ferrous, an electrochemical cell was designed conventionally to study growth rule and the relationship between redox potential and bacteria growth was built up, and some growth kinetics of Thiobacillus ferrooxidans were elucidated. It demonstrates that the variation of open potential of electrochemical cell ΔE shows the growth tendency of Thiobacillus ferrooxidans, at the initial growth stage, the value of ΔE increases slowly, when at logistic growth stage, it increases drastically, and the growth rate of bacteria is linear with the oxidation rate of ferrous. The bacteria growth kinetics model is proposed using Monod and Michealis-Menten equation, and the kinetics parameters are got. The consistence of the measured and the calculated results proves that it is proper to use the proposed kinetics model and the electrochemical cell method to describe the growth rule of Thiobacillus ferrooxidans.     

铅锌混合精矿生产理论工艺指标计算方法探讨

主要介绍了铅锌混合精矿生产所遇到的理论工艺指标计算问题，列举了按现有一般方法计算铅锌混合精矿生产理论工艺指标不符实际的现象，提出了一种行之有效且比较符合实际情况的计算方法。     

矿物材料化学加工与合成的研究现状和发展方向

从以矿物原料直接制备矿物材料、矿物材料的化学改性、特殊功能粉体的合成及粉体材料合成中新技术手段的应用等方面,论述了矿物粉体材料的研究进展。聚合物/黏土纳米复合材料,由于其特殊的功能,成为矿物材料改性的新方向;特殊功能粉体赋予材料许多优越的性能,其开发和研究已成为热点,特别是在电池材料、抛光材料、生物材料的研究方面;学科交叉为材料研制带来了又一次兴起,超声波、机械化学、微波和微波等离子体,由于其特殊的功效,解决了粉体制备过程中许多难题。新方法和技术所制得材料具有优越性能和特殊功能。     

弱碱性抛光液中铜化学机械抛光的电化学行为

在弱碱性介质里以铁氰化钾为钝化剂,对铜化学机械抛光技术（CMP）过程中的电化学行为进行了在线测试,考察了铜在无铁氰化钾存在下的极化行为及铁氰化钾浓度对腐蚀电位的影响,研究了在不同压力下铜抛光前后的腐蚀电位（φE）和腐蚀电流密度（JC）的变化规律,比较了抛光前及抛光过程中铜极化曲线的变化。定性地通过成膜的快慢及抛光过程中腐蚀电流密度的大小来说明抛光速率的高低,证明了以弱碱性溶液为介质,铁氰化钾为成膜剂,纳米γ-Al2O3为磨粒的CMP配方的可行性。     

铝土矿反浮选体系分散与凝聚理论

在铝土矿反浮选脱硅过程中,矿浆悬浮液的分散和凝聚状态对微细粒－水硬铝石的回收和精矿铝硅比有显著影响。要使各种硅酸盐矿物混合物达到有效的选择性分离,首先必需使矿浆悬浮液处于最佳分散状态,避免各种矿物细粒间的相互混杂和矿泥罩盖。针对高硅铝土矿反浮选脱硅过程,根据经典DLVO理论,从颗粒间的相互作用分析了微细粒－水硬铝石在各种含硅脉石矿物表面的粘附情况。结果表明：一水硬铝石与含硅脉石矿物颗粒间的范德化相互作用总是吸引;而它们间的静电相互作用在弱碱性条件下时为排斥,在弱酸性条件下时为吸引,一水硬铝石的夹带上浮较为严重,不利于铝土矿的反浮选。