金粉的电化学调控浮选实验室研究

用改进的挂槽式研究了纯金粉在不同条件下的可浮性，重点考查了电位对金粉可浮性的影响，得到了最佳的浮选条件：电位ψ＝０－０．４Ｖ（ＳＨＥ），ＰＨ＝９．０和「Ｎａ２Ｓ」＝１０＾－４－－１０＾－５ｍｏｌ／Ｌ。实验结果表明，纯金粉也具有较好的硫诱导电化学调控可浮性。     

阳离子表面活性剂在一水硬铝石表面吸附研究

采用荧光探针法研究了在烷基伯胺和季铵盐阳离子表面活性剂在一水硬铝石表面吸附层结构，研究结果表明，低浓度且阳离子表面活性剂在一水硬铝石表面为静电吸附时，其表面微极性大，阳离子表面活性剂零星吸附于矿物表面，当阳离子表面活性剂浓度增加时，一水硬铝石表面的微极性降低，阳离子表面活性剂在一水硬铝石表面形成了胶束吸附，形成胶束的表面活性剂离子的数随其浓度的增加而增加，表面疏水性逐渐增强，直至完全疏水，随着烃链碳原子数的增加，阳离子表面活性剂在一水硬铝石表面形成胶束吸附的浓度降低，烷基伯胺为弱电解质，其在水溶液中同时存在烷基胺离子和分子，由于离子分子共同吸附，烷基伯胺比相同碳原子数的季铵盐在一水硬铝石表面形成的半胶束吸附的分子数多。     

Oxygen adsorption on pyrite （100） surface by density functional theory

Pyrite (FeS2) bulk and (100) surface properties and the oxygen adsorption on the surface were studiedby using density functional theory methods. The results show that in the formation of FeS2 (100) surface, there exists a process of electron transfer from Fe dangling bond to S dangling bond. In this situation, surface Fe and S atoms have more ionic properties. Both Fe^2 and S^2- have high electrochemistry reduction activity, which is the base for oxygen adsorption. From the viewpoint of adsorption energy, the parallel form oxygen adsorption is in preference The result also shows that the state of oxygen absorbed on FeS2 surface acts as peroxides rather than O2.     

Recovery of zinc from low-grade zinc oxide ores by solvent extraction

1　INTRODUCTIONZincoxideoresarethemainsourceofzincmetalaf terzincsulfideores .Withtheescalatingdepletionofzincsulfideores,zincoxideoresincludingwillemite(Zn2 SiO4 ) ,hemimorphite[Zn4 (Si2 O7) (OH)·H2 O]andsmithsonite (ZnCO3) ,becameanimportantsourceofzinc[1] .InChina,zincoxideoresarerelativelyabundant,whicharemainlystoredinsouthwestandnorth westChi na,suchasYunnan ,Sichuan ,GuangxiandGansuprovince[2 ] .Manystudieshavebeendoneontheconcentrationofzincoxideores,yettheprogressesaresli…     

Calculation of electron structure by density function theory and electrochemical process of surface （100） of FeS2

The electron structure of FeS2 surface (100) was computed by DFT (density function theory) and the process of electron transfer in sulfide flotation was simulated through ab-initio calculation. The results show that the interaction between xanthate and FeS2 is controlled by the energy of valence band. The products and degree of the reaction depend on the density of state of valence band and concentration of positive hole in valence band. Interaction between xanthate and pyrite can be changed by modifying the election structure of the surface of pyrite. Xanthate is adsorbed on the surface of intrinsic pyrite. But the amount of xanthate adsorbed on the surface of the pyrite with sulfur vacancy is more than that on the surface of the intrinsic pyrite due to the higher electron and vacancy density. Xanthate is not adsorbed on the surface of pyrite with Fe vacancy because of its high Fermi energy.     

脆硫锑铅矿在乙硫氮饱和Ca(OH)_2体系中的电化学

采用循环伏安和交流阻抗法研究了脆硫锑铅矿在乙硫氮饱和Ca(OH)2体系中的电化学,讨论了电位调控浮选脆硫锑铅矿的工艺参数。电位在-378～22mV范围内,矿物的界面电容不断减少,介电常数变小,表面产物是疏水性的(CH3)2NCSS-、Pb((CH3)2NCSS-)2和S0;电位在22～222mV范围内时,矿物表面的疏水产物膜迅速破裂,电容增加,介电常数变大,界面亲水性增强。随着电位的继续升高,矿物表面不断产生亲水性离子和Fe(OH)3的沉积;对于乙硫氮饱和Ca(OH)2水溶液体系,脆硫锑铅矿的电位调节浮选的工艺参数应控制在-178～122mV之间,实际工艺中电位控制在-78mV～50mV范围为宜。     

Corrosive electrochemistry of jamesonite

The corrosive electrochemistry of jamesonite (Pb4FeSb6S14 ) was studied by the electrochemical methods of cyclic voltammetry, polarization, and AC impedance. The electrochemical processes of jamesonite were controlled by the corrosive reactions, growth of the metal-deficient and sulfur-riched layer, passivation and breakdown of elemental sulfur film on the electrode surface. The corrosive potential(φcorr) moves negatively, its corrosive current increases, and hydroxyl action becomes stronger with the rising pH value. The charge transfer resistance increases and the capacitance decreases due to the gradual growth of the metal-deficient and sulfur-riched layer on the mineral surface from -378 to 122mV (vs SHE). Element sulfur layer is formed at the potential of 122 mV. The charge transfer resistance increases and its capacitance rises slowly due to the gradual breakdown of sulfur film at voltage from 222mV to 422mV. S2O3^2- and SO4^2- ions occur when the electrode potential is over 422 mV. Under basic condition, the hydrophobic hydroxyl precipitate occurs on jamesonite surface, so that its collectorless floatability is poor. Under the condition of pH6.86, it can be deduced that the potential range of collectorless floatability of jamesonite is from 22 to 422mV due to the passive action of the hydrophilic sulfur on jamesonite surface, and its optimum range of floatable potential is between 122 and 322mV.     

榴辉岩型金红石矿资源综合利用开发研究

苏北某榴辉岩型金红石矿富含石榴石和绿辉石,由于金红石与石榴石、绿辉石等矿物密度和磁性差异较小,在选别金红石时分选效果不理想,且有用矿物未被充分回收,造成资源的浪费。通过对该金红石矿进行详细的工艺矿物学分析以及大量的选矿流程试验研究。结果表明：该矿金红石粒度较细、石榴石和绿辉石粒度较粗,金红石多赋存于石榴石与绿辉石粒间,或部分包裹于石榴石、绿辉石中,欲回收各有用矿物,需要采用阶段磨矿、联合选矿的方式方法。采用重-磁-浮联合选矿工艺,并在浮选时使用新型金红石捕收剂TXB、合理调控矿浆pH,有效实现了金红石、石榴石、绿辉石的分离,不仅得到了TiO2品位大于90%金红石精矿,而且还综合回收了矿石中的石榴石、绿辉石和钛铁矿,基本实现了无尾矿排放。该研究既利于环保,又利于企业经济效益的增长,为相似金红石矿的综合利用开发提供借鉴。     

含锌冶炼渣综合利用现状及发展趋势

为了顺应国家发展需求,对锌资源的不断开发使高品位矿石日益枯竭,并产生了大量的含锌冶炼渣,且由于锌的生产方式多样,含锌冶炼渣成分及性质各不相同,后续的处理难度也显著提升。含锌冶炼渣的大量堆存不仅会对周围环境造成严重危害,还会导致有价金属资源浪费。本文总结了含锌冶炼渣的危害及现行的利用方式,并着重介绍了回收含锌冶炼渣中有价金属的主要处理工艺的原理、优缺点及研究现状。最后指出了含锌冶炼渣资源化处理技术可加强的研究方向。      

高压辊磨机工艺参数对翠宏山某磁铁矿石粉碎行为的影响 高压辊磨机工艺参数对翠宏山某磁铁矿石粉碎行为的影响

为研究翠宏山某磁铁矿石在高压辊磨机中的粉碎行为,考察了比压力、辊隙对产品粒度特性和比能耗的影响。结果表明：高压辊磨机破碎产品粒度均匀性和破碎比均随辊隙增加而降低,新生成-8 mm粒级比功耗随辊隙增加先降低后提高;高压辊磨机破碎产品粒度均匀性和破碎比均随比压力增加而提高,新生成-8 mm粒级比功耗随比压力增加而降低。比功耗与破碎比存在近似的线性关系。相对于辊隙,比压力对高压辊磨机破碎效果的影响更大。试验结果可以为该磁铁矿石高压辊磨工艺设备参数的确定提供依据。