硫化锌加压浸出过程的电位-pH图  

ε-pH diagram during pressure leaching of zinc sulfide

作　　者：古岩[1] 张廷安[1] 吕国志[1] 牟望重[1] 豆志河[1] 

机构地区：[1]东北大学多金属共生矿生态化利用教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2011年第2期112-119,共8页Journal of Materials and Metallurgy

基　　金：国家"十一五"科技支撑计划项目(2008BAB34B01);国家自然科学基金资助项目(51004033;50974035;51074047)

摘　　要：通过热力学计算,绘制出温度110～160℃,氧分压分别为0.7、0.9和1.1 MPa,离子浓度为1.0mol/L的ZnS-H2O系的电位-pH图.由电位-pH图可知,随着温度由110℃提高到160℃,S与Zn2＋稳定区对应的pH范围逐渐变正、氧化电位值逐渐增大,提高温度有利于硫化锌的加压浸出过程在较低的酸浓度下进行,但温度高于150℃后增幅较小.随着氧分压由0.7 MPa提高到1.1 MPa,水的稳定区范围增大,液相中溶解氧含量增多,有助于提高氧化速度,促进硫化锌加压浸出过程锌的溶解及元素硫的生成.高温高压条件下ZnS-H2O系的电位-pH图为硫化锌的加压浸出实验参数的选择提供了热力学上的指导作用.ε-pH diagrams of ZnS-H2O system were drawn through thermodynamical calculation where the temperature was from 110 ℃ to 160 ℃,the oxygen partial pressure was 0.7 MPa,0.9 MPa and 1.1 MPa respectively and the ionic concentration was 1.0.When the temperature is increased from 110 ℃ to 160 ℃,the pH range and the oxygen potential of stable regions for S and Zn2＋ in the ε-pH diagrams are gradually more positive.Improved temperature is helpful for pressure leaching of zinc sulfide proceeding at a lower acidic concentration.When the temperature is higher than 150 ℃,the increased value is smaller.When the oxygen partial pressure is increased from 0.7 MPa to 1.1 MPa,the stable regions of water become larger.Increased content of dissolve oxygen is helpful to improve oxidation rate and promote dissolution of zinc and conversion of sulfur element.The ε-pH diagrams of ZnS-H2O system at high temperature and high pressure might provide a thermodynamical guideline for the pressure leaching of zinc sulfide.

关 键 词：硫化锌 电位-PH图 ZnS-H2O系 加压浸出 

分 类 号：TF803.21[冶金工程—有色金属冶金]