三种常见捕收剂在方铅矿表面的吸附行为研究  

Study on the Adsorption Behavior of Three Common Collectors on Galena Surface

作　　者：艾光湧 蓝丽红[1] 王佳琪[1] 潘日发 方英帅 蓝平[1] 

机构地区：[1]广西民族大学化学化工学院广西多糖材料与改性重点实验室培育基地广西高校化学与生物转化过程新技术重点实验室,南宁530006

出　　处：《有色金属（选矿部分）》2017年第4期87-92,共6页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助(51464006);广西高校人才小高地建设创新团队项目(桂教[2011]47);广西民族大学重点科研项目(2012MDZD038);广西民族大学引进人才科研启动基金(2013QD015);广西民族大学-广西化工研究院研究生培养基地专项资金(BYB-012);广西自治区级大学生创新训练项目(201510608145)

摘　　要：采用密度泛函理论从微观角度研究了丁基黄药,丁基铵黑药和乙硫氮三种常见捕收剂在方铅矿表面的吸附能,并采用静态吸附法研究了它们在方铅矿表面吸附热力学。模拟计算结果表明,三种捕收剂在方铅矿表面的平衡吸附能绝对值大小排序为:丁基铵黑药>丁基黄药>乙硫氮,因而丁基铵黑药较易吸附在方铅矿表面。静态吸附试验结果表明,方铅矿对三种捕收剂的吸附量随温度的升高而增大;它们的吸附等温线符合Langmuir方程;n>1,其吸附过程均为优惠吸附;2<ΔH<43,说明捕收剂在方铅矿表面为吸热过程,是物理吸附和化学吸附共同作用的结果;ΔG<0,说明吸附是自发的。Butyl xanthate, ammonium dibutyl dithiophosphate and diethyldithiocarbamate are three common collectors of galena. Their adsorption energy on galena surface were investigated based on density functional theory from microscopic view, and their adsorption thermodynamics were studied by static adsorption method. The results of simulation calculation show that ammonium dibuyldithiophosphate exhibits the lowest capacity of eqiliblium adsorption. Therefore it is easy to adsorb on the surface of galena, followed by butyl xanthate and diethyldithiocarbamate. The results of static adsorption indicated that adsorptive capacity of these collectors on galena increased with the rise of temperature, and their adsorption isotherm are better fit to Langmuir equation. The adsorption processes are preferential due to n 〉 1, and endothermic based on 2 〈 △ H 〈 43, resulting from the physical and chemical adsorption. The negative value of △G indicates the spontaneous nature of the adsorption process.

关 键 词：密度泛函理论 方铅矿 捕收剂 静态吸附 吸附热力学 

分 类 号：TD923.14[矿业工程—选矿]