Improving collecting performance of sodium oleate using a polyoxyethylene ether in scheelite flotation  

聚氧乙烯醚改善油酸钠在白钨矿浮选中的捕收性能（英文）

作　　者：CHEN Chen ZHU Hai-ling QIN Wen-qing CHAI Li-yuan JIA Wen-hao 陈臣;朱海玲;覃文庆;柴立元;贾文浩

机构地区：[1]School of Mineral Processing and Bioengineering, Central South University [2]School of Metallurgy and Environment, Central South University

出　　处：《Journal of Central South University》2018年第12期2971-2978,共8页中南大学学报（英文版）

基　　金：Project(2016RS2016)supported by Hunan Provincial Science and Technology Leader(Innovation Team of Interface Chemistry of Efficient and Clean Utilization of Complex Mineral Resources);China

摘　　要：In order to improve the scheelite flotation with sodium oleate(NaOL),the effect of a non-ionic polyoxyethylene ether(JFC-5)on the floatability of scheelite was investigated through flotation experiments at10°C,compared with60mg/L NaOL alone,the recovery of scheelite is improved from22%to85%in the presence of JFC-5with a mass ratio of20%at pH10.Moreover,the resistance to Ca2+of NaOL is increased.The adsorption mechanism was analyzed by zeta potential measurement,contact angle measurement and X-ray photoelectron spectroscopy(XPS)analysis.The results show that the adsorption of NaOL on scheelite surface is enhanced after adding JFC-5due to the more negative zeta potentials and larger contact angles of scheelite.And the co-adsorption of NaOL and JFC-5is confirmed by XPS analysis,so it is indicated that the adsorption of JFC-5decreases the electrostatic repulsion between the oleate ions,resulting in the stronger adsorption of NaOL on scheelite surface.In short,the mixed NaOL/JFC-5collector can effectively improve scheelite flotation.为了增强油酸钠体系下白钨矿的浮选行为,通过浮选试验考察了一种非离子型聚氧乙烯醚JFC-5对白钨矿在10°C时可浮性的影响。与单独使用60 mg/L油酸钠时相比较,当pH=10,添加质量比为20%的JFC-5时,白钨矿的浮选回收率由22%提高到85%。此外,油酸钠的抗钙离子能力得以增强。通过动电位测试、接触角测量和X射线光电子能谱(XPS)考察了捕收剂在矿物表面的吸附机理,结果显示添加JFC-5后,白钨矿表面的动电位更负且接触角更大,表明油酸钠在白钨矿表面的吸附增强。XPS分析结果证实了JFC-5和油酸钠在白钨矿表面的共吸附,从而推测JFC-5在白钨矿表面的吸附减弱低了油酸根离子之间的静电斥力,使得油酸钠在白钨矿表面的吸附更强。总之,油酸钠/JFC-5组合捕收剂可以有效改善白钨矿浮选。

关 键 词：SCHEELITE polyoxyethylene ether synergistic effect low temperature flotation ADSORPTION 

分 类 号：TD923[矿业工程—选矿] TD954