体系中的电化学
( 1. 中南大学资源加工与生物工程学院， 长沙 410083;
2. 衡阳师范学院 化学与材料科学系，衡阳 421008)
摘 要: 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-378～22 mV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22～222 mV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-178~122 mV之间，实际工艺中电位控制在-78mV~50 mV范围为宜。
关键字: 浮选电化学； 脆硫锑铅矿； 乙硫氮
（ 1. School of Resource Processing and Bioengineering，Central South University， Changsha 410083，China;
2. Department of Chemistry and Material Science，
Hengyang Normal University， Hengyang 421008， China）
Abstract: Electrochemistry of jamesonite in the system of saturated Ca(OH)2 solution containing diethyl dithiocarbamate was investigated by voltammetry and electrochemical impedance methods. The processing parameters of potential-controlled flotation were discussed. The interface capacitance of jamesonite continuously decreased and its medium-charge constant became small when the electrode potential was from -378 mV to 22 mV. The compositions of products on jamesonite surface are hydrophobic (CH3)2NCSS-，Pb((CH3)2NCSS-)2 and S0. When the electrode potential was from 22 mV to 222 mV， its capacitance increases and its medium-charge constant becomes large due to the dissolution of the passive film. The hydrophilicity of jamesonite surface becomes strong. The hydrophilic ions and deposition of Fe(OH)3 formed with further enhancement of the electrode potential. The processing parameter must be controlled in the range from -178 mV to 122 mV and the potential range from -78 mV to 50 mV is controlled for potential-controlled flotation of jamesonite in the system of diethyl dithiocarbamate and saturated Ca(OH)2 solution.
Key words: flotation electrochemistry; jamesonite; diethyl dithiocarbamamte
