( 1. 中南大學 資源加工與生物工程學院， 長沙 410083;
2. 衡陽師范學院 化學與材料科學系， 衡陽 421008)
摘 要: 采用線性極化、 交流阻抗法， 研究了脆硫銻鉛礦在自然pH介質(zhì)中， 有無二乙基二硫代氨基甲酸鈉（DDTC）存在時的界面電化學行為。 結果表明： 隨著DDTC濃度增加， φcorr負移， Icorr減少， 抑制了陰極反應， 促進了陽極反應； 有DDTC比無DDTC存在時的電阻增大了4倍， 雙電層電容減少， 且隨著DDTC濃度的增加， 電化學電阻稍為減少而雙電層電容增大； DDTC在脆硫銻鉛礦表面呈扁平狀化學吸附， 并伴隨DDTC-金屬離子的鹽沉積， 產(chǎn)生鈍化作用， 氧化反應受阻； 脆硫銻鉛礦在無DDTC存在時， 因存在明顯的硫鈍化膜， 可實現(xiàn)無捕收劑浮選， 可浮電位范圍為： 0.173~0.373V; 有DDTC時， 主要表現(xiàn)出因DDTC的化學吸附、 DDTC-金屬離子鹽沉積而浮選， 也存在疏水性硫?qū)Ω∵x的影響， 可浮電位范圍為： 0.100~0.473V。
關鍵字: 脆硫銻鉛礦； 捕收劑； 界面電化學
（ 1. School of Resource Process and Bioengineering,
Central South University, Changsha 410083, China;
2. Department of Chemistry and Materials Science,
Hengyang Normal University, Hengyang 421008, China）
Abstract: The interface electrochemical characterization of jamesonite in 0.1mol·L-1 KNO3 media (pH=6.9) with and without diethyl dithiocarbamate(DDTC) was studied by potentiodynamic and impedance measurements. With increasing Et2NCSSNa concentration, its corrosive potential moves negatively and its corrosive current decreases, so its cathodic reaction is inhibited and anodic reaction is promoted. The electrochemical resistance with Et2NCSSNa in solution is as four times as the electrochemical resistance without Et2NCSSNa, at the same time, double capacitance decreases. The electrochemical resistance slows down and its capacitance rises with Et2NCSSNa concentration raised. Et2NCSSNa is adsorbed chemically, and the salts of its metal ions are deposited, and passive action appears on jamesonite surface, so its oxidization reaction is limited. Jamesonite can be floated without collector because of obvious passive film of sulfur on the surface of jamesonite and its potential range of flotation is between 0.173 and 0.373V. In the case of Et2NCSSNa, jamesonite can be floated due to chemical adsorption and salt deposition of Et2NCSS-metal ions mainly, also deposition of sulfur on its surface and its potential range of flotation is between 0.100 and 0.473V.
Key words: jamesonite; collector; interface electrochemistry
