ADSORPTION MECHANISMS OF HS-IONS ON SULPHIDE MINERAL SURFACES RELATED TO Na_2S-INDUCED FLOTATION

作     者：Sun, Shuiyu Wang, Dianzuo Li, Bodan Central-South University of Technoloyy, Changsha 410083, China 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：1993年第3卷第3期

页      面：20-26页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Supported by National Natural Science Foundation of China 

主　　题：HS^- adsorption sulphide minerals Na₂S-induced flotation 

摘      要：The adsorption mechanisms of HS- ions existing in air-saturated alkaline solutions on sulphide minerals （including pyrite, arsenopyrite, chalcopyrite and galena） were investigated. The measurement of adsorption density, solvent extraction-chemical analysis of neutral sulphur at the surfaces, measurements of pulp potential and voltammogram, and flotation tests were done. Both the electrochemical and non-electrochemi cal adsorption models of HS- ions were established. The former was observed and resulted in the formation of neutral sulphur （S°）when the pyrite and arsenopyrite were chosen, and hence renders the surfaces hy drophobic and induced the two minerals flotation. It is called Na2S-induced flotation. On the other hand, the latter took place and did not produce S° when the chalcopyrite and galena were selected, and hence de presses the collectorless flotation of the two minerals. The adsorptions of HS- ions were mainly influenced by potentials, pH and the electron structures of the mineral surfaces.