ADSORPTION MECHANISMS OF HS-IONS ON SULPHIDE MINERAL SURFACES RELATED TO Na2S-INDUCED FLOTATION
来源期刊：中国有色金属学报(英文版)1993年第3期
论文作者：Wang Dianzuo Sun Shuiyu Li Bodan
文章页码：20 - 26
Key words：HS- adsorption; sulphide minerals ;Na2S-induced flotation
Abstract: 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.
