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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 3    No. 3    September 1993

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ADSORPTION MECHANISMS OF HS-IONS ON SULPHIDE MINERAL SURFACES RELATED TO Na2S-INDUCED FLOTATION
Sun Shuiyu ;Wang Dianzuo ;Li Bodan

Central-South University of Technoloyy; Changsha 410083; China

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.  

 

Key words: HS- adsorption sulphide minerals Na2S-induced flotation

ISSN 1672-7029
CN 43-1423/U

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