Effect of Phosphates on the Metal Ion Activated Surface Complexes at the SiO_2-H_2O Interface and in Quartz Deactivation in Flotation System

Abstract

Abstract: The complexation of phosphates in the quartz-metal ion-H_2O-oleate system was studied. Computer assisted calculations with the aid of the advanced program SOLGASWATER and known equilibrium constants were used to evaluate the mechanism,The calculation results revealed that in the presence of a certain amount of phosphates, metal ions adsorbed at the quartz-H_2O interface will be transferred into solution.Thus the competi- tion for metal ions between phosphates and the quartz surface leads to surface deactivation and re- duced floatability.Various distribution diagrams clearly demonstrate the change of surface complexation as a function of added phosphate concentration.The deactivation products were also evaluated.

Key words: complexation, phosphate, quartz flotation, activation, deactivation, surface complex

SUN Zhongxi W. Forsling CHEN Jin Division of Inorganic Chemistry,Lulea University of Technology,S-951 87 Lulea,SwedenDept.of Mineral Engineering,Central South University of Technology,Changsha,410083,ChinaTo whom correspondence should be addressed. Effect of Phosphates on the Metal Ion Activated Surface Complexes at the SiO_2-H_2O Interface and in Quartz Deactivation in Flotation System[J]. J Mater Sci Technol, 1992, 8(3): 163-172.

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Effect of Phosphates on the Metal Ion Activated Surface Complexes at the SiO_2-H_2O Interface and in Quartz Deactivation in Flotation System

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