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Zinc sulfide, ZnS is a white to yellowish-white mineral. It is often found in sphalerite and is used as a pigment and to make white glass, rubber and plastics. It is also an ingredient in pesticides, luminous paints and X-ray and television screens.
In solution, zinc sulfide is usually a dihydrate and has the formula ZnS. Its valence band has an electron-filled energy gap of 350 kJ/mol and its conduction band is empty. This makes the material a semiconductor with high redox potential and good fluorescence electroluminescent properties.
Physical & Chemical Property
The physical properties of zinc sulfide are highly dependent on the composition of the solid and the state of surface stoichiometry. It is interesting to note that the surface stoichiometry of zinc sulfide may profoundly affect its adsorption properties.
Hydrolysis of zinc sulfide in solution is accompanied by a series of chemical reactions. These include the acid-base reaction, solution redox reaction, precipitation and dissolution of zinc sulfide as well as adsorption and surface complexation of the ions involved in the above reactions.
The adsorption of ethyl and octyl xanthate at the surface of zinc sulfide as a function of solution pH was investigated. The results showed that ethyl xanthate and octyl xanthate both have an adsorption capacity of less than 1 mM. Hence, they are not suitable as collectors for sulfide mineral flotation. In addition, their adsorption capacity is reduced by the sulfide ions that are adsorbed at the surface.