Sulphidization to improve the nickel oxide recovery by froth flotation

Akira Otsuki, David J. Robinson

Abstract


This study aimed to investigate the sulphidization-flotation of nickel oxide. Sulphidization was conducted before froth flotation to convert the surface of nickel oxide to nickel sulphide. Key variables considered were type of sulphidization reagent, sulphidization Eh, time of sulphidization, and flotation Eh.Ammonium sulphide ((NH4)2S) was more effective in decreasing the Eh of nickel oxide suspension than sodium hydrogen sulphide (NaSH) and calcium sulphide (CaSx) and selected for sulphidization-flotation. With potassium amyl xanthate (PAX) addition, nickel oxide recovery increased after sulphidization with (NH4)2S. Increasing the time of sulphidization (> 5 min) decreased nickel oxide recovery. Flotation at Eh of –450 mV SHE produced the maximum recovery of 63%, from 37% without sulphidization (2x10-4 M PAX). The developed sulphidization-flotation method was identified as a good potential option to enhance the recovery of nickel oxide from natural ores.


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References


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MAYFEB Journal of Chemistry and Chemical Engineering

MAYFEB TECHNOLOGY DEVELOPMENT

Toronto, Ontario, Canada

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