Effect of pH and Potential in Chemical Precipitation of Copper by Sodium Dithionite
The aim of this work was to study the effect of pH and potential in copper precipitation from nickel laterite leach solution. A synthetic solution was prepared to simulate the real conditions and sodium dithionite was used as reducing agent. The effect of pH was studied between pH 0.50 and 3.50. Sodium dithionite 1 mol/L was added to decrease the potential. The stirring speed was 45 rpm and reaction time was 45 min. Results indicated that copper precipitation decreased when pH increases. Copper precipitation was selective in 240 mV at pH 0.50–1.50. Co-precipitation was observed in experiments performed in pH above 2.00.
KeywordsNickel laterite Copper Sodium dithionite Hydrometallurgy
To the São Paulo Research Foundation and Capes (Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP), grants 2012/51871-9 e n° 2017/17340-0, for the financial support through scientific initiation scholarship.
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