Reduction of lead sulfate to lead sulfide with carbon monoxide

Abstract

In order to decrease the solubility of PbSO₄ and enhance lead recovery from PbSO₄ bearing wastes, CO was employed as a reductant to transform PbSO₄ into PbS. Reaction system was established and reductive thermodynamics of PbSO₄ was calculated by software HSC 5.0. The effects of gas concentration, reaction temperature, time and mass of sample on reduction of PbSO₄ were examined by thermogravimetry (TG) and XRD. Roasting tests further verify the conclusions of thermodynamic and TG analyses. The results show that increasing temperature in the reasonable range and CO content are favorable for the formation of PbS. The reduction process is controlled by chemical reaction and calculation value of the activation energy is 47.88 kJ/mol.

Keywords

lead sulfate / reduction / carbon monoxide / lead sulfide / pyrometallurgy

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