Abstract
The rise of residues derived from hydrometallurgical processes of zinc production has made this industry face numerous challenges. Residues contain elements whose reclamation is of high significance due to the economic improvement of the whole process and the removal of environmental consequences. The previous study examined the selective extraction of Zn and As from hot purification filter cakes of the zinc process and found that the dominant species in arsenic-bearing solution was AsO43−. With a Zn2(AsO4) (OH) composition containing As 23.1 wt pct, As was precipitated with an 95 pct efficiency by adding zinc sulfate under the following conditions: Molar ratio Zn/As = 1, pH 6.5, time = 4 hours, temperature = 80 °C, and stirring velocity = 500 rpm. The zinc arsenate hydroxide was successfully used as an activator of the zinc powder in the cobalt cementation process. The examination of the precipitate revealed that As increased the anodic and cathodic reactions potential difference. Thus, thermodynamic driving force of the reaction increased and cementation improved by forming intermediate compounds, like CoAs, with higher stability and more positive reduction potential.
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Behnajady, B., Moghaddam, J. Synthesizing Zinc Arsenate and Its Application in Cobalt Purification Process. Metall Mater Trans B 54, 1113–1121 (2023). https://doi.org/10.1007/s11663-023-02744-1
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DOI: https://doi.org/10.1007/s11663-023-02744-1