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Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
Print version ISSN 2225-6253
Abstract
WANG, Y.. Removal of arsenic and metal ions from acidic effluents via the Fenton reaction method. J. S. Afr. Inst. Min. Metall. [online]. 2023, vol.123, n.8, pp.415-421. ISSN 2411-9717. http://dx.doi.org/10.17159/2411-9717/1863/2023.
Arsenic-bearing acidic effluent from hydrometallurgical processes contains many harmful metal ions and must be appropriately treated before discharge. In the present study, arsenic, copper, zinc, aluminum, and magnesium were co-precipitated by means of the Fenton reaction. The precipitates obtained under different conditions were investigated to determine their stability. The results indicate that pH value and hydrogen peroxide (H2O2) dosage have significant effects on the removal of various elements. Arsenic, copper, zinc, and aluminum (but not magnesium) can be removed at pH 5-6 and anH2O2/As mole ratio of 2 at ambient temperature. The precipitates were mainly amorphous and granular with particle size in the micrometre range. The arsenic concentration in leachate from the toxicity characteristic leaching test was 3.6 mg/L, which proves that the precipitates are effective in fixing arsenic.
Keywords : acidic effluent; arsenic; coprecipitation; Fenton reaction; metal ions.