Abstract
During the laboratory tests the conditions of arsenic removal from acidic waste solutions of metallurgical enterprise in the form of arsenic trisulfide were determined. The technology based on the reduction of pentavalent arsenic to trivalent state with sodium pyrosulfite solution and following arsenic trisulfide precipitation from acidic solution after treatment with sodium sulfide solution was proposed. The arsenic removal proceeds with mechanical stirring, dosing the calculated amounts of reagents and collecting emissions of hydrogen sulfide. With such treatment, about 95% of arsenic, which was in the initial solution, passes into the precipitate. An enlarged laboratory experiment was carried out and the precipitate with 42.6% of arsenic and 46.9% of sulfur was obtained. The precipitate yield was ∼25.7 kg (dry weight) out of 1 m3 of the initial arsenic containing solution.
 Keywords: arsenic, arsenic trisulfide, acidic waste solutions, sodium sulfide, sodium pyrosulfite
Highlights
Publishing services provided by Knowledge ESelection and Peer-review under the responsibility of the TECHNOGEN-2019 Conference Committee
Raw materials processed at metallurgical enterprises often contain arsenic as an impurity and highly toxic arsenic compounds are found at almost all stages of metallurgical processing, including industrial wastes, which can pose a serious environmental hazard
The problem of finding new rational methods of arsenic removal from technological processes, arsenic disposal, environmentally safe and cost-effective management of arsenic-containing waste is actual for metallurgical enterprises
Summary
Selection and Peer-review under the responsibility of the TECHNOGEN-2019 Conference Committee
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