METHOD FOR STABILIZATION OF ARSENIC
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United States of America Patent
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Oct 12, 2017
app pub date -
Apr 12, 2016
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Apr 12, 2016
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Abstract
A method for formation of scorodite and for stabilization of arsenic by formation of scorodite, comprising using sodium hypochlorite as an oxidizing agent. The method comprises producing sodium hypochlorite having a concentration in a range between 1 and 3 w/w % using a diaphragm-less electrolytic cell operating with a sodium salt solution having a salt concentration in a range between 2 and 10 w/w %; diluting a sodium hypochlorite solution to less than 1 w/w % in an arsenic solution at an oxydo reduction potential in a range between 900 and 1100 mV (Pt, AgCl reference) and a pH comprised in range between 0.5 and 2.0; contacting a resulting oxidized arsenic with a ferric salt; and raising the pH to 5.
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