METHOD FOR STABILIZATION OF ARSENIC
    3.
    发明申请

    公开(公告)号:US20170291828A1

    公开(公告)日:2017-10-12

    申请号:US15096421

    申请日:2016-04-12

    IPC分类号: C01G28/02 C25B9/06 C25B1/26

    摘要: 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.