METHOD FOR REMOVING ARSENIC FROM COBALT PRODUCTION WASTE

摘要

FIELD: metallurgy.SUBSTANCE: method involves solid-phase roasting of wastes mixed with soda to fix arsenic to a water-soluble form of sodium arsenate. Then, water leaching and deposition from arsenic solution is performed. In order to obtained the product from water leaching with low residual arsenic content of 0.7%, solid-phase roasting is performed at 850°C so that a roasted product containing 2.9% of arsenic is obtained. Water leaching of the roasted product is performed with extraction degree of 84%. Deposition from arsenic solution is performed in the form of arsenic sulphide with sodium sulphide at pH=3 with deposition degree of 99.6%, and filtrate with arsenic content of 0.02 g/l for removal of residual amount of arsenic by neutralisation and deposition with iron compounds meets the requirements of sanitary norms.EFFECT: obtaining low-toxicity commodity product of arsenic sulphide and product of water leaching with low residual content of arsenic.1 dwg, 1 tbl, 5 ex