METHOD FOR EXTRACTING ARSENIC FROM WASTE OF AMMONIA-AUTOCLAVED REDISTRIBUTION OF COBALT ORES

摘要

FIELD: chemistry.;SUBSTANCE: method involves sintering roasting the waste in the presence of soda. Further, aqueous leaching and precipitation from the arsenic solution proceed. Herewith sintering roasting is carried out at 740°C with a waste/soda ratio of 1:1 for 1.5 hours to produce a roasting product containing 4.4% of arsenic. Water leaching of the roasted product is carried out at 80°C, T:H=1:6 for 1 hour producing the product of leaching with a low residual arsenic content of 0.5-0.6%. From the solution at 60°C by neutralizing to pH of 8-9, silicic acid is precipitated, which is then calcined with the receipt of silicon dioxide. Then, at pH=3, arsenic sulfide is precipitated from the solution.;EFFECT: reducing the temperature and duration of roasting, increasing the degree of extraction of arsenic into the solution, producing a product of water leaching with a low residual arsenic content, individual products of arsenic sulfide and silicon dioxide.;1 dwg, 5 tbl, 3 ex