Process for reducing the cyanide content of a solution

摘要

PCT No. PCT/AU90/00289 Sec. 371 Date Mar. 19, 1991 Sec. 102(e) Date Mar. 19, 1991 PCT Filed Jul. 5, 1990 PCT Pub. No. WO91/00248 PCT Pub. Date Jan. 10, 1991.A process for treatment of waste aqueous process streams from industrial process containing both cyanide ions and dissolved ammonia to reduce the cyanide content, comprising the consecutive steps: (a) adding a halogenating agent to the solution while maintaining the pH of the solution at greater then 7; (b) removing ammonia from the solution by aeration; (c) acidifying the solution to a pH of less then 7; (d) substantially neutralizing the solution; and (e) removing the ammonia from the solution by aeration.