| 摘要 |
PCT No. PCT/SE81/00060 Sec. 371 Date Oct. 1, 1981 Sec. 102(e) Date Oct. 1, 1981 PCT Filed Mar. 4, 1981 PCT Pub. No. WO81/02569 PCT Pub. Date Sep. 17, 1981.A process for purifying an acid aqueous solution containing heavy metals by adding sulfide ions to said acid aqueous solution at a first pH lower than 3.4, precipitating a first heavy metal, adding sulfide ions again to said first precipitate containing acid aqueous solution, after adjusting to a pH of higher than 4, to precipitate a second heavy metal, and then removing the resultant first and second precipitates from the acid aqueous solution.
|
