| Considering its high impurity, Suichang Gold Mine smelts the cyaniding gold mud using the following processes: remove copper and zinc by combined pickling of sulfuric acid and complexing agent; produce silver positive plate by using lead to capture the gold and silver in the reduction smelting atmosphere; separate gold, silver and lead through the first electrolysis of silver; treat the black gold powder by acid-alkali-combination method; high-acid and low-copper silver electrolysis process; asymmetric ac power applied to gold electrolysis process; and etc. By using this process, the content of high pure silver produced can reach up to more than 99.996%, the content of high pure gold produced is stably more than 99.997%, and the contents of impurities are far less than the state-specified standard of high pure gold, which is 99.999%. The flowsheet is simple and convenient to operate, and the quality of finished product of gold and silver is in the leading position nationwide. |
