| The purity of the crude gold powder obtained by reducing cyanide gold slime in a domestic smelter is low, so the crude gold is further refined and purified by the chlorine leaching-reduction process. In the production process, the crude gold is first dissolved by clorination leaching with hydrochloric acid + sodium chlorate, and the gold in the leaching solution is selectively reduced by controlling the potential with sodium metabisulfite. The silver and lead are fully precipitated from the chlorine leaching solution by replenishing water and cooling. By adjusting the pH value, changing the sodium metabisulfite addition method, and accurately controlling the reduction potential, the product gold ingot reaches the IC-Au99.99% standard. Two years of production practice have created obvious economic benefits. |
