Gold refining is carried out at a high temperature 1200 ~ 1300 ℃, gold silver smelting process mainly based on different physico-chemical properties and other metals is carried out. Difference in specific gravity of copper and lead zinc and silver is relatively large, thus facilitating separation of gold and slag; gold and silver is much higher than the oxidation potential of Cu, Pb, temperature and atmosphere in general, silver (particularly gold) is not Oxidation occurs, thus facilitating the separation of gold and silver from other metals. The process of smelting gold is roughly divided into two steps: one is the oxidation of bismuth metal and the action of flux to form slag; the second is that the specific gravity of slag is only 2.5 to 3, which is much lower than the specific gravity of gold and silver (gold 19.32, silver 10.5), and the slag floats during smelting. Excluded from above. The melting point, specific gravity, viscosity and the degree of silicic acid of the slag directly affect the separation difficulty and separation speed of gold and silver and slag.
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