Fire refining is gold and the gold flux material (oxidizing agent and slagging) are mixed, then placed fire Alchemy furnace smelting at a temperature of 1200 ~ 1350 ℃ to obtain gold and silver alloy. Smelting, impurities such as copper, lead and zinc flux (flux slag and oxidizing agent) and generating slag oxidation reaction:
Oxidation reaction: The oxidant reacts with impurities such as copper, lead, zinc, iron to form a metal oxide, and reacts with sulfur to form a gas.
6Cu+2NaNO 3 â•Cu 2 O+Na 2 O+2NO
3Me+2NaNO 3 â• 3MeO+Na 2 O+2NO
(The above formula uses saltpeter as oxidant and Me as Zn, Pb, Fe, etc.)
S+2NaNO 3 ╠Na 2 O+2NO+SO 3 ↑
Slag formation reaction: the slagging flux reacts with the metal oxide to form slag.
mMeO+nSiO 2 â• mMeO nSiO 2
mMeO+nNa 2 B 4 O 7 â• mMeO nNa 2 O 2nB 2 O 3
(In the above formula, respectively of silica sand and a boron slagging flux)
Since the slag density is only 2 to 3 g / cm 3, the density ratio of gold and silver (gold 19.32 g / cm 3, 10.5 g of silver / cm3) is much lower, the process of smelting slag will float in the upper layer is excluded.
Oxidation reaction: The oxidant reacts with impurities such as copper, lead, zinc, iron to form a metal oxide, and reacts with sulfur to form a gas.
6Cu+2NaNO 3 â•Cu 2 O+Na 2 O+2NO
3Me+2NaNO 3 â• 3MeO+Na 2 O+2NO
(The above formula uses saltpeter as oxidant and Me as Zn, Pb, Fe, etc.)
S+2NaNO 3 ╠Na 2 O+2NO+SO 3 ↑
Slag formation reaction: the slagging flux reacts with the metal oxide to form slag.
mMeO+nSiO 2 â• mMeO nSiO 2
mMeO+nNa 2 B 4 O 7 â• mMeO nNa 2 O 2nB 2 O 3
(In the above formula, respectively of silica sand and a boron slagging flux)
Since the slag density is only 2 to 3 g / cm 3, the density ratio of gold and silver (gold 19.32 g / cm 3, 10.5 g of silver / cm3) is much lower, the process of smelting slag will float in the upper layer is excluded.
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