Method for fire refining of crude bismuth
A technology of pyro-refining and coarse bismuth, which is applied in the direction of improving process efficiency, etc., can solve problems such as polluting the operating environment, complicated treatment process, and affecting the direct yield of bismuth, and achieves less waste residue generation, reduced chlorine gas flow, and improved The effect of direct yield
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Embodiment 1
[0026] The present embodiment provides a kind of thick bismuth pyro-refining method, as figure 2 As shown, the specific steps are as follows:
[0027] (1) First, 800kg of thick bismuth (Bi93.50wt%, Pb5.73wt%, Ag0.64wt%, As0.215wt%, Sb0.134wt%, Cu0.433wt%, Te0.164wt%) are decoppered by melting until The copper content in crude bismuth is 0.0015wt%; the process of smelting and removing copper is to melt the crude bismuth in a smelting pot, remove the molten slag at 600°C, and drop the temperature to 500°C to remove the copper slag for the first time , when the temperature drops to 350°C, remove the copper slag for the second time;
[0028] (2) the thick bismuth that removes copper through step (1) is that pressure is 10-30Pa, temperature is 1050 ℃ of conditions and obtains once thick bismuth (Bi98.99wt%, Pb0.63wt%, Ag0.008wt% by vacuum distillation 8h) , Sb0.011wt%, Te0.0033wt%, As0.0015wt%) and high silver coarse bismuth (Bi55.38wt%, Pb15.44wt%, Ag25.28wt%, Sb1.634wt%, Te0.8...
Embodiment 2
[0033] The present embodiment provides a kind of thick bismuth pyro-refining method, as figure 2 As shown, the specific steps are as follows:
[0034] (1) First, 1t of coarse bismuth (Bi82.65wt%, Pb11.77wt%, Ag1.04wt%, As0.65wt%, Sb0.55wt%, Cu0.53wt%, Te0.76wt%) is decoppered by melting until The copper content in crude bismuth is 0.0027wt%; the process of smelting and removing copper is to remove the molten slag at 620°C after melting the coarse bismuth in a melting pot, and remove the first copper removal slag when the temperature drops to 530°C , when the temperature drops to 370°C, remove the copper slag for the second time;
[0035] (2) the thick bismuth after step (1) removes copper is that pressure is 5-40Pa, temperature is 1100 ℃ of conditions and obtains once thick bismuth (Bi98.28wt%, Pb1.42wt%, Ag0.013wt% by vacuum distillation 12h) %, Sb0.084wt%, Te0.0064wt%, As0.0022wt%) and high silver thick bismuth (Bi33.92wt%; Pb24.86wt%; Ag34.65wt%; Sb1.46wt%; Te1.55wt%, As...
Embodiment 3
[0038] The present embodiment provides a kind of thick bismuth pyro-refining method, as figure 2 As shown, the specific steps are as follows:
[0039] (1) First, 500kg of thick bismuth (Bi96.34wt%, Pb2.31wt%, Ag0.34wt%, As0.27wt%, Sb0.083wt%, Cu0.12wt%, Te0.11wt%) is decoppered by melting until The copper content in crude bismuth is 0.0013wt%; the process of smelting and removing copper is to remove the molten slag at 620°C after melting the coarse bismuth in the smelting pot, and remove the copper slag for the first time when the temperature drops to 510°C , when the temperature drops to 380°C, remove the copper slag for the second time;
[0040] (2) the thick bismuth after step (1) removes copper is that pressure is 10-30Pa, temperature is 1000 ℃ of conditions and obtains once thick bismuth (Bi99.26wt%, Pb0.44wt%, Ag0.005wt% by vacuum distillation 6h) %, Sb0.54wt%, Te1.32wt%, As1.47wt%) and high silver coarse bismuth (Bi63.22wt%, Pb12.35wt%, Ag20.74wt%, Sb0.003wt%, Te0.00...
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