Process for abstracting bismuth by low-temperature alkaline fusion metallurgy of bismuth clean ore
A bismuth refining and alkali process technology, applied in the field of low-temperature alkaline smelting bismuth concentrate to extract bismuth, can solve the problems of bad operating conditions, high energy consumption and high cost, and achieve the advantages of improving the bismuth recovery rate, reducing the smelting temperature and eliminating pollution. Effect
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Embodiment 1
[0022] A: Alkaline smelting of bismuth concentrate
[0023] Dissolve 10 grams of caustic soda in 15ml of water in advance to make a concentrated alkali solution, then knead it evenly with 100 grams of A# bismuth concentrate, place it on the bottom of a graphite crucible, cover it with 147 grams of soda ash, and then melt it, adding it 20 minutes before the melting time reaches 5 grams of NaNO3 were smelted at 700°C for 60 minutes and kept at 750°C for 30 minutes; the weight of crude bismuth gold was 24.78g, the direct yield of bismuth was 97%, and the slag and matte were 211.74g.
[0024] B: ball milling leaching
[0025] Add 211.74 grams of slag and matte, 850 grams of steel balls, and 500 mL of water to a 1000 mL ball mill, grind and soak at 90°C for 4 hours, then filter, wash the slag with 100 mL of hot water for 3 times, the pH value is 7.5, and the dry weight of the filter residue is 59.1 grams , filtrate 560mL, containing Na 2 CO 3 148.5g / L, NaOH4.1g / L, NaOH 2 SO 4...
Embodiment 2
[0029] Taking B# bismuth concentrate as the sample, the scale is 1000g concentrate / time,
[0030] A: Alkaline smelting of bismuth concentrate
[0031] Dissolve 100 grams of caustic soda in 150ml of water in advance to make a concentrated alkali solution, then mix and knead evenly with 1000 grams of B# bismuth concentrate, place it on the bottom of a graphite crucible, cover it with 1470 grams of soda ash, and then smelt it. Add it 20 minutes before the smelting time reaches 50 grams of NaNO3 were smelted at 650°C for 60 minutes and kept at 700°C for 60 minutes; the weight of crude bismuth gold was 236.4g, the direct yield of bismuth was 96.5%, and the slag and matte were 2167.4g.
[0032] B: ball milling leaching
[0033] Add 2,167.4 grams of slag and matte, 9,000 grams of steel balls, and 6,000 mL of water to a 10-liter ball mill, grind and immerse at 90°C for 5 hours, then filter, wash the slag with 1,000 mL of hot water for 5 times, the pH value is 7.2, and the dry weight ...
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