Environment-friendly energy-saving normal pressure and temperature wet preparation process for refined bismuth
A wet process and energy-saving technology is applied in the field of environmental protection and energy-saving normal temperature and pressure wet process to prepare refined bismuth. It can solve the problems of complex pharmaceuticals, non-environmental protection, and high cost, and achieve high bismuth ore leaching rate, low cost and environmental protection. The effect of easy operation
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Embodiment 1
[0053] The copper-bismuth concentrate is leached under normal temperature and pressure by blowing air into the sodium chloride and hydrochloric acid system.
[0054] Process technical indicators:
[0055] The leaching temperature is at room temperature 25°C, under normal pressure, hydrochloric acid: 90g / L, sodium chloride: 120g / L, liquid-solid ratio 5:1, leaching oxidant is air, leaching time is 4h, basically realizes the complete leaching of Bi, bismuth leaching The yield was 97%, and the pH value of the resulting leachate was 0.5. The composition of the leachate is shown in Table 1-1
[0056] Table 1-1 Leaching liquid composition
[0057] element Bi 3+ Cu 2+ sn 2+ Zn 2+ Fe 3+ Content (g / L) 36.70 2.19 0.23 2.50 0.65
[0058] It can be seen from Table 1-1 that the Bi in the leaching solution 3+ The content is relatively high. Copper in the solution will affect the electrodeposition extraction of bismuth and product quality, therefore...
Embodiment 2
[0063] The bismuth concentrate is leached under normal temperature and pressure by blowing air into the sodium chloride and hydrochloric acid system.
[0064] Process technical indicators:
[0065] The leaching temperature is at room temperature 29°C, under normal pressure, hydrochloric acid: 100g / L, sodium chloride: 110g / L, liquid-solid ratio 5:1, leaching oxidant is air, leaching time is 4 hours, basically realizes the complete leaching of Bi, bismuth The leaching rate is 97.63%, and the pH value of the resulting leachate is 0.5. The composition of the leachate is shown in Table 2
[0066] Table 2 Leaching solution composition
[0067] element Bi 3+ Cu 2+ sn 2+ Zn 2+ Fe 3+ Content (g / L) 31.30 0.26 0.15 1.23 0.62
[0068] It can be seen from Table 2 that the Bi in the leaching solution 3+ The content is relatively high, and its leaching solution directly enters the cyclone electrolysis device for electrowinning to produce sponge bism...
Embodiment 3
[0071] Copper-bismuth concentrate is leached under normal temperature and pressure by blowing air into the calcium chloride and hydrochloric acid system.
[0072] Process technical indicators:
[0073] The leaching temperature is at room temperature 20°C, under normal pressure, hydrochloric acid: 140g / L, calcium chloride: 120g / L, liquid-solid ratio 4:1, leaching oxidant is air, leaching time is 4h, basically realizes the complete leaching of Bi, bismuth leaching The yield was 91.32%, and the pH value of the resulting leachate was 0.5. The composition of the leachate is shown in Table 3-1
[0074] Table 3-1 Leaching solution composition
[0075] element Bi 3+ Cu 2+ sn 2+ Zn 2+ Fe 3+ Content (g / L) 15.61 2.67 0.43 3.15 1.06
[0076] It can be seen from Table 3-1 that the Bi in the leaching solution 3+ The content is relatively low, and the copper in the solution will affect the electrodeposition extraction of bismuth and product quality,...
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