Arsenic removal method for arsenic-containing smoke dust
An arsenic fume and arsenic removal technology, which is applied in chemical instruments and methods, arsenate/arsenite, arsenic compounds, etc., can solve the problems of long process, valuable metals, secondary pollution, etc., and achieve simple and easy process line, saving energy consumption
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Embodiment 1
[0027] A method for wet treatment of arsenic-containing smoke, the treatment method is as follows:
[0028] (1) leaching 500g of arsenic-containing smoke and dust containing 13.3% arsenic, 26.6% tin, 2.72% indium, and 7.95% lead, using sodium hydroxide and sodium chlorate, leaching conditions: sodium hydroxide concentration 80g / L, liquid-solid volume The mass ratio is 10:1 (ml:g), the reaction temperature is 90°C, the amount of sodium chlorate is 0.3 times the mass of arsenic in the flue dust, and the reaction time is 4 hours to obtain 4.8L of sodium arsenate solution and leaching residue. Add water to wash and filter to obtain 326g of tin concentrate containing 40.5% Sn, 4.15% indium and 1.37% arsenic;
[0029] (2) The leachate was cooled to 20-25° C., filtered and separated to obtain 4.6 L of crystallization mother liquor containing 2.1 g / L of arsenic and 5.72 g / L of lead, and 325 g of sodium arsenate with a content of 91.6%;
[0030] (3) Add 2 times the theoretical amount ...
Embodiment 2
[0032] A method for wet treatment of arsenic-containing smoke, the treatment method is as follows:
[0033] (1) leaching 500g of arsenic-containing smoke dust containing 19.8% of arsenic, 24.3% of tin, 3.2% of indium, and 6.6% of lead, using sodium hydroxide and potassium permanganate, leaching conditions: sodium hydroxide concentration 200g / L, liquid-solid The volume-to-mass ratio is 6:1 (ml:g), the reaction temperature is 95°C, the reaction time is 2 hours, and the amount of potassium permanganate is 0.5 times the mass of arsenic in the smoke to obtain 2.85L of sodium arsenate solution and 312g of leaching residue. The leaching residue was washed with water, filtered to obtain a tin concentrate containing 39.6% of Sn, 5.1% of indium, and 1.48% of arsenic;
[0034] (2) Cooling and crystallization of the leachate, the leachate was cooled to 20-25°C, filtered and separated to obtain 2.65L crystallization mother liquor containing 3.2g / L arsenic and 8.7g / L lead, and 508g of sodiu...
Embodiment 3
[0037] A method for wet treatment of arsenic-containing smoke, the treatment method is as follows:
[0038] (1) 500g of arsenic-containing fumes containing 10.2% of arsenic, 28.8% of tin, 3.5% of indium, and 5.3% of lead are leached with sodium hydroxide and hydrogen peroxide, leaching conditions: leaching conditions: sodium hydroxide concentration 150g / L, liquid-solid The volume to mass ratio is 4:1 (ml:g), the reaction temperature is 60°C, the reaction time is 6 hours, the amount of hydrogen peroxide is 0.6 times the mass of arsenic in the smoke, and 1.86L of sodium arsenate solution and 324g of leaching residue are obtained. The leaching residue is water After washing and filtering, a tin concentrate containing 43.9% tin, 5.35% indium and 1.18% arsenic was obtained;
[0039] (2) Cooling and crystallization of the leachate, the leachate was cooled to 20-25°C, filtered and separated to obtain 1.65L crystallization mother liquor containing 2.5g / L of arsenic and 10.6g / L of lead...
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