A method for comprehensive recovery of valuable metals from arsenic-containing fume and safe disposal of arsenic
A valuable metal and arsenic fume technology, applied in the field of metallurgy, can solve the problems of low recovery rate of valuable metals, limited market for arsenic products, untreated sodium arsenate, etc. Effects of low arsenic content
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Embodiment 1
[0044] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw materials are Pb 1.57%, As48.56%, Sn0.51%, Sb 21.24%, Zn 0.73%, Te 0.35%, Se 0.25%, and the following steps are adopted To process:
[0045] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor, the control conditions are liquid-solid volume mass ratio 10:1, stirring speed 300r / min, leaching temperature 160°C, oxygen partial pressure 2Mpa, The leaching time is 2 hours. After the leaching is completed, remove the slurry, filter and separate, and separate to obtain the leaching liquid and leaching residue;
[0046] After testing: the arsenic leaching rate is 61.53%, and the concentration of each element in the leach solution is Pb 709.60ppm, Se31.02ppm, Sb1.26g / L, Te 123.28ppm, As29.88g / L.
[0047] (2) Arsenic solidification in the leach solution: adjust the pH value of the leach solution obtained in st...
Embodiment 2
[0054] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 6.88%, As36.51%, Sn1.11%, Sb 29.77%, Zn 0.54%, Te 0.24%, Se 0.05% for processing:
[0055] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fumes into the reactor, the control conditions are liquid-solid volume mass ratio 20:1, stirring speed 300r / min, leaching temperature 160°C, oxygen partial pressure 0.5Mpa , the leaching time is 2h. After the leaching is over, remove the slurry and filter and separate, and separate to obtain the leaching liquid and leaching residue;
[0056] After testing: the arsenic leaching rate is 51.29%, and the concentration of each element in the leach solution is Pb 515.20ppm, Se31.56ppm, Sb0.88g / L, Te 122.26ppm, As 9.36g / L.
[0057] (2) Solid arsenic in the leach solution: adjust the pH value of the leach solution obtained in step (1) to 2, add CaO as the arsenic precipitatio...
Embodiment 3
[0064] Taking arsenic-containing soot from a lead-zinc smelter in China as an example, the main components of the raw material are Pb 5.46%, As30.29%, Sn0.98%, Sb 29.58%, Zn 0.68%, Te 0.26%, Se 0.07% using the following steps deal with:
[0065] (1) Oxygen pressure water immersion: Weigh a certain quality of high arsenic and antimony fume in the reaction kettle, the control conditions are liquid-solid volume mass ratio 10:1, stirring speed 300r / min, leaching temperature 200℃, oxygen partial pressure 2.5Mpa , the leaching time is 4h, after the leaching is completed, remove the slurry and filter and separate, and separate to obtain the leachate and leach residue;
[0066] After testing: the arsenic leaching rate is 64.52%, and the concentration of each element in the leach solution is Pb 956.35ppm, Se18.91ppm, Sb0.93g / L, Te 144.92ppm, As 19.54g / L.
[0067] (2) Solid arsenic in the leaching solution: adjust the pH value of the leaching solution obtained in step (1) to 1.5, add C...
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