Harmless resourceful treatment method for non-ferrous smelting arsenic-containing solid waste
A resource-based and non-ferrous technology, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve problems such as the difficulty in safe disposal of arsenic components and the difficulty in resource utilization of struvite-type arsenic acid double salts, and achieve Satisfies the effect of industrialized production, simple process and fast process plan
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Embodiment 1
[0032] Take 5kg of lead anode slime (specific components are Pb: 12.88%, As: 27.53%, Sb: 24.92%, Ag: 5.08%, in which arsenic mainly exists in the form of elemental and oxidized state, grinding particle size ≤ 1mm) for alkali oxidation Leach, add hydrogen peroxide as an oxidant (1.6 times the theoretical amount) during the leaching process, control the liquid-solid ratio to 10:1, the dosage of sodium carbonate and sodium hydroxide are both 1mol / L, the temperature is 60 ℃, the leaching time is 2h, The stirring speed is 500 rpm. After the leaching reaction is completed, solid-liquid separation is performed to obtain an alkaline arsenic-containing leaching solution, wherein the leaching rate of arsenic is 90.47%, and the leaching rate of valuable metals is lower than 5%.
[0033] The magnesium chloride and ammonium chloride are mixed according to the molar ratio n(Mg / N)=0.4, and the magnesium ammonium reagent is prepared. According to n(Mg / As)=1.5, magnesium ammonium reagent was a...
Embodiment 2
[0042] Take 5kg of copper soot (specific components are Pb: 24.95%, Cu: 14.21, As: 5.78%, Zn: 2.34%, Fe: 1.44%, grinding particle size ≤ 1mm) for alkaline oxidation leaching, adding hydrogen peroxide as an oxidant in the leaching process (1.8 times the theoretical amount), the liquid-solid ratio is controlled to be 5:1, the dosage of sodium carbonate and sodium hydroxide are both 1mol / L, the temperature is 50°C, the leaching time is 2h, and the stirring speed is 500rpm. After the leaching reaction is completed , solid-liquid separation to obtain alkaline arsenic-containing leaching solution, wherein the leaching rate of arsenic is 85.22%, and the leaching rate of valuable metals is less than 10%.
[0043] Magnesium sulfate and ammonium bicarbonate were mixed at a molar ratio of n(Mg / N)=0.25 to prepare a magnesium ammonium reagent. According to n(Mg / As)=1.8, magnesium ammonium reagent was added to the alkaline leaching solution, and the stirring time was 2h at a speed of 500 r / ...
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