Acidic wet smelting

First, waste residue treatment

Antimony acidic wet slag leach residue, reduced slag three kinds of slag and waste water treatment. The leaching slag of single strontium sulfide ore contains higher elemental sulfur and SiO ₂ , and is a good raw material for cement production after recovery of sulfur by flotation. Jamesonite lead ore concentrate chloride leaching residue rich silver lead valuable elements such as sulfur, sulfur transformed dechlorination flotation concentrate to give low temperature reduction and direct smelting of lead carbonate concentrate, and then sulfur concentrate The flotation method sorts out elemental sulfur and produces a secondary lead concentrate. The reducing slag generally contains Sb ≥ 50%, which is a good raw material for the pyrometallurgical refining plant; if silver is contained, the silver is first recovered and the hydrazine is recovered. The main components of the wastewater treatment slag are Fe(OH) ₂ , Fe(OH) ₃ and CaSO ₄ , which are harmless to the environment and are piled up in the slag yard or paved.

Second, wastewater treatment

The acid wet refining wastewater is mainly a replacement liquid, about 23m ³ /t yttrium oxide, the composition is: Sb 0.004g ∕L; Ag 0.0014g ∕L; Fe ^{2 +} 7.83g ∕L; Pb 0.13g ∕L; Cu 0.0069 g∕L; As 0.0104 g/L; Sn 0.009g∕L; Cl ^- 46.42 g/L; SO ₄ ^{2 -} 3.77 g ∕L. The wastewater is first neutralized with limestone to pH ≥ 2, neutralized with lime, and bubbled into the air or added with an oxidizing agent such as bleaching powder, and finally adjusted to pH = 7 to 7.5; precipitated, harmful elements Pb, As, Cd, The content of Sb, Zn, etc. can reach the national standard.

Third, waste gas treatment

The exhaust gas in the acid wet refining process has acid mist in the leaching and regeneration process, acid mist in the reduction process and ammonia mist in the neutralization process. The amount of acid mist and ammonia mist is reduced, and it is only necessary to discharge the outside of the plant. However, during the leaching and regeneration process, the amount of acid mist is large and the temperature is high. In addition to HCl, it also contains corrosive and toxic substances such as Cl ₂ , SbCl ₃ and SbCl ₅ , which must be treated. The specific method is to use this acid. The mist gas is introduced into the leaching tower, and is washed with a solution containing SbCl ₃ , such as a dipping water washing solution, and the eluent is returned to the leaching process. In this way, all of the above substances are recycled and turned into waste.

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