Method for separating and reclaiming arsenic and iron from acidic waste liquid containing arsenic acid and ferric sulfate
A technology for separation and recovery of acidic waste liquid, applied in chemical instruments and methods, calcium/strontium/barium sulfate, iron oxide/iron hydroxide, etc., can solve the problem of high waste liquid treatment costs, large amounts of sulfur generated, and inability to separate and recycle Arsenic and iron problems, to achieve the effect of strong practicability, reduce treatment costs, reduce the amount of vulcanizing agent and sulfuric acid
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[0023] Example 1:
[0024] The waste liquid contains 5.86g / L pentavalent arsenic, 0.06g / L trivalent arsenic, 28.4g / L trivalent iron, 0.1g / L divalent iron, and pH 0.86;
[0025] The specific method is as follows:
[0026] 1. Restore job:
[0027] Add 20g / L of sodium metabisulfite to the waste liquid to reduce the pentavalent arsenic in the wastewater to trivalent arsenic, and the trivalent iron to divalent iron;
[0028] 2. Vulcanization operation:
[0029] Add 24g / L of sodium sulfide to the acidic waste liquid after the reduction operation to precipitate the arsenic as arsenic sulfide, and separate the arsenic sulfide precipitate and the acidic dearsenic solution. The pH of the sulfide precipitate is 0.3-1.8;
[0030] 3. Neutralization work:
[0031] Add 32g / L of magnesium oxide to the acidic dearsenic solution after the solid-liquid separation of the above-mentioned vulcanization operation to make the pH value reach 7, so that the iron in the dearsenic solution is precipitated as...
Example Embodiment
[0035] Example 2:
[0036] The waste liquid contains 5.86g / L pentavalent arsenic, 0.06g / L trivalent arsenic, 28.4g / L trivalent iron, 0.1g / L divalent iron, and pH 0.86;
[0037] The specific method is as follows:
[0038] 1. Restore job:
[0039] Add 16g / L of sulfur dioxide to the waste liquid to reduce the pentavalent arsenic in the wastewater to trivalent arsenic, and the trivalent iron to divalent iron;
[0040] 2. Vulcanization operation:
[0041] Add 24g / L of sodium sulfide to the acidic waste liquid after the reduction operation to precipitate the arsenic as arsenic sulfide, and separate the arsenic sulfide precipitate and the acidic dearsenic solution. The pH of the sulfide precipitate is 0.3-1.8;
[0042] 3. Neutralization work:
[0043] Add 35g / L of magnesium oxide to the acidic dearsenic solution after the solid-liquid separation of the above-mentioned vulcanization operation to make the pH value reach 7, so that the iron in the dearsenic solution is precipitated as ferro...
Example Embodiment
[0047] Example 3:
[0048] The waste liquid contains 5.86g / L pentavalent arsenic, 0.06g / L trivalent arsenic, 28.4g / L trivalent iron, 0.1g / L divalent iron, and pH 0.86;
[0049] The specific method is as follows:
[0050] 1. Restore job:
[0051] Add 16g / L of sulfur dioxide to the waste liquid to reduce the pentavalent arsenic in the wastewater to trivalent arsenic, and the trivalent iron to divalent iron;
[0052] 2. Vulcanization operation:
[0053] Add 24g / L of sodium sulfide to the acidic waste liquid after the reduction operation to precipitate the arsenic as arsenic sulfide, and separate the arsenic sulfide precipitate and the acidic dearsenic solution. The pH of the sulfide precipitate is 0.3-1.8;
[0054] 3. Neutralization work:
[0055] Add 38g / L of light burned magnesium containing 91% magnesium oxide to the acidic dearsenic solution after the solid-liquid separation of the above-mentioned vulcanization operation, so that the pH value reaches 7, so that the iron in the de...
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