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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

Active Publication Date: 2008-04-30
CHINA NAT GOLD GROUP CORP TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for separating and recovering arsenic and iron from acidic waste liquid containing arsenic acid and ferric sulfate, which solves the problem that current lime neutralization precipitation method cannot separate and recover arsenic and iron in acidic waste liquid. The one-step precipitation method is used to treat the sulfide in the acidic waste liquid, which undergoes oxidation-reduction reactions with ferric and pentavalent arsenic, consumes a large amount of sulfide, causes high waste liquid treatment costs, and generates a large amount of sulfur, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Waste liquid contains pentavalent arsenic 5.86g / L, trivalent arsenic 0.06g / L, ferric iron 28.4g / L, ferrous iron 0.1g / L, pH value 0.86;

[0025] The specific method is as follows:

[0026] 1. Restore operation:

[0027] Add 20 g / L of sodium metabisulfite to the waste liquid to reduce the pentavalent arsenic in the waste water to trivalent arsenic and the ferric iron to ferrous iron;

[0028] 2. Vulcanization operation:

[0029] Add sodium sulfide 24g / L to the acidic waste liquid treated by the reduction operation, so that arsenic is precipitated as arsenic sulfide, and the arsenic sulfide precipitate and acidic arsenic removal solution are separated, and the pH value of the sulfide precipitate is 0.3-1.8;

[0030] 3. Neutralization operation:

[0031] Add 32g / L of magnesium oxide to the acidic dearsenic solution after the solid-liquid separation in the above sulfidation operation, so that the pH value reaches 7, so that the iron in the dearsenic solution is precipitat...

Embodiment 2

[0036] Waste liquid contains pentavalent arsenic 5.86g / L, trivalent arsenic 0.06g / L, ferric iron 28.4g / L, ferrous iron 0.1g / L, pH value 0.86;

[0037] The specific method is as follows:

[0038] 1. Restore operation:

[0039] 16g / L of sulfur dioxide is added to the waste liquid to reduce the pentavalent arsenic in the waste water to trivalent arsenic and the ferric iron to ferrous iron;

[0040] 2. Vulcanization operation:

[0041] Add sodium sulfide 24g / L to the acidic waste liquid treated by the reduction operation, so that arsenic is precipitated as arsenic sulfide, and the arsenic sulfide precipitate and acidic arsenic removal solution are separated, and the pH value of the sulfide precipitate is 0.3-1.8;

[0042] 3. Neutralization operation:

[0043] Add 35g / L of magnesium oxide to the acidic dearsenic solution after the solid-liquid separation of the above sulfidation operation, so that the pH value reaches 7, so that the iron in the dearsenic solution is precipitated...

Embodiment 3

[0048] Waste liquid contains pentavalent arsenic 5.86g / L, trivalent arsenic 0.06g / L, ferric iron 28.4g / L, ferrous iron 0.1g / L, pH value 0.86;

[0049] The specific method is as follows:

[0050] 1. Restore operation:

[0051] 16g / L of sulfur dioxide is added to the waste liquid to reduce the pentavalent arsenic in the waste water to trivalent arsenic and the ferric iron to ferrous iron;

[0052] 2. Vulcanization operation:

[0053] Add sodium sulfide 24g / L to the acidic waste liquid treated by the reduction operation, so that arsenic is precipitated as arsenic sulfide, and the arsenic sulfide precipitate and acidic arsenic removal solution are separated, and the pH value of the sulfide precipitate is 0.3-1.8;

[0054] 3. Neutralization operation:

[0055] Add 38 g / L of light burnt magnesia containing 91% magnesium oxide to the acidic dearsenic solution after the solid-liquid separation of the above-mentioned sulfidation operation, so that the pH value reaches 7, and the iro...

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Abstract

The invention relates to a method for separating and recovering arsenic and iron from acidic waste liquid containing arsenic acid and ferric sulfate, which belongs to the treatment and comprehensive recovery method of industrial waste water. The method is composed of four operation steps of reduction operation, vulcanization operation, neutralization operation and sulfate precipitation operation. Among them, the reduction operation is to reduce the pentavalent arsenic in the waste liquid to trivalent arsenic, and the ferric iron is reduced to ferrous iron; the sulfidation operation is to make the arsenic form arsenic sulfide precipitation, separate and obtain the arsenic-containing precipitate and the arsenic-removing liquid; the neutralization operation is The iron in it is precipitated in the form of ferric hydroxide, and the iron-containing precipitate and the iron-removing liquid are separated; the sulfate precipitation operation is to add lime to the iron-removing liquid, so that the sulfate in it produces calcium sulfate and hydroxide precipitation, and separates Calcium sulfate-containing precipitate and water are obtained, and the water is returned to the production system for recycling as production water. The advantage is that the amount of vulcanizing agent and sulfuric acid used in the vulcanization operation is greatly reduced, thereby reducing the cost of waste liquid treatment, which is beneficial to environmental protection and has strong practicability.

Description

technical field [0001] The present invention relates to a method for the treatment and comprehensive recovery of industrial waste water, in particular to a treatment method applicable to industrial acid waste water containing arsenic acid and iron sulfate, especially a kind of acid waste liquid containing arsenic acid and iron sulfate A method for separating and recovering arsenic and iron. Background technique [0002] As we all know, there are currently two methods for treating acidic wastewater containing arsenic and iron sulfate: one is the lime neutralization precipitation method, and the other is the step-by-step precipitation method; among them, the lime neutralization precipitation method is to add Lime, to increase the pH value of the waste liquid, so that the iron, arsenic and sulfate in the waste liquid are precipitated. There is only one operation step in the lime neutralization operation, and the arsenic, iron and calcium sulfate are put into the sediment togeth...

Claims

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Application Information

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IPC IPC(8): C01G28/00C01G49/02C01F11/46
Inventor 金世斌巩春龙高金昌
Owner CHINA NAT GOLD GROUP CORP TECH CENT
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