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Method for separating and recycling arsenic and iron from biological oxidation solution of sulfide ore

A technology for separation and recovery of oxidized liquid, applied in chemical instruments and methods, iron oxide/iron hydroxide, process efficiency improvement, etc., can solve the problems of high processing cost, large resource consumption, environmental pollution, etc., and achieve cost reduction, Ease of operation and reduced resource consumption

Active Publication Date: 2009-11-25
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for separating and recovering arsenic and iron from sulfide ore biological oxidation solution, so as to solve the existing problems of high processing cost, large resource consumption, environmental pollution, complicated operation, etc. in the treatment of sulfide ore biological oxidation solution. question

Method used

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  • Method for separating and recycling arsenic and iron from biological oxidation solution of sulfide ore

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Experimental program
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Effect test

Embodiment 1

[0017] as attached figure 1 Shown, is the schematic flow sheet of the present invention:

[0018] The biological oxidation solution of sulfide ore was selected for the experiment of treating arsenic and ferric sulfate. The oxidation solution contained pentavalent arsenic 5.25g / L, ferric iron 30.4g / L, and pH=0.89;

[0019] (1) Co-precipitation operation: add light-burned magnesium that neutralizes the precipitant to the sulfide ore biological oxidation solution, and the dosage is 26kg / m 3 , adjust the pH value to 5, make co-precipitation of arsenic and iron in the sulfide ore biological oxidation solution, the precipitation rate is 99.1% and 98.2%;

[0020] (2) Treatment of neutralizing solution: add 35kg / m to the neutralizing solution produced in the co-precipitation operation 3 The lime is further processed, and the pH value is adjusted to 8, so that calcium sulfate precipitates, and the calcium sulfate precipitate and water are separated, and the water is recycled as produ...

Embodiment 2

[0026] As shown in the accompanying drawings, it is a schematic flow diagram of the present invention:

[0027] The biological oxidation solution of sulfide ore was selected for the experiment of treating arsenic and ferric sulfate. The oxidation solution contained pentavalent arsenic 8.36g / L, ferric iron 32.2g / L, and pH value 0.84;

[0028] (1) Co-precipitation operation: add neutralizing precipitant light-burned magnesium to the sulfide ore biological oxidation solution, the dosage is 27kg / m 3 , adjust the pH value to 6, make co-precipitation of arsenic and iron in the sulfide ore biological oxidation solution, the precipitation rate is 99.2% and 98.5%;

[0029] (2) Treatment of neutralizing solution: add 37kg / m to the neutralizing solution produced in the co-precipitation operation 3 The limestone is further processed, the pH value is adjusted to 9, calcium sulfate is precipitated, calcium sulfate precipitate and water are separated, and the water is recycled as production...

Embodiment 3

[0035] as attached figure 1 Shown, is the structural representation of the present invention:

[0036] The selected oxidizing solution contains 8.36 g / L of pentavalent arsenic, 32.2 g / L of ferric iron, and the pH value of 0.84 is the same as in Example 2.

[0037] (1) Co-precipitation operation; this acidic oxidation solution uses light-burned magnesium as a neutralization precipitant, and the dosage is 27kg / m 3 , adjust the pH value to 6, make co-precipitation of arsenic and iron in the sulfide ore biological oxidation solution, the precipitation rate is 99.2% and 98.5%.

[0038] (2) Treatment of neutralizing solution; add 37kg / m3 to the neutralizing solution produced in the co-precipitation operation 3 The lime is further processed, and the pH value is adjusted to 10 to precipitate calcium sulfate, and the calcium sulfate precipitate and water are separated, and the water is recycled as production water after the gas treatment, and the calcium sulfate precipitate is used as ...

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Abstract

The present invention provides a method for separating and recycling arsenic and iron form the biological oxidation solution of sulfide ore and belongs to the technique. According to the method, firstly magnesium oxide is added into the biological oxidation solution of sulfide ore, then the pH value is adjusted to 5-6 so that the arsenic and iron in the biological oxidation solution generate coprecipitation, and the precipitate comprising iron and arsenic precipitate and the neutralizing agent are obtained through separating. Then the lime is added into the neutralizing solution so that the pH value obtains 8-10. The magnesium sulfate in the neutralizing agent and the lime generate calcium sulfate and magnesium hydroxide precipitate. The precipitate containing calcium sulfate and the treated water are separated. The separated water returns to the production system and the precipitate is recycled as the building material. After the coprecipitate is dried, water is added for leaching the magnesium sulfate in the coprecipitate. The precipitate after leaching and the water extract are separated. The water extract is combined with the neutralizing agent for entering the processing operation of the neutralizing agent. The arsenic in the precipitate after leaching is leached by the sodium hydroxide solution, and the arsenic leaching solution and the iron hydroxide precipitate are obtained after separation. The arsenic leaching solution is heated, evaporated and condensed to the arsenic content of 40g / L-60g / L. Then the solution is cooled for crystallizing. The sodium arsenate and the crystal mother liquor are obtained through separation. The mother liquor returns to the arsenic leaching system.

Description

Technical field: [0001] The invention relates to an industrial wastewater treatment and comprehensive recovery process, in particular to a method for separating and recovering arsenic and iron from sulfide ore biological oxidation liquid. Background technique: [0002] At present, the technological methods for treating the biological oxidation solution of sulfide ore mainly include lime neutralization precipitation method and stepwise precipitation method, wherein the lime neutralization precipitation method is to add lime to the acidic waste liquid to increase the pH value of the waste liquid and make the iron in the waste liquid , arsenic and sulfate to form precipitates, the lime neutralization precipitation method is easy to operate and is widely used in production at present, but when the lime neutralization precipitation method is used to treat waste liquid, iron, arsenic and calcium sulfate enter the sediment together, and the arsenic cannot be separated and recovered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C21B15/00C02F9/14C01F11/46C01G49/02
CPCY02P10/20
Inventor 金世斌李玉敏石清侠巩春龙张谷平
Owner CHANGCHUN GOLD RES INST
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