Method for deep recovery of antimony from arsenic alkali residue leaching solution by using electric potential control

A technology of potential control and arsenic-alkali slag, applied in the field of resources and environment, to avoid instant oxidation and decomposition, improve oxidation efficiency, and avoid blind addition

Active Publication Date: 2013-02-13
HUNAN RES INST FOR NONFERROUS METALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defects of the existing antimony recovery method in the leach solution of arsenic-alkali slag, the present inv

Method used

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  • Method for deep recovery of antimony from arsenic alkali residue leaching solution by using electric potential control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Oxidation at room temperature, using potential control, slowly adding hydrogen peroxide at the bottom

[0032] After leaching the arsenic-alkali slag of an enterprise with hot water, 1 ton of the leach solution was taken. After component analysis, it contained Sb: 5.82g / L, As: 15.56g / L, and the temperature was 73°C.

[0033] Pump the leaching solution into the oxidation tank, add hydrogen peroxide slowly at the bottom, control the time for adding the deantimony agent to 30 minutes, and stir rapidly at the same time, the stirring speed is controlled at about 100r / min, and the stirring speed can be quickly mixed to mix the solution evenly It is advisable to quickly mix the deantimony agent with the solution. Use cooling water to cool down, keep the temperature at 25°C during the reaction process, and the total oxidation time is 60 minutes. The online electrode potentiometer is used to monitor the potential of the whole process during the reaction process. The p...

Embodiment 2

[0034] Embodiment 2: Oxidation at room temperature, one-time addition of hydrogen peroxide (comparative example)

[0035] After leaching the arsenic-alkali slag of an enterprise with hot water, 1 ton of the leachate was taken. After component analysis, it contained Sb: 5.97g / L, As: 17.69g / L, and the temperature was 79°C.

[0036] Pump the leaching solution into the oxidation tank, add 15L of hydrogen peroxide at one time, and stir rapidly at the same time, the stirring speed is controlled at 100r / min, so that the hydrogen peroxide can be mixed with the solution quickly. Cooling water was used to lower the temperature, the temperature was kept at 25°C during the reaction, and the total oxidation time was 60 minutes. After analysis, the treated leachate contains Sb: 1.26g / L, As: 16.98g / L, and the removal rate of antimony is 78.9%. The collected sodium antimonate product was 18.8kg, containing Sb: 43.16%, As: 1.12%, which reached the quality requirements of common sodium antimon...

Embodiment 3

[0037] Example 3: high temperature oxidation, take potential control, slowly add hydrogen peroxide at the bottom

[0038] After leaching arsenic-alkali slag from a certain enterprise with hot water, 1 ton of the leach solution was taken. After component analysis, it contained Sb: 5.97g / L, As: 18.20g / L, and the temperature was 75°C.

[0039] The leachate is pumped into the oxidation tank, heated by steam, and the temperature is kept at 80°C throughout the reaction process. The hydrogen peroxide is added slowly at the bottom, and the time for adding the hydrogen peroxide is controlled to be 30 minutes. At the same time, the stirring speed is controlled to be 100 r / min, so that the hydrogen peroxide is mixed with the solution quickly, and the total oxidation time is 60 minutes. During the reaction process, an online electrode potentiometer was used to monitor the potential of the whole process. During the process, the potential rose slowly. When it reached the set -620mv, the add...

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Abstract

The present invention relates to the field of resource environment, and specifically provides a method for deep recovery of antimony from an arsenic alkali residue leaching solution by using electric potential control. The method specifically comprises the following steps: (1) material adding: adding an arsenic alkali residue leaching solution to an oxidation tank, adding an antimony removing agent hydrogen peroxide to the oxidation tank from the bottom of the oxidation tank, and stopping antimony removing agent addition when an electric potential achieves -530 mv to -640 mv, wherein a hydrogen peroxide addition time is controlled to 1/3-1/2 of the total oxidation time; (2) oxidation: continuously stirring when antimony removing agent addition, and carrying out an oxidation reaction, wherein the total oxidation time is 40-90 min, and the oxidation process is maintained to a temperature of 20-80 DEG C; and (3) filtration: wherein the filter residue is a sodium antimoniate product, and the filtrate is provided for arsenic and alkali recovery. According to the present invention, an oxidation degree of the antimony in the solution can be accurately controlled, the obtained sodium antimoniate is sold as a product or returns to an antimony smelting system as an antimony raw material to be recycled, the antimony in the leaching solution can be recovered to the maximal degree, antimony resource waste is avoided, and no secondary pollution is generated.

Description

technical field [0001] The invention relates to the field of resources and environment, in particular to the recovery of antimony in the leaching solution of arsenic-alkali slag. Background technique [0002] my country is a big storage, production, and export country of antimony. There are more than 200 antimony manufacturers, and the output of antimony products is about 100,000 tons, accounting for more than 80% of the world. The output of antimony products is produced by pyrotechnics. Antimony metallurgical production will produce arsenic-alkali slag whether it adopts pyroprocess or wet process. At present, the total stockpile of arsenic-alkali slag in my country has reached more than 200,000 tons, and there is an increase of about 5,000 tons every year. The average content of antimony in the arsenic-alkali slag reaches 20%, and the total content of antimony in the stockpiled arsenic-alkali slag is more than 40,000 tons. If it is recycled, the economic value is huge. ...

Claims

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Application Information

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IPC IPC(8): C22B30/02C22B7/00C22B3/44
CPCY02P10/20
Inventor 陈伟万文玉戴永俊吴兆清彭新平吴思容朱安玲陈佳利刘鹊鸣李志强刘放云邓卫华
Owner HUNAN RES INST FOR NONFERROUS METALS
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