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A method for separating and purifying sodium salt in arsenic-alkali slag

A technology of arsenic-alkali residue and sodium salt, which is applied in the field of separating sodium salt, can solve the problems of weak processing capacity and high cost of ion membrane exchange method, and achieve good economic and environmental benefits and low As content.

Inactive Publication Date: 2017-03-29
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the carbon dioxide method is introduced into sulfide and other components in the later stage; the ion membrane exchange method has weak processing capacity and high cost; the existing conventional sodium arsenate evaporation-cooling crystallization process is an applied technology for treating and separating sodium arsenate , but the thermophysical properties of sodium arsenate are very similar to other substances in the waste residue, and the efficient separation of sodium arsenate and other inorganic salts is facing great challenges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of method for separating and purifying sodium salt in arsenic-alkali slag, its steps are as follows:

[0017] 1) Leach arsenic-alkali slag in hot water at 80°C for 60 minutes, the volume-to-mass ratio of hot water to arsenic-alkali slag is 4:1, then filter, and gradually add hydrogen peroxide with a mass concentration of 30% to the filtrate until no Stop adding when precipitation occurs; then leach at 60°C for 30 minutes, filter, and the filtrate is sodium arsenate compound salt solution;

[0018] 2) Put the sodium arsenate compound salt solution into the crystallizer, and then place the crystallizer in a constant temperature water bath stirrer with a temperature of 85°C. When the solution is concentrated to a quarter of the volume of the original solution, stop stirring and keep The temperature of the water bath is 65°C, and after standing for crystallization for 2.5 hours, it is quickly filtered to obtain the filtrate a and the filter residue a, a...

Embodiment 2

[0022] Embodiment 2: a kind of method for separating and purifying sodium salt in arsenic-alkali slag, its steps are as follows:

[0023] 1) Leach arsenic-alkali slag in hot water at 80°C for 60 minutes, the volume-to-mass ratio of hot water to arsenic-alkali slag is 4:1, then filter, and gradually add hydrogen peroxide with a mass concentration of 30% to the filtrate until no Stop adding when precipitation occurs; then leach at 60°C for 30 minutes, filter, and the filtrate is sodium arsenate compound salt solution;

[0024] 2) Put the sodium arsenate compound salt solution into the crystallizer, and then place the crystallizer in a constant temperature water bath stirrer with a temperature of 80°C. When the solution is concentrated to a quarter of the volume of the original solution, stop stirring and keep The temperature of the water bath is 60°C, and after static crystallization for 2 hours, rapid filtration is obtained to obtain the filtrate a and filter residue a, and the...

Embodiment 3

[0028] Embodiment 3: a kind of method for separating and purifying sodium salt in arsenic-alkali slag, its steps are as follows:

[0029] 1) Leach arsenic-alkali slag in hot water at 80°C for 60 minutes, the volume-to-mass ratio of hot water to arsenic-alkali slag is 4:1, then filter, and gradually add hydrogen peroxide with a mass concentration of 30% to the filtrate until no Stop adding when precipitation occurs; then leach at 60°C for 30 minutes, filter, and the filtrate is sodium arsenate compound salt solution;

[0030] 2) Put the sodium arsenate compound salt solution into the crystallizer, and then place the crystallizer in a constant temperature water bath stirrer with a temperature of 90°C. When the solution is concentrated to a quarter of the volume of the original solution, stop stirring and keep The temperature of the water bath is 70°C, and after standing for 3 hours, it is quickly filtered to obtain the filtrate a and the filter residue a, and the filter residue ...

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Abstract

The invention aims at providing a method for separating and purifying sodium salts in arsenic alkali residue. The method can help separate high-purity sodium carbonate and sodium arsenate from antimony smelting arsenic alkali residue to achieve recycling of the sodium carbonate and sodium arsenate. The method comprises condensing a sodium arsenate composite salt solution at 60-70 DEG C to separate out most of Na2CO3 out of the solution, at the moment, all As is in the solution. Both magnetic fields and ultrasound can change the thermodynamic properties of chemical compounds and affect the solubility, the crystallization induction time, the width of the metastable region and the crystallization manner. A filter liquor a contains large amounts of Na+, under the coupling action of specific temperature and the magnetic field and ultrasound of the corresponding intensity, strong common-ion effects enable most of sodium arsenate to crystalize from the solution and other impurity components to stay in the solution. Meanwhile, by performing the pretreatment in the step 3) on the filter liquor a before the ultrasound and magnetic field treatment, the content of arsenic in crystalized sodium arsenate can be improved.

Description

technical field [0001] The invention relates to a method for separating sodium salts, in particular to a method for separating and purifying sodium salts in arsenic-alkali slag. Background technique [0002] Arsenic-alkali slag is the scum produced when alkali is added to remove arsenic in the antimony refining process. Its main components include antimony-containing salts, arsenic-containing salts, selenium-containing salts, carbonates, sulfates, and some metal antimony. Among them, the arsenic content is about 10% to 15%, and 99% of the toxic pollutants exist in the form of soluble sodium arsenate. Once the arsenic-alkali slag leaks, the arsenic exposed to the environment will enter the water body and the food chain, and at least it will endanger human health. Seriously, it will lead to death. There have been many poisoning incidents caused by improper storage and leakage in China. At present, the total stockpile of arsenic-alkali slag in my country has reached more than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/10
CPCY02P10/20
Inventor 曾桂生上官平
Owner NANCHANG HANGKONG UNIVERSITY
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