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Method for recycling sodium sulfate waste liquid

A technology of sodium sulfate waste liquid and sodium sulfate, which is applied in the fields of sulfite preparation, electrical components, electrochemical generators, etc., can solve the problems of complicated preparation process, difficulty in realizing large-scale production, and high equipment requirements, and achieves simple operation, Good economic and environmental benefits, low cost effect

Active Publication Date: 2017-06-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method of sodium ferrous sulfate generally adopts the hydrothermal method, the preparation process is complicated, the equipment requirements are high and it is difficult to realize large-scale production

Method used

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  • Method for recycling sodium sulfate waste liquid
  • Method for recycling sodium sulfate waste liquid
  • Method for recycling sodium sulfate waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment includes the following steps:

[0045] (1) Excessive sodium bicarbonate is added to the sodium sulfate waste liquid discarded in the process of preparing the lithium-ion battery ternary material until the solution is no longer precipitated, and then filtered to obtain the filtrate.

[0046] (2) After detection, the concentration of sulfate radicals is 1.5 mol / L, and the concentration of sodium ions is 3 mol / L. This embodiment is designed to generate 1.5mol of the target product sodium ferrous sulfate, take 1L of filtrate, add an appropriate amount of hydrochloric acid solution to adjust the pH of the solution to neutral;

[0047] (3) Add deionized water to adjust the sodium ion concentration in 1L of the mixed solution to 1mol / L, then add 3mol of ferrous sulfate, supplemented by vigorous stirring, stir at 80°C for 8h and evaporate the solvent in the solution to obtain Precursor of sodium ferrous sulfate, a cathode material for sodium ions;

[0048] (4)...

Embodiment 2

[0054] This embodiment includes the following steps:

[0055] (1) Excessive sodium bicarbonate is added to the sodium sulfate waste liquid discarded in the process of preparing the lithium-ion battery ternary material until the solution is no longer precipitated, and then filtered to obtain the filtrate.

[0056] (2) After detection, the concentration of sulfate radicals is 1.5 mol / L, and the concentration of sodium ions is 3 mol / L. This embodiment is designed to generate 1.5mol of the target product sodium ferrous sulfate, take 1L of filtrate, add an appropriate amount of hydrochloric acid solution to adjust the pH of the solution to neutral;

[0057] (3) Add deionized water to adjust the sodium ion concentration in the mixed solution to 1mol / L, then add 3mol of ferrous sulfate, supplemented by vigorous stirring, stir at 80°C for 10h and evaporate the solvent in the solution to obtain sodium The precursor of sodium ferrous sulfate, an ion cathode material;

[0058] (4) The ...

Embodiment 3

[0061] This embodiment includes the following steps:

[0062] (1) The existing waste coal chemical waste liquid contains organic matter and solid waste. First, perform biochemical treatment to reduce the organic matter and filter out the solid matter. After adding excessive sodium bicarbonate until the solution no longer has precipitation, filter to obtain the filtrate;

[0063] (2) After testing, the concentration of sulfate radicals is 1.2 mol / L, and the concentration of sodium ions is 3 mol / L. This embodiment is designed to generate 1.5 mol of the target product sodium ferrous sulfate, take 1 L of filtrate and add 0.3 mol of sulfuric acid, adjust the concentration ratio of sodium ions and sulfate radicals in the solution to 2:1, add an appropriate amount of hydrochloric acid solution to adjust the pH of the solution to neutral;

[0064] (3) Add deionized water to adjust the sodium ion concentration in the mixed solution to 1mol / L, then add 3mol of ferrous sulfate, supplemen...

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Abstract

The invention discloses a method for recycling sodium sulfate waste liquid. According to the method, an industrial waste sodium sulfate solution is used, and a precursor of sodium ferrous sulfate can be obtained by steps of adjusting the concentration of the waste sodium sulfate solution, adding an appropriate amount of ferrous sulfate, performing stirring for a period of time at a certain temperature, and drying to remove moisture. A sodium ion battery cathode material, namely sodium ferrous sulfate, can be obtained by sintering the precursor at a certain sintering temperature. The invention finds a recycling way with a high economic added value for the industrial waste sodium sulfate solution, the sodium ion battery cathode material is prepared by using sodium sulfate wastewater as a raw material, the resource utilization of the sodium sulfate waste liquid is realized, good economic and environmental benefits are achieved, and the prepared sodium ferrous sulfate material has the advantages of high specific capacity, high working voltage, good cycling stability and excellent rate performance when used as a sodium ion cathode material.

Description

technical field [0001] The invention belongs to the field of waste liquid recovery, and in particular relates to a recovery and reuse method for sodium sulfate waste liquid. Background technique [0002] Sodium sulfate is a by-product of many chemical industry production departments and metallurgical factories. It can be used as an industrial raw material for daily chemical, glass, papermaking, textile, building materials, chemical weaving, leather and other industries. A chemical raw material such as barium sulfate can also be used as a filler for synthetic detergents, etc., but there are problems such as low price and low added value for industrial use. At the same time, there is a large amount of sodium sulfate waste liquid discharged in the fields of metallurgy, papermaking, and chemical industry, which requires high economic value treatment. [0003] After a large amount of acid liquid leaching metals in metallurgical plants, the waste liquid will be neutralized with N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054C01B17/62
CPCC01B17/62H01M4/5825H01M10/054Y02E60/10
Inventor 张治安赖延清陈晓彬李煌旭李军明尚国志肖志伟李劼
Owner CENT SOUTH UNIV
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