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Method for treating waste salt in graphite oxide production process by thermal crystallization method

A production process and thermal crystallization technology, applied in the preparation of sulfate/bisulfate, manganese sulfate, etc., can solve the problems of complex process, large consumption of precipitant, and many steps, and achieve the effect of simple process technology

Pending Publication Date: 2021-03-26
南通第六元素材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to consume a large amount of precipitant, and the resource utilization of manganese requires many steps and the process is complicated

Method used

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  • Method for treating waste salt in graphite oxide production process by thermal crystallization method
  • Method for treating waste salt in graphite oxide production process by thermal crystallization method
  • Method for treating waste salt in graphite oxide production process by thermal crystallization method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0055] A kind of thermal crystallization method of the present invention handles the method step of waste salt in graphite oxide production process as follows:

[0056] Get the waste salt (on-site actual sampling) 100g that produces in graphite oxide treatment process, wherein the massfraction of sulfuric acid 36.2%, manganese sulfate 32%, potassium sulfate 17%, water 14.8%.

[0057] 1. Raw material pretreatment: Add 300ml of water to the raw material, stir for 15 minutes until the raw material is completely dissolved, and the solution is reddish.

[0058] 2. Neutralization reaction: under normal temperature and pressure, slowly add 50 g of solid manganese carbonate (industrial grade) to the filtered solution, and measure the pH of the solution to be 5 after adding. The feeding time is controlled to 45min. During the neutralization process, some impurities will be precipitated (at this time, the impurities are mainly insolubles in industrial manganese carbonate). After the ne...

Embodiment 2

[0068] A kind of thermal crystallization method of the present invention handles the method step of waste salt in graphite oxide production process as follows:

[0069] Get 100g of waste salt (on-site actual sampling) produced in the graphite oxide treatment process, wherein the mass fraction of sulfuric acid is 46.7%, manganese sulfate 22.5%, potassium sulfate 12%, water 18.8%.

[0070] 1. Raw material pretreatment: Add 300ml of water to the raw material, stir for 15 minutes until the raw material is completely dissolved, and the solution is reddish.

[0071] 2. Neutralization reaction: under normal temperature and pressure, slowly add 63g of solid manganese carbonate (industrial grade) to the filtered solution, and measure the pH of the solution to be 5. Adding time is controlled at 40min. During the neutralization process, some impurities will be precipitated (at this time, the impurities are mainly insolubles in industrial manganese carbonate). After the neutralization is...

Embodiment 3

[0081] A kind of thermal crystallization method of the present invention handles the method step of waste salt in graphite oxide production process as follows:

[0082] Get the waste salt (on-site actual sampling) 1000g that produces in graphite oxide treatment process, wherein the massfraction of sulfuric acid 36.2%, manganese sulfate 32%, potassium sulfate 17%, water 14.8%.

[0083] 1. Raw material pretreatment: Add 3000ml of water to the raw material, stir for 15 minutes until the raw material is completely dissolved, and the solution is reddish.

[0084] 2. Neutralization reaction: under normal temperature and pressure, slowly add 495g of solid manganese carbonate (industrial grade) to the filtered solution, and measure the pH of the solution to be 5. Adding time is controlled at 40min. During the neutralization process, some impurities will be precipitated (at this time, the impurities are mainly insolubles in industrial manganese carbonate). After the neutralization is ...

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Abstract

The invention provides a method for treating waste salt in a graphite oxide production process by a thermal crystallization method, which comprises the following steps: (1) dissolving the waste salt generated in the graphite oxide production process with water, adding solid manganese carbonate into the solution to carry out neutralization reaction, filtering and collecting the filtrate, (2) putting the filtrate obtained in the step (1) into a pressure reaction kettle, slowly heating to the temperature of 190200 DEG C in the kettle, keeping the temperature, standing, quickly filtering while thefiltrate is hot, and drying the solid phase to obtain manganese sulfate, and (3) adding excessive potassium carbonate into the solution obtained in the step (2), filtering, adding concentrated sulfuric acid into the filtrate, and carrying out evaporative crystallization on the neutralized solution to obtain potassium sulfate. According to the method, the waste salt is changed into agricultural-grade manganese sulfate and agricultural-grade potassium sulfate. The whole treatment process is relatively simple, water is recycled, and no new pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt treatment of graphite oxide, and in particular relates to a method for treating waste salt produced in the production process of graphite oxide by thermal crystallization. Background technique [0002] The preparation of graphite oxide by redox method usually uses concentrated sulfuric acid and potassium permanganate to treat graphite raw materials. After the reaction is completed, the reactants are purified, washed, and solid-liquid separated to obtain graphite oxide products. In the production process, there will be produced by sedimentation containing K 2 SO 4 , MnSO 4 , sulfuric acid (free acid, solid-liquid separation entrainment)-based waste salt and a large amount of K + , Mn 2+ , H 3 o + , SO 4 2- of acidic wastewater. A large amount of K 2 SO 4 , MnSO 4 , Sulfuric acid (free acid, solid-liquid separation entrainment)-based waste salt. Generally speaking, waste salt fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/10C01D5/06
CPCC01G45/10C01D5/06C01P2006/80
Inventor 郭宁祁琳瞿研
Owner 南通第六元素材料科技有限公司