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Method for processing waste sulfuric acid in graphene production process

A technology of production process and treatment method, applied in the field of comprehensive utilization of industrial waste sulfuric acid, can solve problems such as environmental pollution, consumption of large manpower and material resources, waste of resources, etc., and achieve the effects of improving environmental quality, eliminating pollution sources and simple process

Active Publication Date: 2014-04-02
山东金利特新材料有限责任公司
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Problems solved by technology

[0002] Type here Technical Field Description Paragraph In the process of industrial production, waste acid pollutants will inevitably be produced due to technological requirements. The random discharge of these waste acids is not only a waste of resources, but also causes serious environmental pollution and social impact. , at present, the general sewage treatment method cannot handle it very well. The existing waste acid disposal method mainly adopts the method of acid-base neutralization. This method needs to consume the same amount of alkali in the process of disposing of waste acid. At the same time, a certain amount of salt and a large amount of waste water will be produced. The disposal of these follow-up substances still needs to consume a lot of manpower and material resources, and there is a hidden danger of secondary pollution.

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  • Method for processing waste sulfuric acid in graphene production process

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Effect test

Embodiment 1

[0021] After the waste sulfuric acid was collected, it was left to settle for 3 days, and then filtered to remove particulate matter and other inorganic salt ions. After concentration, waste concentrated sulfuric acid with a concentration of 96% was obtained, and waste concentrated sulfuric acid was mixed with water to obtain 20% waste dilute sulfuric acid.

[0022] (1) Add 10 ml of 0.05mol / L calcium oxide solution into the flask, and add 10% dilute sulfuric acid at a ratio of 3:0.1 between calcium ions and sulfate ions, and stir for 30 min.

[0023] (2) Then add magnesium chloride hexahydrate according to the ratio of calcium ion to magnesium ion 40:1.

[0024] (3) Then add 10% dilute sulfuric acid at the ratio of calcium ion and sulfate ion at a ratio of 1:50, and react in an oil bath at 100 °C for 100 min.

[0025] (4) After the reaction, filter, dissolve the filter cake in water and let stand for 2 h, filter again, wash and dry to obtain calcium sulfate whiskers.

Embodiment 2

[0027] After the waste sulfuric acid was collected, it was left to settle for 2 days, and then filtered to remove particulate matter and other inorganic salt ions. After concentration, the waste concentrated sulfuric acid with a concentration of 96% was obtained, and the waste concentrated sulfuric acid was mixed with water to obtain 40% waste dilute sulfuric acid.

[0028] (1) Add 50 ml of 0.15mol / L calcium oxide solution into the flask, and add 40% dilute sulfuric acid at a ratio of 1:1 between calcium ions and sulfate ions, and stir for 100 min.

[0029] (2) Then add magnesium chloride hexahydrate according to the ratio of calcium ion to magnesium ion 30:1.

[0030] (3) Then add 40% dilute sulfuric acid at a ratio of 1:30 of calcium ions and sulfate ions, and react in an oil bath at 150°C for 200 minutes.

[0031] (4) After the reaction is completed, filter, dissolve the filter cake in water and let it stand for 10 hours, then filter again, wash and dry to obtain calcium su...

Embodiment 3

[0033] After the waste sulfuric acid was collected, it was left to settle for 1 day, and then filtered to remove particulate matter and other inorganic salt ions. After concentration, the waste concentrated sulfuric acid with a concentration of 96% was obtained, and the waste concentrated sulfuric acid was mixed with water to obtain 20% waste dilute sulfuric acid.

[0034] (1) Add 100 ml of 0.30mol / L calcium oxide solution to the flask, and add 75% dilute sulfuric acid at a ratio of 1:30 between calcium ions and sulfate ions, and stir for 300 min.

[0035] (2) Then add magnesium chloride hexahydrate according to the ratio of calcium ion to magnesium ion 20:1.

[0036] (3) Then add 75% dilute sulfuric acid at a ratio of calcium ion and sulfate ion at a ratio of 1:15, and react in an oil bath at 200°C for 360 minutes.

[0037] (4) After the reaction is completed, filter, dissolve the filter cake in water and let it stand for 18 hours, then filter again, wash and dry to obtain ca...

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Abstract

The invention discloses a method for processing waste sulfuric acid in a graphene production process. The method is characterized by comprising the following steps: collecting the waste sulfuric acid, filtering and settling the waste sulfuric acid to obtain the transparent sulfuric acid, diluting the waste sulfuric acid with water to obtain a dilute sulfuric acid solution, and utilizing the obtained dilute sulfuric acid solution to synthesize calcium sulfate crystal whiskers. The waste sulfuric acid can be utilized to prepare the calcium sulfate crystal whiskers in the graphene production process, so that the pollution source can be eliminated; the environment can be obviously improved; the method benefits generation by generation, turns waste into valuable things, can achieve obvious economic benefits, and is simple in process and easy to operate.

Description

technical field [0001] Type here technical field description paragraph The present invention relates to the comprehensive utilization technology of industrial waste sulfuric acid, specifically a kind of method for the comprehensive utilization of waste sulfuric acid produced in the graphene production process to produce calcium sulfate whiskers. Background technique [0002] Type here Technical Field Description Paragraph In the process of industrial production, waste acid pollutants will inevitably be produced due to technological requirements. The random discharge of these waste acids is not only a waste of resources, but also causes serious environmental pollution and social impact. , at present, the general sewage treatment method cannot handle it very well. The existing waste acid disposal method mainly adopts the method of acid-base neutralization. This method needs to consume the same amount of alkali in the process of disposing of waste acid. At the same time, a cer...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B29/62C30B7/14
Inventor 许守勇曹飞朱军侯士峰
Owner 山东金利特新材料有限责任公司
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