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Method for removing sulfuric acid from expandable graphite

A technology of expanded graphite and sulfuric acid, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as high washing water consumption and sewage discharge, no solution for wastewater treatment, and restrictions on the development of the industry , to achieve the effect of facilitating sewage treatment, reducing washing water consumption and sewage discharge, and promoting development

Active Publication Date: 2017-01-11
陈连捷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pH value of the expandable graphite prepared by this method is above 2. In order to meet the requirements of the product, it is also necessary to wash the expandable graphite with water to make the pH value above 3, which results in a large amount of washing water and sewage discharge. At the same time, the acid water produced in the washing process contains a large amount of suspended solids that pollute the environment, and most manufacturers are in a state of natural discharge, and there are no measures to solve the waste water treatment, causing environmental pollution and seriously restricting the development of the industry

Method used

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  • Method for removing sulfuric acid from expandable graphite

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Embodiment 1

[0023] A method for removing sulfuric acid in expandable graphite, comprising the steps of:

[0024] (1) Pour 599 graphite into sulfuric acid with a mass fraction of 98% and mix and stir for 23 minutes, then add hydrogen peroxide with a mass fraction of 35%, and mix and react for 33 minutes to obtain primary expandable graphite, wherein 599 graphite is mixed with the sulfuric acid and the The weight ratio of hydrogen peroxide is 90:180:11.7;

[0025] (2) Suction filtering the primary expandable graphite to remove the acid impregnated in the expandable graphite for the first time to obtain an expandable graphite cake;

[0026] (3) The expandable graphite cake is baked at a constant temperature for the first stage at a temperature of 100° C. After baking for 8 hours, the expandable graphite cake is washed with water to neutrality, and then centrifugally dehydrated at a speed of 800 r / min After dehydration for 6 minutes, continue to bake at a temperature of 100°C for the second ...

Embodiment 2

[0028] A method for removing sulfuric acid in expandable graphite, comprising the steps of:

[0029] (1) Pour 599 graphite into 98% sulfuric acid and mix and stir for 20 minutes, then add hydrogen peroxide with a mass fraction of 42.5%, and mix and react for 30 minutes to obtain primary expandable graphite, wherein 599 graphite is mixed with the sulfuric acid and the The weight ratio of hydrogen peroxide is 100:200:13;

[0030] (2) Suction filtering the primary expandable graphite to remove the acid impregnated in the expandable graphite for the first time to obtain an expandable graphite cake;

[0031] (3) The expandable graphite cake is baked at a constant temperature for the first stage at a temperature of 220° C. After baking for 9 hours, the expandable graphite cake is washed with water to neutrality, and then centrifugally dehydrated at a speed of 1000 r / min After dehydration for 5 minutes, continue to bake at a temperature of 220°C for the second stage of constant temp...

Embodiment 3

[0033] A method for removing sulfuric acid in expandable graphite, comprising the steps of:

[0034] (1) Pour 599 graphite into 98% sulfuric acid and mix and stir for 25min, then add 50% hydrogen peroxide, mix and react for 35min to obtain primary expandable graphite, wherein 599 graphite is mixed with the sulfuric acid and the The weight ratio of hydrogen peroxide is 110:220:14.3;

[0035] (2) Suction filtering the primary expandable graphite to remove the acid impregnated in the expandable graphite for the first time to obtain an expandable graphite cake;

[0036] (3) The expandable graphite cake is baked at a constant temperature for the first stage at a temperature of 240° C. After baking for 10 hours, the expandable graphite cake is washed with water to neutrality, and then centrifugally dehydrated at a speed of 1200 r / min After dehydration for 4 minutes, continue to bake at a constant temperature of 240°C for the second stage. After baking for 10 hours, the finished exp...

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Abstract

The invention relates to a method for removing sulfuric acid from expandable graphite. The method includes the steps of (1), subjecting oxidized primary expandable graphite to suction filtration to primarily remove acid permeated into the expandable graphite so as to obtain expandable graphite cakes; (2), subjecting the expandable graphite cakes to primary constant-temperature roasting at 100-240 DEG C, drying prior to washing and dehydration, subjecting the treated expandable graphite cakes to secondary constant-temperature roasting at 100-240 DEG C and drying so as to obtain an expandable graphite finished product with a pH value more than 5. The method for removing the sulfuric acid from the expandable graphite has the advantages that the method is capable of removing the sulfuric acid from the expandable graphite effectively and reducing washing water consumption and wastewater drainage quantity effectively while the expansion volume and the sulphur content of the finished product are guaranteed, so that subsequent wastewater treatment is facilitated, environmental pollution caused by production processes of the expandable graphite industry is effectively reduced, and development of the expandable graphite industry is promoted.

Description

technical field [0001] The invention belongs to the field of preparation of expandable graphite, and in particular relates to a method for effectively deacidifying when preparing expandable graphite. Background technique [0002] Graphite crystals have a hexagonal network planar layered structure composed of carbon elements, and the layers are combined by van der Waals force, the combination is very weak, and the distance between layers is large. Therefore, under appropriate conditions, various chemical substances such as acids, alkali metals, and salts can be inserted between graphite layers and combine with carbon atoms to form a new chemical phase-graphite intercalation on compounds (Graphite Intercalation on Compounds, GIC for short). When this interlayer compound is heated to an appropriate temperature, it can decompose rapidly in an instant, producing a large amount of gas, which makes the graphite expand into a new worm-like substance along the axis, that is, expanded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225
CPCC01P2006/80
Inventor 陈连捷
Owner 陈连捷