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Microcrystalline graphite purification preparation process

A preparation process and technology of microcrystalline graphite, applied in inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problems of high cost, long time, complicated operation method, etc., and achieve the effect of low cost and stable quality

Inactive Publication Date: 2017-06-23
福建凯昱微晶石墨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method of operation is too complicated, costly and time-consuming

Method used

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specific Embodiment approach

[0012] A purification and preparation process of microcrystalline graphite, taking 40 to 50 parts by weight of natural microcrystalline graphite with a particle size of 200 mesh to 3000 mesh and a purity of 80% to 90%, adding 30 to 42 parts by weight of natural microcrystalline graphite that does not contain Ca 2+ , Mg 2+ , Stir the pure water of CL-impurity ions evenly into a paste, then add 4-8 parts by weight of strong acid, heat at 40°C-100°C and stir for 4-6 hours, then filter and wash the filter cake pH value with water To neutral, dry to obtain natural graphite with a purity greater than 99.990%.

[0013] The strong acid of the present invention is one or a mixture of hydrochloric acid, phosphoric acid, sulfuric acid, hydrofluoric acid and nitric acid.

[0014] The purpose of adding strong acid in the present invention is to utilize acid and impurity reaction to generate water-soluble ions, dissolve and remove impurity components in graphite; the particle size range o...

Embodiment 1

[0018] Get natural microcrystalline graphite ore powder 400Kg (raw material purity 85%), add water (with the non-Ca that is processed through ion-exchange resin 2+ , Mg 2+ , CL- and other impurity ions) 300kg, stir well to make it into a paste, then add 80kg hydrochloric acid, heat at 60°C and stir for 5 hours, after filtration, recover 23.5kg of chemical reagents, consume 56.5kg, filter cake pH Value washed to neutral, dried to obtain finished product 336kg, recovery rate 84%, product purity 99.995%.

Embodiment 2

[0020] Get microcrystalline spheroidized graphite 500kg, particle size 800 orders (96% of carbon content) add water (utilize through ion-exchange resin treatment and do not contain Ca 2+ , Mg 2+ , CL- and other impurity ions) 420kg, stir well to make it into a paste, then add sulfuric acid and 40kg, heat at 60°C and stir for 5 hours, after washing and filtering, recover 5.8kg of chemical reagents, consume 34.2kg, filter The pH value of the cake was washed with water until neutral, and dried to obtain a product with a purity of 99.992%, 477.5 kg of the product, and a recovery rate of 95.5%.

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Abstract

The invention discloses a microcrystalline graphite purification preparation process which comprises the following steps: adding 40-50 parts by weight of natural microcrystalline graphite of which the granularity is 200-3000 meshes and the purity is 80-90% into 30-42 parts by weight of pure water which is free of impurity ions such as Ca<2+>, Mg<2+> and CL<->, uniformly stirring till paste is formed, further adding 4-8 parts by weight of strong acid, heating to 40-100 DEG C, performing stirring reaction for 4-6 hours, filtering, washing filter cakes with water till the pH value is neutral, and drying, thereby obtaining the natural graphite of which the purity is greater than or equal to 99.990%. The high-purity natural graphite which is 99.990-99.998% after being purified according to a liquid-phase chemical method can meet use requirements of high-tech fields such as the atomic energy industry and the space technology, and is low in cost and stable in quality.

Description

technical field [0001] The invention relates to the technical field of purification of microcrystalline graphite, in particular to a purification and preparation process of microcrystalline graphite. Background technique [0002] As an industrial raw material, graphite plays an important role in some special industries or high-tech fields, such as atomic energy industry, automobile industry, aerospace technology, biotechnology and other industries. The carbon content of graphite used in these industries must be high-purity graphite with a carbon content of more than 99.9%, while the carbon content of natural graphite after general mineral processing is as high as 96%, which is far from meeting the requirements of high-purity industries. Natural graphite for purification. [0003] The current purification method for natural graphite is to use high-temperature electrothermal method to improve the purity of graphite. Volatilize to obtain high-purity graphite with more than 99...

Claims

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Application Information

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IPC IPC(8): C01B32/215
CPCC01P2006/80
Inventor 林锋余常伟张杨健
Owner 福建凯昱微晶石墨有限公司
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