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Method for preparing high-purity graphite at high temperature and under vacuum

A high-purity graphite, high-temperature vacuum technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of high production cost, high energy consumption, high pollution, etc., and achieve low equipment requirements, low energy consumption and, Yield-enhancing effect

Active Publication Date: 2019-09-20
钢研晟华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the above analysis, the present invention aims to provide a method for preparing high-purity graphite in high-temperature vacuum to solve the problems of high energy consumption, high pollution process, low production capacity and high production cost in the purification process of graphite powder in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The main components (dry basis) of the raw graphite powder used are shown in Table 1.

[0052] The composition / wt% of raw material graphite powder of table 1

[0053] C Al 2 o 3

CaO Fe 2 o 3

K 2 o

P 2 o 5

Rb 2 o

SO 3

SiO 2

MgO margin 0.14 0.11 0.32 0.083 0.086 0.0009 0.12 0.49 0.05

[0054] In the first step, dextrin is used as the binder, and the amount of the binder added is 3% of the mass of the graphite powder, and small balls of 1 mm to 20 mm are formed through high-speed rotary granulation, and the unqualified ones are remolded;

[0055] High-speed rotary granulation is continuous feeding and discharging. The dextrin and graphite powder are mixed in the conical mixer for 30-60 minutes, then added to the high-speed rotary granulator, and sprayed with water quantitatively, so that the dextrin and graphite powder can be quickly Bonded into small balls, the speed of the high-speed rotary gr...

Embodiment 2

[0060] The main components (dry basis) of the graphite raw materials used are shown in Table 2.

[0061] The composition / wt% of raw material graphite powder of table 2

[0062] C Al 2 o 3

CaO Fe 2 o 3

K 2 o

P 2 o 5

Rb 2 o

SO 3

SiO 2

MgO margin 0.67 0.55 0.45 0.092 0.012 0.001 0.15 1.02 0.35

[0063] In the first step, bentonite is selected as the binder, and the amount of the bentonite binder is 2.5% of the mass of the graphite powder. Form pellets of 1mm to 20mm through a disc pelletizer;

[0064] The disc pelletizing machine is continuous feeding and discharging. Bentonite and graphite powder are mixed in the conical mixer for 30-60 minutes, then added to the disc pelletizing machine, and quantitatively sprayed with water, so that bentonite and graphite powder can be rapidly formed. , The speed of the disc granulator is about 20-50 revolutions per minute, and the forming rate of graphite pellets ...

Embodiment 3

[0069] The graphite raw material composition (dry basis) used is shown in Table 2.

[0070] In the first step, a mixed binder of water glass and dextrin is selected, and the dosages of water glass and dextrin are respectively 1.5% and 1% of the graphite powder mass. Formed by a rolling ball machine to form an ellipsoid, a small ball with an equivalent diameter of 15mm;

[0071] The rolling ball machine is continuous feeding and discharging. The water glass, dextrin and graphite powder are mixed in the conical mixer for 30-60 minutes, then added to the rolling ball machine, and quantitatively sprayed with water, so that the material can be formed quickly. The speed of the rolling ball machine is about 5 to 20 revolutions per minute, and the molding rate of graphite balls is high at this speed.

[0072] The second step is to dry the formed graphite pellets with tunnel drying equipment at a drying temperature of 130-150°C and a drying time of 100-200 minutes to reduce the moistu...

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Abstract

The invention discloses a method for preparing high-purity graphite at a high temperature and under vacuum, and belongs to the technical field of preparation of ultra-pure graphite, solving the problems of high energy consumption, high pollution, low productivity and high production cost in a purification process of graphite powder in the prior art. The method includes the following steps: S1, making raw graphite powder into balls or blocks; S2, drying formed graphite; S3, performing graphite purification in a high-temperature vacuum furnace; S4, discharging the high-purity graphite. The method is suitable for the preparation of the high-purity graphite.

Description

technical field [0001] The invention belongs to the technical field of ultra-pure graphite preparation, in particular to a method for preparing high-purity graphite in high-temperature vacuum. Background technique [0002] Graphite is a high-energy crystalline carbon material. Because of its unique structure, electrical conductivity, thermal conductivity, lubrication, high temperature resistance, and stable chemical properties, it has high application value in high-performance materials and is widely used in metallurgy, machinery, In the fields of environmental protection, chemical industry, refractory, electronics, medicine, military industry and aerospace, it has become an indispensable non-metallic material for the development of modern industry and high, new and cutting-edge technology. [0003] Graphite purification is to take effective means to remove impurities. Graphite purification includes chemical purification and physical purification. Chemical purification incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 郭培民赵沛孔令兵王磊
Owner 钢研晟华科技股份有限公司
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