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Microcrystalline graphite high temperature pretreatment-alkaline acid method purification method

A technology of microcrystalline graphite and purification method, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of low effect, and achieve the effect of improving recovery rate, improving alkali leaching efficiency, and reducing alkali leaching temperature

Inactive Publication Date: 2018-01-09
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the present invention is suitable for microcrystalline graphite with a carbon content of more than 77%, and the effect of purifying to a fixed carbon content of more than 95% is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1. The microcrystalline graphite ore with a carbon content of 70% is crushed and ground to a particle size of 100 mesh;

[0028] S2. heat-treating the finely ground microcrystalline graphite powder obtained in step S1 at 500° C. for 3 minutes;

[0029] S3. Mix the mineral after the heat treatment in step S2 with 20% sodium hydroxide solution while it is hot, and carry out pressurized alkaline leaching under the conditions of a liquid-solid ratio of ore slurry of 10:1, a temperature of 100°C, a reaction time of 2 hours, and a pressure of 0.6 MPa. The leached slag was washed with water and dried at 80°C for 3 hours to obtain alkali leached graphite;

[0030] S4. After mixing the alkali leached graphite and 10% HCl solution obtained in step S3, carry out acid leaching at normal pressure under the conditions of slurry liquid-solid ratio 10:1, temperature 110°C, and reaction time 3h, and the leached slag is washed with water and heated at 80°C. After drying for 3 hours, a ...

Embodiment 2

[0032] S1. The microcrystalline graphite ore with a carbon content of 82.8% is crushed and ground to a particle size of 140 mesh;

[0033] S2. heat-treating the finely ground microcrystalline graphite powder obtained in step S1 at 600° C. for 3 minutes;

[0034] S3. Mix the mineral after the heat treatment in step S2 with 10% sodium hydroxide solution while it is hot, and carry out pressurized alkaline leaching under the conditions of a liquid-solid ratio of ore slurry of 12:1, a temperature of 110°C, a reaction time of 2 hours, and a pressure of 0.6 MPa. The leached slag was washed with water and dried at 80°C for 3 hours to obtain alkali leached graphite;

[0035] S4. After mixing the alkali leached graphite and 10% HCl solution obtained in step S3, carry out acid leaching at normal pressure under the conditions of slurry liquid-solid ratio 10:1, temperature 114°C, and reaction time 2h. After drying for 3 hours, a microcrystalline graphite product with a fixed carbon conten...

Embodiment 3

[0037] S1. The microcrystalline graphite ore with a carbon content of 84.6% is crushed and ground to a particle size of 200 mesh;

[0038] S2. heat-treating the finely ground microcrystalline graphite powder obtained in step S1 at 800° C. for 3 minutes;

[0039] S3. Mix the mineral after the heat treatment in step S2 with 10% sodium hydroxide solution while it is hot, and carry out pressurized alkaline leaching under the conditions of ore slurry liquid-solid ratio 11:1, temperature 115°C, reaction time 2.5h, and pressure 0.8 MPa , the leached slag was washed with water and dried at 80°C for 3 hours to obtain alkali leached graphite;

[0040] S4. After mixing the alkali leached graphite and 10% HCl solution obtained in step S3, carry out acid leaching at normal pressure under the conditions of slurry liquid-solid ratio 11:1, temperature 115°C, and reaction time 2.5h. The leached residue is washed with water and heated at 100°C. After drying at high temperature for 3 hours, a m...

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Abstract

The invention belongs to the technical field of microcrystalline graphite purification, and more specifically relates to a microcrystalline graphite high temperature pretreatment-alkaline acid methodpurification method. The microcrystalline graphite high temperature pretreatment-alkaline acid method purification method comprises following steps: microcrystalline graphite ore is subjected to smashing and grinding to a certain particle size; high temperature heat treatment is adopted; after heat treatment, the obtained microcrystalline graphite is subjected to pressurization alkaline leaching and normal pressure acid leaching so as to obtain microcrystalline graphite finished products. According to the microcrystalline graphite high temperature pretreatment-alkaline acid method purificationmethod, pressurization alkaline leaching is adopted to replace high temperature calcining, after heat treatment, alkaline leaching temperature in alkaline acid method purification process of microcrystalline graphite can be reduced, alkaline leaching efficiency is increased, energy consumption is reduced, and graphite recovery rate is increased. The microcrystalline graphite high temperature pretreatment-alkaline acid method purification method is capable of increasing microcrystalline graphite fixed carbon content to be 98% or higher.

Description

technical field [0001] The invention belongs to the technical field of purification of microcrystalline graphite, and more specifically relates to a novel purification method of microcrystalline graphite. Background technique [0002] Graphite is a high-energy crystalline carbon material, widely used in metallurgy, machinery, environmental protection, chemical industry, refractory, new energy, nuclear energy, electronics, fields such as medicine, military industry and aerospace. [0003] my country's natural graphite has good geological conditions, wide distribution, rich resources and good quality. Its reserves and output rank first in the world, and it is one of my country's advantageous minerals. Natural graphite can be divided into crystalline graphite and microcrystalline graphite according to the degree of crystallization. [0004] For a long time, people have mostly paid attention to the mining and processing of crystalline graphite, and neglected the development an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215
Inventor 李丽萍林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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