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Automatic purifying method for spherical graphite

A technology of spherical graphite and purification method, which is applied in the field of graphite production equipment, can solve the problems of high corrosion of equipment and normal hydrofluoric acid, etc., and achieve the effects of complete chemical reaction, accelerated reaction speed and convenient operation

Inactive Publication Date: 2015-04-29
营口博田材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After treatment with dilute acid at 100°C for 2 hours, and then with fluoride solution at about 70°C for 2.5 hours, the purity of graphite will increase to 99.8-99.93%. However, fluoride solution is prone to produce hydrofluoric acid, which is extremely corrosive to equipment. Big

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Put 4 tons of spherical graphite materials with SG17 specifications into the primary reaction tank, add 2 tons of demineralized water, add 800 kg of ammonium fluoride, add 200 kg of EDTA, start stirring and heat for two hours with steam until the temperature of the materials reaches above 80 degrees , stop heating, close the tank mouth, stop stirring, let stand for reaction, the temperature must be kept above 80 degrees, and the reaction time is 12 hours; after the reaction, open the bottom discharge valve, turn on the slurry pump, and put the material into a filter press first. Press filtration, open the high-pressure air valve, remove the acid liquid, then close the air valve, open the softened water valve, clean the material until the pH value is greater than 4, close the softened water valve, open the high-pressure air valve, and dehydrate the material to the water content If it is less than 30%, close the air valve, open the filter plate of the filter press, unload ...

example 2

[0032] Put 6 tons of spherical graphite SG22 material into the primary reaction tank, add 3 tons of demineralized water, add 1600 kg of ammonium bifluoride, add 400 kg of EDTG, start stirring and heat for two hours with steam, until the temperature of the material reaches 80 degrees or more, Stop heating, stop stirring, seal and stand for reaction, the temperature must be kept above 80 degrees, and the reaction time is 12 hours; after the reaction is completed, open the bottom discharge valve, open the slurry pump, put the material into a filter press, press filter first, and open High-pressure air valve, deacidification, then close the air valve, open the softened water valve, clean the material until the pH value is greater than 4, close the softened water valve, open the high-pressure air valve, dehydrate the material until the water content is less than 30%, and stop the gas supply , open the filter plate of the filter press, unload the material and send it to the slurry ta...

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Abstract

The invention discloses a purifying method for spherical graphite. The automatic purifying method for the spherical graphite comprises the following steps: adding the spherical graphite, fluoride, a complexing agent and water into a primary reaction tank, uniformly stirring, introducing steam, heating for 3h, and carrying out reaction for 8-12h at the temperature of 80-120 DEG C; after reaction, pumping a material into a primary filter press through a pipeline at the bottom by virtue of a material conveying pump, carrying out filtration and deacidification, collecting waste acid liquid into an acid storage tank for secondary reserve, introducing soft water, and cleaning the material to be neutral; sending the material discharged by the primary filter press into a middle pulping tank by virtue of a spiral material conveying device; adding aqua regia and water into the middle pulping tank according to a certain ratio, and stirring until the material is in a gruel shape, and pumping the material into a secondary reaction tank by virtue of the material conveying pump; introducing the steam, heating, and carrying out reaction for 4-8h at the temperature of 80-120 DEG C; after reaction, discharging the material, enabling the material to enter a secondary filter press by virtue of the material conveying pump, carrying out filtration and deacidification, collecting concentrated acid liquid into an acid storage tank, introducing deionized water, cleaning the material to be neutral, and drying the discharged material to obtain the high-purity spherical graphite, wherein the purity of the spherical graphite can achieve 99.99-99.995 percent.

Description

technical field [0001] The invention relates to graphite production equipment, in particular to a purification technology of spherical graphite. Background technique [0002] With the widespread application of lithium-ion secondary batteries, the technology of spherical graphite made of natural flake graphite for lithium-ion secondary batteries is becoming more and more mature. Its high specific capacity and long cycle life are unmatched by many other materials; but Spherical graphite has to go through two processes in the production process, one is the process of pulverizing the ball, that is, a physical process; the other is the process of improving the purity, which is a chemical process. Among them, the chemical process is the most complicated. It needs to use a variety of acids to remove various impurities and carry out chemical reactions many times. The current purification methods in the industry are different, but there are incomplete and unreasonable processes in th...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 林庆财赵刚赵振宇
Owner 营口博田材料科技有限公司
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