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
View PDF2 Cites 4 Cited by
  • 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 wi

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1:

[0030] Put 4 tons of spherical graphite specification SG17 into the primary reaction tank, add 2 tons of demineralized water, add 800 kilograms of ammonium fluoride, add 200 kilograms of EDTA, turn on the stirring and steam heating for two hours, until the material temperature reaches 80 degrees or more , Stop heating, close the tank mouth, stop stirring, let stand the reaction, the temperature must be kept above 80 degrees, the reaction time is 12 hours; after the reaction, open the bottom discharge valve, turn on the slurry pump, and feed the material into the primary filter press. Press filter, open the high-pressure air valve to remove the acid liquid, then close the air valve, open the softened water valve, and clean the material until the PH value is greater than 4, close the softened water valve, open the high-pressure air valve, and the material is dehydrated to moisture content If it is less than 30%, close the air valve, open the filter plate of the ...

Example Embodiment

[0031] Example 2:

[0032] Put 6 tons of spherical graphite specification SG22 into the primary reaction tank, add 3 tons of demineralized water, add 1600 kg of ammonium bifluoride, add 400 kg of EDTG, turn on the stirring and heat it with steam for two hours, and wait until the material temperature reaches 80 degrees or more. Stop heating, stop stirring, keep the reaction closed, the temperature must be kept above 80 degrees, the reaction time is 12 hours; when the reaction is over, open the bottom discharge valve, open the slurry pump, and feed the material into the primary filter press first, filter and open High-pressure air valve, deacidification, then close the air valve, open the softened water valve, and clean the material until the PH value is greater than 4, close the softened water valve, open the high-pressure air valve, the material is dehydrated until the water content is less than 30%, stop the gas supply , Open the filter plate of the filter press, unload the mate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap