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Method for purifying high-purity graphite

A high-purity graphite and graphite technology, applied in the field of high-purity graphite, can solve the problems of poor impurity removal effect and high energy consumption, and achieve the effects of low environmental pollution, low energy consumption and good safety

Inactive Publication Date: 2011-02-16
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These production methods have more or less shortcomings such as poor impurity removal effect, high energy consumption, and serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using flake graphite with a carbon content of 10wt% as raw material, the raw material is successively crushed by a crusher, ball milled by a ball mill, and the graphite powder is sieved by a sieving machine to obtain a graphite powder with a particle size of 150 mesh, and then use a flotation device for its Perform preliminary impurity removal to obtain graphite concentrate.

[0018] Use NaOH solution with a concentration of 5% to carry out alkali leaching treatment to graphite concentrate in a pressurized reactor according to the weight part of liquid-solid ratio of 1:1, control the reaction temperature to be 110-130°C, and the reaction pressure to be 25MPa. for 12h. The reacted material was separated from solid and liquid, and washed with pure water until pH=7. The material after the reaction is that the hydrochloric acid solution of 10% is carried out acid leaching treatment according to the weight portion of 8: 1 according to the liquid-solid ratio with the concent...

Embodiment 2

[0021] Using flake graphite with a carbon content of 15wt% as raw material, the raw material is successively crushed by a crusher, ball milled by a ball mill, and the graphite powder is sieved by a sieving machine to obtain a graphite powder with a particle size of 250 mesh, and then use a gravity separation device to Perform preliminary impurity removal to obtain graphite concentrate.

[0022] With a concentration of 30% KOH and 20% Na 2 CO 3 The mixed solution carries out alkaline leaching treatment on the graphite concentrate in a pressurized reactor according to the weight part of liquid-solid ratio of 5:1, the reaction temperature is controlled at 180-200° C., the reaction pressure is 15 MPa, and the treatment time is 6 hours. The reacted material was separated from solid and liquid, and washed with pure water until pH=7. The material after reaction is that the nitric acid solution of 15% is carried out acid leaching treatment according to the weight part that liquid-so...

Embodiment 3

[0024] Cryptocrystalline graphite with a carbon content of 30wt% is used as a raw material. The raw materials are crushed in a crusher and ball milled in a ball mill in turn, and the graphite powder is sieved by a sieving machine to obtain a graphite powder with a particle size of 350 mesh, and then the gravity separation equipment is used for preliminary removal of impurities to obtain graphite concentrate.

[0025] The concentration is 25% LiOH and 5% KOH mixed solution according to the liquid-solid ratio is 8: 1 weight portion carries out alkaline leaching treatment to graphite concentrate in the pressurized reaction kettle, and the control reaction temperature is 250~280 ℃, reaction The pressure is 20MPa, and the treatment time is 4h. The reacted material was separated from solid and liquid, and washed with pure water until pH=7. The material after reaction is that the hydrochloric acid solution of 20% and the sulfuric acid of 15% and the acetic acid mixed solution of 30%...

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Abstract

The invention discloses a method for purifying high-purity graphite, which aims to effectively remove impurities from the graphite and make 99.99 percent the fixed carbon content of the graphite. The method comprises the following steps of: performing the steps of crushing, ball-milling, sieving and the like on raw graphite ore and performing ore-dressing on the treated graphite ore by adopting floatation equipment or gravity dressing equipment to obtain graphite concentrate; performing alkali leaching on the graphite concentrate in a pressurized reaction kettle and then performing normal-pressure acid leaching in an ultrasonic wave field or a microwave field; and leaching treated graphite powder by using a hydrofluoric acid or fluoride salt-containing sodium fluoride to obtain the high-purity graphite product.

Description

technical field [0001] The invention relates to a method for purifying high-purity graphite, in particular to a method for purifying high-purity graphite with a purity greater than 99.99 percent from graphite raw ore. Background technique [0002] High-purity graphite is graphite with a graphite content of more than 99.99%. It is a non-renewable strategic resource and has always been an indispensable resource for military industry, modern technology and high-tech development. [0003] At present, the production methods of high-purity graphite are mainly wet purification methods based on flotation, acid-base method, and hydrofluoric acid method, and fire purification methods based on chlorination roasting method and high-temperature method. These production methods more or less have the disadvantages of poor impurity removal effect, high energy consumption, and serious environmental pollution. Contents of the invention [0004] The invention provides a method for purifying...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 谢刚陈加希于站良俞小花
Owner KUNMING METALLURGY INST
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