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Purification method of microcrystal graphite

A purification method and technology of microcrystalline graphite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of high-purity graphite scourge, poisonous gas, and difficult wastewater treatment, so as to reduce the cost of purification and improve environmental protection safe effect

Inactive Publication Date: 2012-07-18
CANADA GLOBAL GRAPHITE
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Problems solved by technology

However, due to the use of highly toxic hydrofluoric acid, the poisonous gas and waste water discharged during the process are difficult to treat, and the toxicity to organisms and environmental pollution are very serious. The production of high-purity graphite using the hydrofluoric acid process is full of disasters. This method effectively disabled

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  • Purification method of microcrystal graphite
  • Purification method of microcrystal graphite

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Embodiment Construction

[0025] refer to figure 1 , describe the flow process of the present invention in detail:

[0026] (1) Desiliconization process: Mix and grind microcrystalline graphite with a fixed carbon content of 80-85%, caustic soda and pull-off powder at a weight ratio of 100:5-8:0.1, then roast at 400-450°C, then pulverize and add The alkali-melted material 2-2.5 weight of water is ground into a fine slurry, and then separated to obtain a high-concentration lye B01 containing silicate impurities. The separated graphite is then washed in countercurrent to obtain alkali-melted graphite. Dilute lye B02 (in the upper layer of the container) and waste lye B03 containing silicate impurities (in the lower layer of the container) are obtained by separation.

[0027] (2) Acidification and impurity removal process: mix alkali-melted graphite (dried) and mixed acid at a weight ratio of 1:0.8-0.9, acidify at 70-80°C for 10 minutes, wherein the mixed acid is composed of hydrochloric acid, phosphoric...

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Abstract

The invention relates to the technical field of graphite purification, in particular to a purification method of microcrystal graphite. The purification method comprises the following steps of: firstly, mixing and grinding graphite with the fixed carbon content being 80%-85%, caustic soda and an assistant, then roasting, then crushing, adding water, grinding the mixture into fine slurry, then obtaining alkali-melting graphite by separation and washing; adding mixed acid (formed by mixing hydrochloric acid, phosphoric acid and ammonium fluoride according to a certain proportion) into the alkali-melting graphite for acidification, carrying out separation and washing after reaction and obtaining a high-purity wet graphite product; and finally drying and packaging the wet graphite product. By adoption of the innovative measures and matching with intermediate control for purifying the graphite materials, the impurities in the graphite can almost be removed, and finally the high-carbon graphite with 99% fixed carbon content can be obtained.

Description

technical field [0001] The invention relates to the technical field of graphite purification, in particular to a method for purifying microcrystalline graphite. Background technique [0002] Microcrystalline graphite is an important raw material and additive in many industrial productions, and is also widely regarded as industrial monosodium glutamate. Microcrystalline graphite is stored in some countries and regions such as Asia, America, and Europe, and China is the largest proven microcrystalline graphite storage place in Asia and even the world, and the reserves after repeated exploration are more than 34 million tons. In recent years, with the rapid development of electronic information industry, nuclear industry, national defense industry and automobile industry, the graphite market has also undergone tremendous changes. First of all, the market demand for "quantity" has increased, and secondly, the demand for "quality" of graphite has increased. Market demand has dri...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/215
Inventor 岳保泰
Owner CANADA GLOBAL GRAPHITE
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