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A kind of preparation method of ultrapure anthracite

An anthracite and ultra-pure technology, applied in solid fuel, petroleum industry, fuel, etc., can solve problems such as complex process, high value-added carbon material impurity content requirements, environmental protection pressure, etc., to shorten the process flow and avoid ball milling Process, improve the effect of impurity removal effect

Active Publication Date: 2021-02-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that these processes have at least one drawback, such as complex process, severe equipment corrosion, ineffective recovery of valuable substances, high processing costs, high environmental pressure, high energy consumption, and high impurity content, etc.
For the field of new carbon products with high purity requirements, the current impurity removal process is far from meeting the requirements of high value-added carbon materials for impurity content, resulting in the lack of industrial application of the process, which has great limitations

Method used

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  • A kind of preparation method of ultrapure anthracite

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] Take 10g of anthracite from a certain place in China, crush it to -200 mesh (-74um), then mix the anthracite with 4mol / L hydrofluoric acid at a solid-to-liquid ratio of 10:1ml / g, and then add it to the autoclave (P=0.6MPa ), the setting reaction temperature is 210 DEG C, and the reaction time is 10h, after the reaction is completed, filter, wash, and dry for later use; the coal powder obtained by leaching a section of hydrofluoric acid and the hydrochloric acid of 6mol / L are 15 according to the solid-to-liquid ratio: Mix 1ml / g evenly, set the reaction temperature to 70°C, and the reaction time to 4h. After the reaction is complete, filter, wash with water until neutral, and dry to obtain ultra-pure anthracite, the purity of which is 99.91%.

Embodiment 2

[0035]Take 10g of anthracite from a certain place in China, crush it to -200 mesh (-74um), then mix the anthracite with 4mol / L hydrofluoric acid at a solid-to-liquid ratio of 10:1ml / g, and then add it to the autoclave (P=1.0MPa ), the setting reaction temperature is 210 DEG C, and the reaction time is 8h, after the reaction is completed, filter, wash, and dry for later use; the coal powder obtained by one section of hydrofluoric acid leaching and the hydrochloric acid of 6mol / L are 15 according to the solid-to-liquid ratio: Mix 1ml / g evenly, set the reaction temperature to 70°C, and the reaction time to 4h. After the reaction is complete, filter, wash with water until neutral, and dry to obtain ultra-pure anthracite, the purity of which is 99.92%.

Embodiment 3

[0037] Take 10g of anthracite from a certain place in China, crush it to -200 mesh (-74um), then mix the anthracite with 4mol / L hydrofluoric acid at a solid-to-liquid ratio of 10:1ml / g, and then add it to the autoclave (P=0.6MPa ), the setting reaction temperature is 180 DEG C, and the reaction time is 15h, after the reaction is completed, filter, wash, and dry for later use; the coal powder obtained by leaching a section of hydrofluoric acid and the hydrochloric acid of 6mol / L are 15 according to the solid-to-liquid ratio: Mix 1ml / g evenly, set the reaction temperature to 70°C, and the reaction time to 4h. After the reaction is complete, filter, wash with water until neutral, and dry to obtain ultra-pure anthracite, the purity of which is 99.90%.

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Abstract

The invention discloses a preparation method of ultra-pure anthracite, which comprises the following steps: step 1, crushing the massive anthracite and mixing it with hydrofluoric acid, under the conditions of a pressure of 0.4-1.0 MPa and a temperature of 150°C-250°C Then react, filter, wash, and dry to obtain hydrofluoric acid leached coal; step 2, mix hydrofluoric acid leached coal with acid solution, heat leaching, filter, wash, and dry to obtain ultra-pure anthracite. In the present invention, by simply pre-crushing block anthracite, hydrofluoric acid has strong penetrating ability under high temperature and high pressure conditions, and can react with impurities in larger particle size coal, and at the same time, hydrofluoric acid solution is easier to enter under high pressure conditions. The anthracite coal reacts with impurities in the pores and has strong adaptability to the coal particle size, and the purity of the obtained ultra-pure anthracite coal powder is not less than 99.90%.

Description

technical field [0001] The invention relates to a preparation method of ultra-pure anthracite, and belongs to the technical field of preparation of high value-added functional carbon powder materials. Background technique [0002] Ultra-pure anthracite is a high value-added coal product that can be used as a high calorific value fuel to replace diesel and natural gas for internal combustion engines, gas turbines, aviation turbine engines, etc., and can reduce particulate pollutants, SO 2 , CO 2 , NOx and other coal-burning pollutants to reduce pollution. In order to reduce the wear and slagging effects of pumps, nozzles, pistons and turbine blades, internal combustion engine fuels generally require the ash content of ultra-pure coal to be below 1.0%; ultra-pure anthracite can also be used to prepare high-quality high-performance carbon materials, such as carbon fiber composites , graphite electrodes, new energy materials and other fields, the ultra-low ash content is condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/00
CPCC10L5/00
Inventor 肖劲唐雷仲奇凡王志安
Owner CENT SOUTH UNIV