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Method for increasing specific surface area of calcined coal series kaolinite

A technology of coal series kaolin and specific surface area, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as excessive sieve residue, environmental pollution, and high equipment requirements

Active Publication Date: 2021-05-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the production process of increasing the specific surface area of ​​kaolin existing in the prior art, because the raw materials have certain corrosiveness to the equipment, there is environmental pollution or the sieve residue exceeds the standard and the requirements for the equipment are high, which is not conducive to industrial production, and production After adding ingredients such as organic dispersant and intercalation agent in the process, it also causes technical problems such as low product quality. The purpose of the present invention is to provide a microwave-assisted treatment of coal series kaolin to increase the specific surface area of ​​kaolin, and at the same time It is possible to increase its adsorption capacity, especially the method of oil absorption value

Method used

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  • Method for increasing specific surface area of calcined coal series kaolinite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 3g of coal-based kaolin raw meal and mix it with 1.5g of fiber silk made of silicon carbide into the container;

[0027] (2) Put the container with kaolin raw soil into the microwave oven and process it under 1800W microwave for 7min;

[0028] (3) Put the coal-based kaolin after microwave pretreatment in step (2) into a heating furnace that has been preheated to the same temperature and continue heating to 1000°C at a heating rate of 5°C / min. After holding for 20 minutes, cool to 100°C ;

[0029] (4) Put the calcined kaolin sample cooled to 100° C. into a desiccator and continue cooling to room temperature to obtain a calcined coal-based kaolin product with a high specific surface area.

Embodiment 2

[0031] (1) Take 5g of coal-series kaolin raw meal and mix it with 2.5g of fiber silk made of graphite and put it into the container;

[0032] (2) Put the container of kaolin raw soil into the microwave oven and process it under 2500W microwave for 5min;

[0033] (3) Put the coal series kaolin after the microwave pretreatment in step (2) into the heating furnace that has been preheated to the same temperature at a constant temperature and put it into a heating furnace that has been preheated to the same temperature and continue heating to 1100°C, with a heating rate of 6°C / min, keep warm for 60min and then cool to 100°C;

[0034] (4) Put the calcined kaolin sample cooled to 100° C. into a desiccator and continue cooling to room temperature to obtain a calcined coal-based kaolin product with a high specific surface area.

Embodiment 3

[0036] (1) Take 4g of coal series kaolin raw soil and mix it with 2g of fiber silk made from ferric oxide and put it into the container;

[0037] (2) Put the container with kaolin raw soil into the microwave oven and process it under 2000W microwave for 3min;

[0038] (3) Put the coal-based kaolin after microwave pretreatment in step (2) into a heating furnace that has been preheated to the same temperature and continue heating to 1050°C at a heating rate of 5°C / min. After holding for 30 minutes, cool to 100°C .

[0039] (4) Put the calcined kaolin sample cooled to 100° C. into a desiccator and continue cooling to room temperature to obtain a calcined coal-based kaolin product with a high specific surface area.

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Abstract

The invention relates to a method for increasing the specific surface area of calcined coal-series kaolin. According to the technical scheme, microwaves are introduced for irradiation in the coal-series kaolin dehydroxylation process, and meanwhile, cellosilk with a large dielectric constant is added into original coal-series kaolin in the microwave treatment process to promote the microwave absorption of materials, thus the coal-series kaolin is rapidly heated and dehydroxylated in a dehydroxylation stage, rapid reaction of carbon-containing components is promoted, in-situ pore-increasing expansion of the calcined kaolin is realized, and the specific surface area and pore size of the calcined coal-series kaolin are increased, so that the adsorption capacity, especially the oil absorption performance, of the calcined coal-series kaolin is improved. The specific surface area of the coal series kaolinite obtained by the method is 2-3 times that of the conventional calcined coal series kaolinite, and the oil absorption is improved by 35-45% compared with the common coal series kaolinite clinker.

Description

technical field [0001] The invention belongs to the technical field of non-metallic mineral functional material processing, and in particular relates to a method for increasing the specific surface area of ​​calcined coal series kaolin. Background technique [0002] Coal-series kaolin is an important inorganic non-metallic clay mineral material. It has different uses after being calcined at different temperatures. Among the ten industries, it is mainly used in the paper industry. Due to the stable nature of kaolin, kaolin can be used as filler and coating material in the paper industry. When kaolin is used in the paper industry, it can endow the paper with good covering performance and excellent gloss when coating. In addition, it can also increase the whiteness and smoothness of the paper and greatly improve the quality of the paper. [0003] With the development of my country's paper industry, the expansion of output and the introduction of high-speed knife coaters, the ...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/12C01P2006/14C01P2006/16C01P2006/19Y02P20/10
Inventor 刘一鸣张王刚闫雷高峰苗洋
Owner TAIYUAN UNIV OF TECH