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Method for rapidly non-crystallizing flash hot organic kaolin

An organic kaolin and amorphization technology, applied in chemical instruments and methods, inorganic chemistry, chemical industry, etc., can solve the problems of high energy consumption, many impurities, low efficiency of amorphous kaolin, etc., and achieve convenient operation, simple preparation process, The effect of heating product purity

Active Publication Date: 2019-03-19
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for rapid amorphization of flash organic kaolin to solve the problems of low efficiency, high energy consumption and many impurities in the preparation of amorphous kaolin

Method used

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  • Method for rapidly non-crystallizing flash hot organic kaolin
  • Method for rapidly non-crystallizing flash hot organic kaolin
  • Method for rapidly non-crystallizing flash hot organic kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Crushing and grinding the raw kaolin into powder, passing through a 600-mesh sieve, controlling its average particle size to be less than 25 microns, and placing the sieved kaolin powder in a blast drying oven at 80°C for 24 hours. The organic kaolin was prepared by reacting the dried kaolin and dimethyl sulfoxide at a mass volume ratio of 1:6 g / ml at 50° C. for 72 hours, and the intercalation rate was over 85%. The product organic kaolin was ground in a mortar for 30 min, and then placed in a blast drying oven at 80 °C for 24 h. The treated organic kaolin sample was then placed in a powder spray gun, and the organic kaolin powder was sprayed into a 650°C vertical heating furnace. A feeding tube is placed in the heating furnace, and the length of the feeding tube is adjusted so that the distance from the hot zone is 30cm, and the residence time of the material in the hot zone is 0.1s. The material falls into the collector through the feeding pipe, and is stored in a dr...

Embodiment 2

[0031] Crushing and grinding the raw kaolin into powder, passing through an 800-mesh sieve, controlling its average particle size to be less than 18 microns, and placing the sieved kaolin powder in a blast drying oven at 60°C for 30 hours. The organic kaolin is prepared by reacting the dried kaolin and dimethyl sulfoxide at a mass volume ratio of 1:8 g / ml at 50° C. for 72 hours, and the intercalation rate is over 85%. The product organic kaolin was ground in a mortar for 30 min, and then placed in a blast drying oven at 60 °C for 30 h. The treated organic kaolin sample was then placed in a powder spray gun, and the organic kaolin powder was sprayed into a vertical heating furnace at 750°C. A feeding tube is placed in the heating furnace, and the length of the feeding tube is adjusted so that the distance from the hot zone is 30cm, and the residence time of the material in the hot zone is 0.1s. The material falls into the collector through the feeding pipe, and is stored in a ...

Embodiment 3

[0033] Crushing and grinding the raw kaolin into powder, passing through an 800-mesh sieve, controlling its average particle size to be less than 18 microns, and placing the sieved kaolin powder in a blast drying oven at 60°C for 30 hours. The organic kaolin is prepared by reacting the dried kaolin and dimethyl sulfoxide at a mass volume ratio of 1:10 g / ml at 50° C. for 72 hours, and the intercalation rate is over 85%. The product organic kaolin was ground in a mortar for 30 min, and then placed in a blast drying oven at 60 °C for 30 h. The treated organic kaolin sample was then placed in a powder spray gun, and the organic kaolin powder was sprayed into a vertical heating furnace at 850°C. A feeding tube is placed in the heating furnace, and the length of the feeding tube is adjusted so that the distance from the hot zone is 40cm, and the residence time of the material in the hot zone is 0.2s. The material falls into the collector through the feeding pipe, and is stored in a...

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Abstract

The invention discloses a method for rapidly non-crystallizing flash hot organic kaolin. The method comprises the following steps: grading raw kaolin powder, performing intercalation compounding withdimethyl sulfoxide to prepare organic kaolin, grinding and drying, spraying the organic kaolin into a vertical heating furnace, and performing rapid non-crystallizing by a flash heating method at a flash heating temperature of 650-1050 DEG C. The non-crystallizing transformation rate is controlled by regulating the flash heating temperature and the material retention time. According to the methoddisclosed by the invention, the non-crystallizing transformation temperature of the kaolin is effectively reduced, and the transformation rate of the non-crystallized kaolin is stable and controllable. The method is simple in process, energy-saving, high-efficiency and high in treatment quantity, and the product quality is stable and uniform.

Description

technical field [0001] The invention relates to the technical field of kaolin calcination, in particular to a method for rapid amorphization of flash-hot organic kaolin. Background technique [0002] Amorphous kaolin is a highly active mineral admixture, which is an amorphous aluminum silicate formed by calcining ultrafine kaolin. It has a wide range of applications and can be used as concrete admixtures, cement admixtures or high-performance geopolymers. When amorphous kaolin is used as a cement admixture, participating in the reaction in the cement hydration process can improve the performance of cement, such as enhancing its compressive strength, improving its corrosion resistance and durability. [0003] The methods for preparing amorphous kaolin are mainly traditional calcination and gas suspension furnace calcination. The traditional calcination is to calcine kaolin in air at 700°C for more than 4 hours. At present, the more mature process in China is internal heati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44
CPCC01B33/44Y02P20/10
Inventor 张生辉邱实王力欧雪梅凌意瀚牛继南
Owner CHINA UNIV OF MINING & TECH
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