Dissociation method of coal-series hard kaolinite rock lamella

A hard, coal-based technology, applied in chemical instruments and methods, inorganic chemistry, inorganic pigment treatment, etc., can solve problems such as complex process, difficult to keep crystal shape intact, and difficult to obtain lamellar products, so as to achieve simple equipment operation, Low production cost and good dissociation effect

Inactive Publication Date: 2014-12-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method comprehensively uses chemical intercalation, mechanical grinding and peeling, calcination and ultrasonic treatment, and the process is extremely complicated.
[0017] The methods used in the above-mentioned related inventions are all grinding or ultrasonic treatment after intercalation, and the process is complicated, the crystal shape is difficult to keep intact, it is difficult to obtain a lamellar product with a large diameter-thickness ratio, and it is not easy to carry out large-scale industrial production
So far, no coal-measure kaolinite dissociation method has been found to maintain a good crystal shape and increase the diameter-thickness ratio of kaolinite

Method used

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  • Dissociation method of coal-series hard kaolinite rock lamella
  • Dissociation method of coal-series hard kaolinite rock lamella
  • Dissociation method of coal-series hard kaolinite rock lamella

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Select coarse-grained kaolinite and crush it, prepare the intercalation composite slurry according to the mass ratio of kaolin: water: potassium acetate = 1:10:0.4. After stirring and standing, the prepared intercalation composite The slurry is centrifuged to obtain the intercalation composite binder and intercalation agent solution, and the intercalation composite binder is put into a calcining furnace at a heating rate of 10°C / min to 350°C, and the temperature is kept constant for 1.5 hours. Wash with water, filter, and finally make 45% mud, and then spray-dry to get finished product. The obtained product D97=2.0μm, the thickness of the wafer ≤150nm, the hexagonal flaky kaolinite crystal in the finished product accounts for 30%, the whiteness is 85%, and the average diameter-thickness ratio is 15:1.

Embodiment 2

[0055] Select fine-grained kaolinite and crush it, prepare the intercalation composite slurry according to the mass ratio of kaolin: water: potassium acetate = 1:1:0.3. After stirring and standing, the prepared intercalation composite The slurry is centrifuged to obtain the intercalation composite binder and intercalant solution, and the intercalation composite binder is put into a calcining furnace at a heating rate of 5° C. / min to 250° C. at a constant temperature for 2.5 hours. It is washed with water, filtered, and finally made into a 40% slurry, and then spray-dried to obtain a finished product. The obtained finished product D97=2.0μm, the wafer thickness ≤150nm, the hexagonal flake kaolinite crystals in the finished product account for 35%, the whiteness is 85%, and the average diameter-thickness ratio is 15:1.

Embodiment 3

[0057] Select coarse crystalline kaolinite and crush it into 325 mesh. The intercalation composite slurry was prepared according to the mass ratio of kaolin: water: potassium acetate = 1:2:0.15, stirred for 30 minutes and then allowed to stand for 12 hours. The prepared intercalation composite slurry is centrifuged to obtain the intercalation composite binder and intercalant solution, and the intercalation composite binder is put into a calciner at a temperature rising rate of 10°C / min to 300°C , Constant temperature for 2.5 hours. And use 3 times the water for washing, and finally make 45% mud, and then spray-dry the product. The obtained product D97=2.0μm, the wafer thickness ≤150nm, the hexagonal flaky kaolinite crystals in the finished product account for 30%, the whiteness is 87%, and the average diameter-to-thickness ratio is 16:1. See attached figure 1 .

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Abstract

The invention belongs to the technical field of preparation of inorganic ultrafine powder materials, and particularly relates to a dissociation method of a coal-series hard kaolinite rock lamella. The dissociation method comprises the following steps of; crushing coal-series hard kaolinite rocks, and mixing with water and an intercalator to obtain intercalated composite slurry; carrying out centrifugal separation on the intercalated composite slurry to obtain an intercalated composite sticky material and an intercalator solution; placing the intercalated composite sticky material into a calcining furnace, increasing temperature to 250-350 DEG C at 5-10 DEG C / minute; and after constant temperature is reached for 1.5-2.5 hours, washing and filtering, and then preparing filtered kaolinite into slurry again for spray drying to obtain a finished product. The method disclosed by the invention achieves the easiness for industrialization; and the dissociated kaolinite rocks can keep more complete kaolinite hexagonal-flaky crystals and have higher radius-thickness ratio and whiteness.

Description

Technical field [0001] The invention belongs to the technical field of preparation of inorganic ultrafine powder materials, and specifically relates to a method for dissociating coal series hard kaolin schist. Background technique [0002] The reserves of coal-measure kaolin in my country are very rich. According to the statistics of some provinces, municipalities and autonomous regions in the country by relevant state departments, the proven reserves of coal-measure kaolin at various levels reach 1.67 billion tons, the prospective reserves are 5.53 billion tons, and the proven plus prospective reserves are about 72. 100 million tons or more, and the predicted reserves can reach 11.09 billion tons. It can be seen that coal gangue resources are extremely rich. Like coal, it is a huge wealth of coal mining enterprises. Such minerals generally occur in coal seam gangue, roof and floor, or exist as independent ore beds. Generally, the coal seam can be mined at the same time. In the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/40C09C3/06C09C3/08C09C3/04C01B33/44
Inventor 程宏飞刘钦甫
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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