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Dissociation method of coal-series hard kaolinite rock lamella

A kaolinite and dissociation technology, applied in chemical instruments and methods, inorganic chemistry, inorganic pigment treatment, etc., can solve the problems of difficult to keep the crystal form intact, complicated process, difficult to obtain lamellar products, etc., and achieve low production costs. , good dissociation effect, simple equipment operation

Inactive Publication Date: 2013-09-11
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
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  • 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 pulverize it, prepare the intercalation compound slurry according to the ratio of mass ratio kaolin: water: potassium acetate = 1: 10: 0.4, stir and let stand, and prepare the intercalation compound The slurry was centrifuged to obtain the intercalation compound binder and the intercalation agent solution, and the intercalation compound binder was put into a calciner at a heating rate of 10°C / min to 350°C and kept at a constant temperature for 1.5 hours. Wash with water, filter, and finally make 45% mud, and then spray dry to get the finished product. The obtained finished product has D97=2.0 μm, wafer thickness ≤150 nm, hexagonal flaky kaolinite crystals account for 30% of the finished product, whiteness is 85%, and average diameter-thickness ratio is 15:1.

Embodiment 2

[0055] Select fine-grained kaolinite and pulverize it, prepare the intercalation compound slurry according to the ratio of mass ratio kaolin: water: potassium acetate = 1: 1: 0.3, stir and let stand, and prepare the intercalation compound The slurry was centrifuged to obtain the intercalation compound binder and the intercalation agent solution, and the intercalation compound binder was put into a calciner at a heating rate of 5°C / min to 250°C and kept at a constant temperature for 2.5 hours. Wash with water, filter, and finally make 40% mud, and then spray dry to get the finished product. The obtained finished product has D97=2.0 μm, wafer thickness ≤150 nm, hexagonal flaky kaolinite crystals account for 35% of the finished product, whiteness is 85%, and average diameter-thickness ratio is 15:1.

Embodiment 3

[0057] The coarse crystalline kaolinite was selected and crushed into 325 mesh. The intercalation compound 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. Centrifuge the prepared intercalation compound slurry to obtain the intercalation compound binder and intercalation agent solution, put the intercalation compound binder into the calciner and raise the temperature to 300°C at a heating rate of 10°C / min , constant temperature for 2.5 hours. And washed with 3 times of water, finally made into 45% mud, and then spray-dried to obtain the product. The obtained product has D97=2.0 μm, wafer thickness ≤150nm, hexagonal flaky kaolinite crystals account for 30% of the finished product, whiteness is 87%, and average diameter-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 in particular relates to a method for dissociation of coal series hard kaolinite slices. Background technique [0002] my country's coal-measure kaolin reserves are very rich. According to the statistics of some provinces, municipalities and autonomous regions in the country, the proven coal-measure kaolin reserves of all grades are 1.67 billion tons, the prospective reserves are 5.53 billion tons, and the proven and prospective reserves are about 72 More than 100 million tons, the predicted reserves can reach 11.09 billion tons. It can be seen that coal gangue is extremely rich in resources. Like coal, it is a huge wealth of coal mining enterprises. This kind of minerals generally occurs in the gangue of the coal seam, the roof and the floor, or exists as an independent mine. Generally, it can be extracted at the same time as the coal seam is mine...

Claims

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Application Information

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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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