A method for exfoliating coal-measure hard kaolinite that keeps kaolinite crystal form

A kind of kaolinite and hard technology, which is applied in the field of ultrafine kaolin preparation, can solve the problems of complex process, difficulty in large-scale industrial production, difficulty in keeping the crystal shape intact, etc., and achieve the effect of light damage

Inactive Publication Date: 2011-12-07
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] 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, and it is not easy to carry out large-scale industrial production
No flaking method for coal-measure kaolinite with good crystal shape has been found so far

Method used

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  • A method for exfoliating coal-measure hard kaolinite that keeps kaolinite crystal form
  • A method for exfoliating coal-measure hard kaolinite that keeps kaolinite crystal form
  • A method for exfoliating coal-measure hard kaolinite that keeps kaolinite crystal form

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Experimental program
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Effect test

Embodiment 1

[0044] The coarse crystalline kaolinite was selected and crushed into 325 mesh. The intercalation composite system slurry was prepared at a mass ratio of kaolin: water: hydrazine hydrate = 1:2:0.15, and stirred slowly for 12 hours. Pour the prepared kaolin slurry into the grinding and peeling bucket filled with medium balls. The mass ratio of medium balls with different particle sizes (0.8-1.2mm, 1.5-2.0mm, 2.0-2.5mm) is 3:2:1. The mass ratio to the medium ball is 1:1. Adjust the rotating speed of the grinding and peeling machine to 1200 rpm, and grind and peel for 1.5 hours. Filter, wash with 3 times of water, finally make 45% mud, and then spray dry to get the product. The obtained product D97=1.9 μm, the thickness of the wafer is ≤200nm, about 30% has hexagonal crystal shape, and the ratio of diameter to thickness is 10:1. See attached figure 1 .

Embodiment 2

[0046] Mesocrystalline kaolinite was selected and crushed to 325 mesh. The intercalation composite system slurry was prepared according to the mass ratio of kaolin: water: formamide = 1: 1.5: 0.2, and stirred slowly for 15 hours. Mix medium balls with diameters of 0.8-1.2mm, 1.5-2.0mm, and 2.0-2.5mm in a mass ratio of 3:2:1, pour them into the grinding and peeling bucket, and then pour kaolin mud into it to make the mud and The mass ratio of the medium balls is 1:1.2. Adjust the rotating speed of the grinding and peeling machine to 1300 rpm, and grind and peel for 1.0 hour. Filter, wash with 5 times of water, finally make 45% mud, and then spray dry to get the product. The obtained product D97=1.5 μm, the thickness of the wafer is ≤100 nm, about 60% has a hexagonal crystal shape, and the aspect ratio is 20:1. See attached figure 2 .

Embodiment 3

[0048] Fine-grained kaolinite was selected and crushed into 250 mesh. The intercalation composite system slurry was prepared at a mass ratio of kaolin: water: dimethyl sulfoxide = 1:3:0.3, heated at 70°C and stirred slowly for 30 hours. Mix medium balls with diameters of 0.8-1.2mm, 1.5-2.0mm, and 2.0-2.5mm according to the mass ratio of 3:2:1, pour them into the grinding and peeling bucket, and then pour kaolin mud to make the mud and the medium The mass ratio of the balls is 1:1.5. Adjust the rotating speed of the grinding and peeling machine to 1500 rpm, and grind and peel for 1.5 hours. Filter and wash with 5 times of water, finally make 40% mud, and then spray dry to get the product. The obtained product D97=1.0 μm, the thickness of the wafer is ≤50 nm, about 60% has a hexagonal crystal shape, and the diameter-thickness ratio is 10:1. See attached image 3 .

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Abstract

The invention discloses a method for peeling coal-measure hard kaolinite, comprising the following steps: pulverizing the coal-measure hard kaolinite, mixing the pulverized kaolin, water and an intercalating agent to obtain intercalation composite slurry , the intercalation composite slurry is ground and stripped with three particle size media balls, and then filtered, washed and spray-dried to obtain the finished product. The method can maintain relatively complete hexagonal flaky kaolinite crystal form, with hexagonal flaky kaolinite crystals accounting for 30-60%.

Description

technical field [0001] The invention relates to a preparation method of ultrafine kaolin, which belongs to the technical field of preparation of inorganic ultrafine powder materials. Background technique [0002] There are abundant kaolinite resources in my country's coal-bearing strata, and its resources are predicted to reach more than 18 billion tons. This kind of minerals generally occurs in the gangue or roof and floor of coal seams, and was previously discarded as ore. In order to make full use of coal resources and develop circular economy, there has been an upsurge in the development of coal-measure kaolinites in my country's coal mining areas in the past ten years. At present, more than 50 coal-measure kaolinite processing enterprises have been established in the coal mining areas of Shanxi, Inner Mongolia, Henan, Shandong, Hebei and other provinces in my country, and the cumulative annual output of the country has reached 600,000-800,000 tons. Coal-measure kaolin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/42C01B33/40C01B33/44
Inventor 刘钦甫程宏飞
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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