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Method for preparing ammonium illite sheets, alumina silicate sheets, and nano-sized kaolinite

A technology of flaky ammonium and illite, applied in the direction of aluminum silicate, chemical instruments and methods, silicates, etc., can solve the problem of uneven intercalation rate and effect, large changes in particle size and shape of intercalation products, nanometer Problems such as high cost of kaolin, to achieve the effect of easy realization and widening of kaolin deep-processing products

Inactive Publication Date: 2011-10-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0011] ① Selected kaolin powder is directly mechanically peeled or ground, which consumes a lot of energy and cannot reach nano-sized particles;
The intercalation rate and effect of this method are uneven, the particle size and shape of the intercalated products vary greatly, and the recovery of expensive intercalated organic matter is cumbersome and difficult, which makes the cost of nano-kaolin prepared by this method higher.

Method used

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  • Method for preparing ammonium illite sheets, alumina silicate sheets, and nano-sized kaolinite
  • Method for preparing ammonium illite sheets, alumina silicate sheets, and nano-sized kaolinite
  • Method for preparing ammonium illite sheets, alumina silicate sheets, and nano-sized kaolinite

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Embodiment 1

[0045] Coal series kaolin, with kaolinite content of 92.5%, loss on ignition of 17.2%, crushed and ground to an average particle size of less than 2μm. Use a muffle furnace to roast at 800° C. for 2 hours, take 20 g of roasted activated powder, add 150 ml of water, and 50 ml of 25% concentrated ammonia water and mix to obtain a slurry.

[0046] Put the above slurry into a 500ml resin ball mill tank, add 200g of zirconium silicate balls with a diameter of 6mm, and mill for 4 hours at a speed of 400r / min to form a slurry to be hydrothermally reacted.

[0047] Pour the above-mentioned slurry to be hydrothermally reacted into a PTFE-lined 500ml pressure reactor, and conduct a hydrothermal reaction at 200°C for 96 hours; cool the hydrothermally reacted slurry to room temperature and suction filter, and wash the solid with industrial ethanol Twice, dry in an oven at 120°C for 3 hours to obtain flaky ammonium illite. The XRD diffraction pattern of gained ammonium illite is as figu...

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Abstract

The invention relates to a method for preparing a nano-sized kaolinite from kaolin. The method comprises: (1) crushing and baking kaolin to obtain baked kaolin powder; (2) mixing the baked kaolin powder, strong ammonia liquor and water, such that a slurry is obtained; (3) placing the slurry into a pressure reaction vessel for a hydrothermal crystallization reaction; (4) carrying out a solid-liquid separation upon the slurry, washing and drying the slurry, such that ammonium illite sheets are obtained; (5) baking ammonium illite to obtain alumina silicate sheets; (6) mixing alumina silicate and water into a slurry, and placing the slurry into a pressure reaction vessel for a hydrothermal crystallization reaction; (7) carrying out a solid-liquid separation upon the slurry, washing and drying the slurry, such that nano-sized kaolinite is obtained. According to the present invention, cheap kaolin is adopted as a raw material, and ammonium illite sheets are produced through a crushing-baking-hydrothermal treating method. Therefore, difficulties in synthesizing ammonium illite are reduced, preparation technologies are simplified, and alumina silicate and nano-sized kaolinite with specific surface areas exceeding 150m<2> / g are prepared.

Description

field of invention [0001] The invention belongs to the technical field of preparation of fine chemical materials, and in particular relates to a method for preparing flaky ammonium illite, flaky aluminum silicate and nano kaolinite, which are applied in multiple fields such as materials, chemical industry, energy and environment. Background technique [0002] The kaolin subfamily includes several types of minerals such as kaolinite, dikaiite, nacrite, 1.0nm and 0.7nm halloysite, and exists in two forms: hard kaolinite and soft kaolinite. Hard kaolin mines are mainly coal-measure kaolinite. my country's coal-measure kaolinite resources are abundant, reaching 18 billion tons, mainly distributed in Shanxi and Inner Mongolia. Soft kaolin reserves are about 1.46 billion tons, mainly distributed in Guangdong, Guangxi, Fujian and other regions. Kaolin subfamily minerals are widely used in ceramics, refractory materials, papermaking, rubber, plastics, petrochemicals, coatings, pain...

Claims

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Application Information

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IPC IPC(8): C01B33/26C01B33/38B82B3/00
Inventor 卢旭晨王体壮闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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