Method for preparing swelled fluorine mica by kaoline

A technology for bentonite fluoromica and kaolin is applied in the field of preparing bentonite fluoromica from natural mineral kaolin, which can solve the problems of uneconomical industrial production and high reaction temperature, and achieve the effects of no environmental pollution, low cost and broad application prospects.

Inactive Publication Date: 2008-11-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the excessively high reaction temperature of the prior art, which is very uneconomical in industrial production, and generally can only obtain the defect of non-swelling fluoromica, thereby providing a kind of low temperature, using cheap kaolin As raw material, method for preparing expanded fluoromica

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Kaolin 55wt% (weight), sodium fluorosilicate Na 2 SiF 6 20wt% (weight) and 25wt% (weight) of magnesium oxide were evenly mixed, put into a platinum crucible, and roasted in an electric furnace at 850° C. for 6 hours to obtain expanded fluoromica. Using X-ray powder diffraction method, the interlayer spacing of the product in the C-axis direction is measured as

Embodiment 2

[0017] Mix kaolin 56wt% (weight), sodium fluoride NaF18wt% (weight), and magnesium oxide 26wt% (weight), put them in a platinum crucible, and bake them in an electric furnace at 850°C for 12 hours to obtain the expanded fluorine Mica. Using X-ray powder diffraction method, the interlayer spacing of the product in the C-axis direction is measured as

Embodiment 3

[0019] Kaolin 36wt% (weight), sodium fluorosilicate Na 2 SiF 6 27wt% (weight) and 37wt% (weight) of basic magnesium carbonate were uniformly mixed, put into a platinum crucible, and roasted in an electric furnace at 900° C. for 4 hours to obtain expanded fluoromica. Using X-ray powder diffraction method, the interlayer spacing of the product in the C-axis direction is measured as

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Abstract

The present invention relates to a method of preparing swelling fluor mica by kaolin pigment, which comprises the steps of evenly mixing kaolin pigment of 25~75 wt % with fluorine compounds of 10~35 wt % and magnesium compounds of 15~40 wt%, calcining for 4~12 hours at 850~900 DEG C; wherein the fluorine compounds are Na2SiF6 or NaF, the magnesium compounds are MgO, Mg(OH)2, brucite, MgCO3(including magnesium carbonate basic)or magnesite. The method of the present invention has the advantages of low cost, low temperature, no environment pollution and wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of fluoromica, in particular to a method for preparing bentonite fluoromica from natural mineral kaolin. Background technique [0002] Fluormica is a general term for a class of layered hydrous aluminosilicates containing potassium, aluminum, magnesium, iron, lithium and other elements. A complex silicon-oxygen layer composed of octahedrons. Its chemical formula is: R + R 3 2+ [AlSi 3 o 10 ]F 2 or R + R 2 3+ [AlSi 3 O10] F 2 where R + for K + 、Na + ; 2+ for Mg 2+ , Fe 2+ , Mn 2+ ; 3+ for Al 3+ , Fe 3+ , Mn 3+ . [0003] Fluormica for industrial use is divided into swelling and non-swelling fluoromica according to the degree of change in interlayer spacing after absorbing water. Among them, the swelling fluoromica refers to the fluoromica that swells due to the increase of the interlayer distance after absorbing water. This fluoromica is mainly used as a Inorganic fillers, lubricants...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/42
Inventor 王丹孟伟青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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