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Prepn of nano barium sulfate

A nano-barium sulfate, nano-scale technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of wide particle size distribution, unstable conditions, large particle size of powder, etc., and achieve good resolubility and dispersibility , the effect of stable operating conditions

Inactive Publication Date: 2003-02-26
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention overcomes the technical problems of large particle size, wide particle size distribution, complex process and unstable conditions in the prior art, and provides a nanometer powder with small particle size, uniform particle size distribution and good monodispersity. Barium sulfate

Method used

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  • Prepn of nano barium sulfate

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Effect test

Embodiment 1

[0028] Adopt technological process of the present invention to attach figure 1 , prepare 0.6mol / L barium chloride solution and 0.6mol / L LEDTA solution and mix them under 400rpm stirring state, use ammonia water to adjust pH to 6~8, complexation time is 20min, add 0.6mol / L sodium sulfate solution, the whole reaction system Gradually from transparent to light blue, and finally bright milky white. The reaction product was separated by sedimentation to obtain a transparent gel, which was dried in an oven at 150° C. to obtain a transparent glassy solid. The average particle size of the barium sulfate particles obtained under this process condition is 25nm, the particle size distribution is 20-40nm, and the hexagonal crystal form is the main form.

Embodiment 2

[0030] Prepare 1.0mol / L barium chloride solution and 1.0mol / L LEDTA solution and mix them under 400rpm stirring state, use ammonia water to adjust pH to 6-8, complexation time is 20min, gradually pour 1.0mol / L sodium sulfate solution, the whole reaction system Gradually from transparent to light blue, and finally bright milky white. The reaction product was separated by sedimentation to obtain a transparent gel, which was dried in an oven at 150° C. to obtain a transparent glassy solid. The average particle size of the barium sulfate particles obtained under this process condition is 25nm, the particle size distribution is 20-40nm, and the hexagonal crystal form is the main form.

Embodiment 3

[0032] Prepare 2.0mol / L barium chloride solution and equimolar EDTA solution and mix them under low-speed stirring, use ammonia water to adjust the pH to 6-8, stir at 400rpm, after complexing for 20min, gradually pour into 2.0mol / L sodium sulfate solution , the whole reaction system gradually changed from transparent to light blue, and finally showed bright milky white. The reaction product was separated by sedimentation in a centrifuge to obtain a transparent gel, which was dried in an oven at 150° C. to obtain a transparent glassy solid. The average particle size of the barium sulfate particles obtained under this process condition is 25nm, the particle size distribution is 20-40nm, and the hexagonal crystal form is the main form.

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Abstract

The present invention belongs to the field of chemical technology and is especially a complexing process of preparing nanometer BaSO4. The process includes two main steps of complexing reaction and deposition reaction. Specifically. Ba2+ ion solution and EDTA complexing agent solution produce complexing reaction in a reactor to produce complex solution with certain stability and ammonia water being used for regulating system pH value. The complex solution is made to react with sulfate radical solution while stirring to prepare nanometer level BaSO4 particles as precipitate. The nanometer level BaSO4 product is hexagonal crystal and blue in color, and has grain size of 20-40 nm and average grain size of 25 nm. The process is stable in operation, and the product has high quality and dispersivity.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing nanometer BaSO4 by a complex method. Background technique [0002] Normal B a SO 4 It is widely used in many industries such as rubber, plastic, ink, paint, paper and so on. nano-B a SO 4 It has important structural properties such as quantum effect, size effect, and surface effect. Its physical properties are different from ordinary materials. It is a new type of high-grade functional filling material. Its application prospect is more broad in medicine, ceramics, composite materials and so on. [0003] In the prior art, the preparation of barium sulfate is mainly liquid-phase direct precipitation method, and most of them are treated with sulfuric acid. Reaction, prepare precipitated barium sulfate with 20% sulfuric acid treatment, alkali metal carbonate plays the role of catalyst in the reaction, its amount is 0.5%~1% of barium ...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01P2004/64B82Y30/00C01F11/462
Inventor 刘有智李裕李同川
Owner ZHONGBEI UNIV
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