Submicron flake-shaped barium sulfate and preparation method thereof

A barium sulfate, sub-micron technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of low cost and no additives, and achieve the effect of mild process conditions, high purity, low cost and no additives

Active Publication Date: 2014-04-02
HONGXING XINHUANG EXACT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention adopts the method of continuous reaction of industrial barium sulfide solution and sulfuric acid microcavity to

Method used

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  • Submicron flake-shaped barium sulfate and preparation method thereof
  • Submicron flake-shaped barium sulfate and preparation method thereof
  • Submicron flake-shaped barium sulfate and preparation method thereof

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preparation example Construction

[0041] The invention provides a kind of preparation method of submicron flaky barium sulfate, comprising the steps of:

[0042] (1) Sulfuric acid pretreatment

[0043] Sulfuric acid is made into a sulfuric acid aqueous solution with a concentration of 4.0±0.5mol / L, degassed under stirring, and then cooled and filtered to obtain pretreated sulfuric acid; preferably, the degassing time is 2.5-4 hours, preferably 3 hours; preferably, after cooling to 35°C-40°C, filter; preferably after cooling to 35-40°C, filter with a 1 μm precision filter.

[0044] This step is to carry out the step of pretreatment to the raw material sulfuric acid of producing barium sulfate, and this is the need of obtaining barium sulfate with better whiteness. When blowing, generally clean air is blown in to prevent the nitrogen in it from affecting the quality of sulfuric acid.

[0045] During the sulfuric acid production process, a small amount of nitrogen oxides will be produced and remain in the sulfu...

Embodiment 1

[0083] Lower binding figure 1 The process flow diagram of the present invention illustrates the process of preparing submicron plate-shaped barium sulfate.

[0084] (1) Sulfuric acid pretreatment

[0085] Pour the concentrated sulfuric acid into the 10M 3 In the reaction pot of deionized water, prepare a solution with a sulfuric acid concentration of 4.0mol / L, then blow in purified air, degas for 3 hours under stirring, cool the jacket to 38°C, and filter it with a 1μm precision filter before use .

[0086] (2) Barium sulfide pretreatment

[0087] Add 100L of industrial barium sulfide solution into deionized water to make a barium sulfide solution with a concentration of 71.0g / L, keep the solution temperature at 53°C, and filter it with a 1μm precision filter before use.

[0088] (3) Continuous synthesis

[0089] The BaS solution obtained in step (2) reacts with the sulfuric acid solution obtained in step (1) at a flow rate of 600L / h, while adjusting the H 2 SO 4 The fl...

Embodiment 2

[0094] Lower binding figure 1 The process flow diagram of the present invention illustrates the process of preparing submicron plate-shaped barium sulfate.

[0095] (1) Sulfuric acid pretreatment

[0096] Pour the concentrated sulfuric acid into the 10M 3 Prepare a solution with a sulfuric acid concentration of 4.0mol / L in a reaction pot of deionized water, blow in purified air, degas for 3 hours under stirring, cool the jacket to 39°C, and filter it with a 1μm precision filter before use .

[0097] (2) Barium sulfide pretreatment

[0098] Add 100L of industrial barium sulfide solution into deionized water to make a barium sulfide solution with a concentration of 60.2g / L, keep the solution temperature at 54°C, and filter it with a 1μm precision filter before use.

[0099] (3) Continuous synthesis

[0100] The BaS solution obtained in step (2) reacts with the sulfuric acid solution obtained in step (1) at a flow rate of 580L / h, while adjusting the H 2 SO 4 The flow rate ...

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Abstract

The invention discloses a submicron flake-shaped barium sulfate and a preparation method thereof. The preparation method comprises the following steps: (1) pretreating barium sulfate, namely, preparing sulfur into a sulfur aqueous solution with the concentration of 4.0+/-0.5mol/L, degassing under stirring, and subsequently cooling and filtering so as to obtain pretreated sulfuric acid; (2) pretreating barium sulfide, namely, performing hot filtration on the barium sulfide solution with the concentration of 60-90g/L so as to obtain pretreated barium sulfide; (3) continuously synthesizing, namely, stirring to react the obtained BaS solution with the sulfuric acid obtained in the step (1) in the flow of 600+/-50L/h, and keeping the concentration of the sulfuric acid in the reaction solution be greater than 3.0g/L in the reaction process so as to obtain reaction slurry; (4) performing an aftertreatment procedure; and (5) performing a finished product procedure so as to obtain the barium sulfate product. The barium sulfate is flake-shaped, the barium sulfate content is within 99.4-99.5%, the whiteness is greater than 99.5%, and D50 is within the range of 0.70-0.80 micron.

Description

technical field [0001] The invention relates to the technical field of preparation of fine inorganic chemical fillers, in particular to a flaky barium sulfate and a manufacturing method thereof. Background technique [0002] Barium sulfate is widely used in far-infrared reflective films, soft light lamps and backlight film materials. Submicron flake barium sulfate has attracted people's attention because of its excellent optical properties. [0003] There are many production processes for flaky barium sulfate, and generally need to add additives for preparation, and it is easy to introduce impurities, which will affect its application in electro-optical materials. [0004] Therefore, the low development cost and the preparation of submicron plate-shaped barium sulfate without additives have become a technical problem in this area that needs to be solved urgently. Contents of the invention [0005] The technical problem to be solved by the present invention is to provide a...

Claims

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Application Information

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IPC IPC(8): C01F11/46
Inventor 姜志光华东高月飞吴飞
Owner HONGXING XINHUANG EXACT CHEM
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