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Production method of micro-particle size precipitated barium sulfate

A technology for precipitating barium sulfate and a production method, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve the problems of large particle size, poor dispersibility, wide particle size distribution, etc. , to achieve the effects of improved mechanical properties, increased adhesion, and easy application

Inactive Publication Date: 2016-12-07
SHENZHEN JIAXIN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the precipitated barium sulfate produced by the barium sulfide-glauber's salt method in my country generally has defects such as large primary particle size, wide particle size distribution, and poor dispersion.

Method used

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  • Production method of micro-particle size precipitated barium sulfate

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Embodiment 1

[0011] see figure 1 , the present invention focuses on the control of particle size in the production of precipitated barium sulfate, so that the barium sulfate particle size produced is small and the span is narrow, specifically comprising the following steps:

[0012] S100: Dissolve the crude barium sulfide black ash in water to make a clear barium sulfide solution with a concentration of 190g / L-200g / L and a temperature above 85°C for later use;

[0013] S200: Make sodium sulfate (glauber's salt) into a clear sodium sulfate solution with a concentration of 280-300g / L and a temperature above 85°C for later use.

[0014] In the present invention, the concentration of barium sulfide solution is 190-200g / L, the temperature is 85°C, the concentration of sodium sulfate solution is 280-300g / L, and the temperature is 85°C. In traditional production, the solution concentration is not controlled or the solution concentration is controlled low. The concentration of barium is usually 1...

Embodiment 2

[0023] This embodiment focuses on the application of barium sulfate worthwhile in Example 1. Adopt the barium sulfate prepared in embodiment 1 to prepare modified masterbatch, the high-purity barium sulfate obtained in embodiment 1 is mixed with silane coupling agent, stearic acid, polyethylene wax and resin, in every 100 kilograms of precipitated barium sulfate , add 2 kg of silane coupling agent, 1 kg of stearic acid, 5 kg of polyethylene wax and 15 kg of resin. Then put it into a high-speed mixer for high-speed mixing and heating. The heating temperature is 110°C. After heating for 20 minutes, cool it down. After cooling to 100°C, it is sent into the twin-screw extruder through the feeder. The temperature of the coils is controlled at 190°C, and finally they are extruded by a twin-screw extruder, pelletized and packaged. The prepared modified masterbatch has a particle diameter of 45mm, a relative density of 5 (15°C), a melting point of 1600°C, a Mohs hardness of 3.0, a wh...

Embodiment 3

[0025] This embodiment focuses on the application of barium sulfate worthwhile in Example 1. The method for preparing a composite material by using the barium sulfate prepared in Example 1, comprising: a. adding carbon fibers to 25 parts of 95% ethanol solvent, ultrasonically dispersing, adding acetic acid to adjust the pH to 4-5, adding 10 parts of silane coupling agent KH550, stirred for 8-15h, then washed with deionized water, and dried in vacuum; b. In the remaining 95% ethanol solvent, oxidized graphene oxide into graphene peroxide by glow discharge plasma technology; c. The graphene peroxide obtained by b is added to dimethylformamide (DMF), ultrasonicated for 2 to 3 hours, stirred, followed by adding 4-dimethylaminopyridine (DMAP), dicyclohexylcarbodiimide (DCC) and step a. The resulting carbon fibers were reacted at room temperature for 18-36h, then washed with deionized water, and dried in vacuum to obtain carbon fibers grafted with graphene peroxide; d. Adding fluoro...

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Abstract

The invention discloses a production method of micro-particle size precipitated barium sulfate. The production method comprises the following steps: (S100) dissolving roughed barium sulfide black ash into water, so as to prepare a clear barium sulfide solution with a concentration of 190g / L-200g / L and a temperature higher than or equal to 85 DEG C for later use; (S200) preparing a clear sodium sulfate solution with a concentration of 280g / L-300g / L and a temperature higher than or equal to 85 DEG C from sodium sulfate for later use; (S300) preparing a sodium silicate solution for later use, wherein the addition amount of the sodium silicate solution is 1g / m<3>-10g / m<3>; (S400) mixing the prepared barium sulfide solution with the prepared sodium sulfate solution to react in a reactor, stirring at a speed of 15rov / min-25rov / min to control the uniformity of the reaction, and when the barium content in the solution is slightly large, adding the sodium silicate solution to react for 1h-1.5h so as to reach an equivalent point; (S500) filtering the solution after the reaction, washing until no sulfur ion exists, pulping a barium cake with water, and regulating the pH value to 6.5-7.5 with concentrated sulfuric acid or phosphoric acid; and (S600) filtering barium pulp obtained in the step (500), and carrying out expansion drying at 200-300 DEG C. Barium sulfate prepared by virtue of the production method is high in purity and small in particle size and can be widely applied.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a production method of precipitated barium sulfate. Background technique [0002] At present, the precipitated barium sulfate produced by the barium sulfide-glauber's salt method in my country generally has defects such as large primary particle size, wide particle size distribution, and poor dispersion. These products are acceptable for general paint industry. It is difficult to obtain high gloss and transparency effects when used in powder coatings, plastic industries, and ink industries. There are certain applicable requirements for particle size requirements. The particle size requirements are 0.3-0.5μm, and the distribution collapse is between 1.1-1.2. The current situation is D50 = 0.8-0.9μm, distribution sag between 1.8-2.8. Contents of the invention [0003] Aiming at the defects of the prior art, the invention provides a method for producing precipitated barium sulfa...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/462C01P2004/61C01P2004/62C01P2006/80
Inventor 孙中信杨云海赵慧王同玲
Owner SHENZHEN JIAXIN CHEM CO LTD
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