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Method for preparing silica modified barium sulfate powder

A technology of silicon dioxide, barium sulfate powder, applied in chemical instruments and methods, calcium/strontium/barium sulfate, inorganic chemistry, etc., can solve the problems of complex process, uneven dispersion, organic matter modification, etc. Simple, simple process, reducing the effect of agglomeration

Active Publication Date: 2018-03-02
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The content of the present invention aims at the problems of uneven dispersion, complicated process and modification of organic matter in the current preparation process of ultrafine barium sulfate

Method used

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  • Method for preparing silica modified barium sulfate powder

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Embodiment 1

[0023] (1) Prepare a barium sulfide solution with a concentration of 15wt%, add it to a sodium carbonate solution with a concentration of 25wt% according to a molar ratio of 1:1.5, and react with high-shear stirring at a speed of 8000r / min at 30°C for 4 hours;

[0024] (2) After step (1) is filtered and washed, according to the molar ratio of sodium sulfate and barium sulfide is 1:1.5, the filter cake is added to a concentration of 25wt% sodium sulfate solution to carry out a high-shear stirring reaction at a speed of 8000r / min. , the reaction temperature is 30°C, and the reaction time is 8 hours;

[0025] (3) After completing step (2), add sodium silicate with a concentration of 15wt% in step (2), the addition amount is 10% of the molar weight of barium sulfide, and at the same time add 0.8 moL -1 The sulfuric acid solution was stirred and reacted at a speed of 8000r / min for 2 hours, filtered, washed with water, and dried at 200°C to obtain ultrafine silica-modified barium s...

Embodiment 2

[0027] (1) Prepare a barium sulfide solution with a concentration of 0.1wt%, add it to a sodium carbonate solution with a concentration of 1wt% according to a molar ratio of 1:1.2, and react with high-shear stirring at a speed of 500r / min at 20°C for 0.5 hours;

[0028] (2) After step (1) is filtered and washed, according to the molar ratio of sodium sulfate and barium sulfide is 1:1.2, the filter cake is added to a concentration of 1wt% sodium sulfate solution to carry out a high-shear stirring reaction at a speed of 500r / min. , the reaction temperature is 20°C, and the reaction time is 0.5 hours;

[0029] (3) After completing step (2), add sodium silicate with a concentration of 10wt% in step (2), the addition amount is 0.1% of the molar weight of barium sulfide, and at the same time add 0.2% sodium silicate with a molar ratio of 1.1:1 moL -1 Sulfuric acid solution, continue to react with high-shear stirring at a speed of 500r / min for 1 hour, filter, wash with water, and dr...

Embodiment 3

[0031] (1) Prepare a barium sulfide solution with a concentration of 10wt%, add it to a sodium carbonate solution with a concentration of 15wt% according to a molar ratio of 1:1.3, and react with high-shear stirring at a speed of 3000r / min at 65°C for 2 hours;

[0032] (2) After step (1) is filtered and washed, according to the molar ratio of sodium sulfate and barium sulfide is 1:1.3, the filter cake is added to a concentration of 15wt% sodium sulfate solution to carry out a high-shear stirring reaction at a speed of 3000r / min. , the reaction temperature is 65°C, and the reaction time is 2 hours;

[0033] (3) After completing step (2), add sodium silicate with a concentration of 12wt% in step (2), and the addition amount is 5% of the molar weight of barium sulfide, and at the same time add sodium silicate with a molar ratio of 1.1:1 0.4molL -1 Sulfuric acid solution, continue to react at a speed of 3000r / min under high shear for 1.5 hours, filter, wash with water, and dry at...

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Abstract

A method for preparing silica modified barium sulfate powder comprises the following steps: adding a barium sulfide solution into a sodium carbonate solution, performing stirring reacting at 20-95 DEGC for 0.5-4 h, filtering the obtained solution, adding the obtained filter cake into a sodium sulfate solution, performing high-shearing stirring reacting at 20-95 DEG C for 0.5-8 h, adding sodium silicate accounting for 0.1-10% of the mole of the barium sulfide, adding a sulfuric acid solution according to a molar ratio of sulfuric acid to the sodium silicate being (1.1-1.2):1, continuously performing stirring reacting for 1-2 h, and sequentially carrying out filtration, water washing and 100-200 DEG C drying to obtain the silica modified barium sulfate. The method has the advantages of simple process, less device investment, and realization of large-scale industrialization.

Description

technical field [0001] The invention belongs to a preparation method of silicon dioxide modified barium sulfate powder. Background technique [0002] Barium sulfate is an important chemical raw material, widely used in coatings, inks, rubber, medicine, plastics, textiles, drilling and other fields. With the continuous upgrading of products in the application field, ordinary barium sulfate can no longer meet the needs of products due to its large particle size, uneven distribution, single surface properties, high impurity content, and large differences between batches. People try to develop some superfine functional barium sulfate preparation technologies that meet the market requirements, establish high value-added barium sulfate micropowder production lines, and launch a series of submicron barium sulfate products with uniform particle size distribution and multifunctionality to increase the market for barium sulfate in my country Competitiveness. [0003] Bai Xinfang of H...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01F11/462C01P2004/62C01P2004/64C01P2004/80C01P2006/12
Inventor 李玉霞任真郭建平冯瑜
Owner CHINA RES INST OF DAILY CHEM IND
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