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Water-saving and energy-saving precipitation production method of silicon dioxide

A technology of silicon dioxide and production methods, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as low efficiency, slow reaction rate between silanol and metal ions, failure to eliminate silanol, etc., to achieve The process is simple, the effect of reducing production water and drying energy consumption, reducing washing water and washing times

Active Publication Date: 2021-02-26
福建中闽大地纳米新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the weak acidity of silanol, the acidity and alkalinity of the solution is close to neutral after the hydrothermal reaction of orthosilicic acid after the action of water glass and sulfuric acid to form silica, and the reaction between silanol and metal ions on the surface of silica Extremely slow and inefficient
Therefore, the silanol on the surface of silica at normal temperature cannot effectively react with the silanol when the solution is nearly neutral in acidity and alkalinity, and the purpose of eliminating the silanol cannot be achieved. When the alkalinity of the solution increases, metal ions are hydrolyzed to form Precipitation of hydroxides of this metal, also unable to react with silanols

Method used

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  • Water-saving and energy-saving precipitation production method of silicon dioxide
  • Water-saving and energy-saving precipitation production method of silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042](1) Take 100 mL of water glass, add water to dilute to 500 mL, and stir well.

[0043] (2) The water glass dilution liquid prepared in step (1) is heated to 80° C., and the pH value is adjusted to 7.0 with 10 wt % sulfuric acid to form a dilute orthosilicate gel.

[0044] (3) The dilute orthosilicate gel was transferred to a 1000mL autoclave with a stirring speed of 200rpm, and heated to 170°C for 5 hours.

[0045] (4) Send 80 mL of a solution containing 2 g of magnesium sulfate from the auxiliary tank to the reaction kettle with high-pressure nitrogen, and continue the reaction at 170° C. for 1 hour.

[0046] (5) After the reaction is completed, the temperature is lowered to below 80° C., filtered with a Buchner funnel, washed until no sulfate is detected by barium chloride, and dried to obtain the product. The water used for beating and washing each filter cake was 800 mL, and the water was washed 3 times in total.

[0047] After testing, the water content of the fil...

Embodiment 2

[0049] (1) Take 100 mL of water glass, add water to dilute to 500 mL, and stir well.

[0050] (2) Heat the water glass dilution prepared in step (1) to 65° C., adjust the pH value to 7.0 with 10 wt % sulfuric acid, and form a dilute orthosilicate gel.

[0051] (3) The dilute orthosilicate gel was transferred to a 1000mL pressure reactor, the stirring speed was 200rpm, and the mixture was heated to 140°C for 10 hours.

[0052] (4) Use high-pressure nitrogen to send 80 mL of a solution in which 2.5 g of calcium nitrate is dissolved from the auxiliary tank to the reaction kettle, and continue the reaction at 140° C. for 1 hour.

[0053] (5) After the reaction is completed, the temperature is lowered to below 80° C., filtered with a Buchner funnel, washed until barium chloride does not contain sulfate radicals, and dried to obtain the product. The water used for beating and washing the filter cake was 800 mL each time, and the water was washed 4 times in total.

[0054] After te...

Embodiment 3

[0056] (1) Take 100 mL of water glass, add water to dilute to 500 mL, and stir well.

[0057] (2) The water glass dilution liquid prepared in step (1) is heated to 85° C., and the pH value is adjusted to 7.0 with 10 wt % sulfuric acid to form a dilute orthosilicate gel.

[0058] (3) The dilute orthosilicate gel was transferred to a 1000 mL pressure reactor with a stirring speed of 200 rpm, and heated to 200° C. for 4 hours.

[0059] (4) Reduce the temperature of the reactor to 160° C., and send 80 mL of a solution in which 3 g of magnesium sulfate is dissolved from the auxiliary tank to the reactor with nitrogen gas, and continue to react for 1 hour.

[0060] (5) After the reaction is completed, the temperature is lowered to below 80° C., filtered with a Buchner funnel, washed until the mother liquor is detected by barium chloride to contain no sulfate groups, and dried to obtain the product. Use 800 mL of water for each wash, and wash 3 times in total.

[0061] After testin...

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Abstract

The invention discloses a water-saving and energy-saving precipitation production method of silicon dioxide. According to the water-saving and energy-saving precipitation production method of the silicon dioxide, sodium silicate is used as a raw material, sulfuric acid is used as a precipitator, silicon dioxide is prepared by a hydrothermal method; metal ion silicate treatment is performed on silicon hydroxyl and the like on the surfaces of the silicon dioxide particles, so that the content of the silicon hydroxyl on the surfaces of the silicon dioxide particles is reduced, and the strong hydrogen bond adsorption effect on water by the silicon dioxide particles is reduced, and therefore, the purposes of reducing production water and drying energy consumption are achieved; the water contentof the washed and filtered filter cake of the silicon dioxide material produced by the technical process is reduced from more than 90% before treatment to less than 75% after alkaline earth metal iontreatment. Compared with a traditional precipitation method for producing the silicon dioxide powder material, the method has the advantages of simple process, low water consumption in the productionprocess, low pollution and low energy consumption. Compared with a gas phase method for producing silicon dioxide, the method has the advantages of simple equipment requirements, low cost, small pollution and low energy consumption.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of inorganic powder materials, and in particular relates to a water-saving and energy-saving precipitation production method of silicon dioxide. Background technique: [0002] Inorganic fillers play an important role in materials with their unique physical and chemical properties. Generally, they can toughen and reinforce a single matrix material, improve the aging resistance and corrosion resistance of products, and most of them can reduce the corrosion resistance of products. cost. Precipitated silica is an important inorganic filler. It has wide sources of raw materials, convenient preparation, and low price, so it has been widely valued. [0003] Silica powder material, commonly known as white carbon black, is an important inorganic filler because of its high purity, low density, high specific surface area, good dispersion, and surface silanol groups (silanol groups) and active silane bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/157C01B33/158C01B33/154
CPCC01B33/158C01B33/157C01B33/154C01P2006/82C01P2002/86C01P2004/01
Inventor 金鑫吕子剑王朝兵
Owner 福建中闽大地纳米新材料有限公司
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