Method for preparing liquid sodium silicate by one-step liquid phase reaction

A liquid-phase reaction, sodium silicate technology, applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of inability to chemically synthesize products, difficult control, and inability to produce finished products, and achieves easy control of investment and production scale, and equipment. Strong applicability and the effect of improving product quality

Inactive Publication Date: 2008-10-08
崔国强
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The content of silicon dioxide in quartz placer is generally 95-97%, containing a large amount of metal ions such as iron, calcium, magnesium, aluminum, etc. After high-temperature roasting, these ions form semi-melting polymer substances with sodium silicate , so that it cannot be effectively separated from the finished product, and the latter product contains a large amount of impurities
The melted sodium silicate can only be used as carton adhesive or ceramic dispersant for industrial use that does not require high impurities, and cannot be used as a further chemical synthesis product
[0004] 2. To make liquid sodium si

Method used

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  • Method for preparing liquid sodium silicate by one-step liquid phase reaction

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Embodiment 1

[0038] Put the SiO in the ingredient pot 2 The No. 7 quartz sand produced in Anhui with a content of more than 99% and 30% liquid caustic soda are mixed at a molar ratio of 2.45:1, and the mixture is pumped into the liquid phase reaction pot that has been stirred under the stirring state, and steam is directly passed into it for heating. When the pressure in the pot reaches 0.65Mpa, stop the steam, automatically increase the pressure to 0.7Mpa, fully react for 4 hours, take samples for analysis, when the modulus reaches 2.4M, discharge the steam in the reaction pot through the vent pipe to reduce the pressure, and the discharged steam is passed to Another reaction pot is used for preheating. After the pressure drops to 0.3Mpa, it is put into a suction filter barrel for vacuum filtration, and the obtained filtrate is 2.4M liquid sodium silicate with a purity of more than 99.0%.

Embodiment 2

[0040] Put the SiO in the ingredient pot 2 The No. 7 quartz sand produced in Anhui with a content of more than 99% and 30% liquid caustic soda are mixed at a molar ratio of 3.25:1, and the mixture is pumped into the liquid phase reaction pot that has been stirred under stirring state, and steam is directly passed into it for heating. When the pressure in the pot reaches 0.65Mpa, stop the steam, automatically increase the pressure to 0.7Mpa, fully react for 5.5 hours, take samples and analyze, the modulus reaches 3.2M, release the steam in the reaction pot through the vent pipe to reduce the pressure, and the released steam is passed into another A reaction pot is used for preheating. After the pressure drops to 0.3Mpa, it is put into a suction filter bucket for vacuum filtration. The suction filtrate material is 3.2M liquid sodium silicate with a purity of more than 99.0%.

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Abstract

The invention discloses a method for preparing liquid sodium silicate by one-step liquid phase reaction. Quartz sand and liquid alkali are mixed with 2.2-3.4:1 of SiO2: NaOH molar ratio and the mixture under stirring status is pumped into a liquid phase reaction pot which is in stirring status; steam is directly fed to heat and when the pressure in the pot reaches to 0.65MPa, steam is stopped feeding; the temperature is automatically raised to 0.65-0.75MPa, and after 4-6 hours of full reaction, decompression and vacuum drawing and filtering are carried out, and the liquid material drawn and filtered is liquid sodium silicate with high purity. The invention also discloses a liquid phase reaction pot which is used specially in the method. The method of the invention has short synthesis line, few control points and simple operation, can obtain liquid sodium silicate products with high quality, generates no three wastes during the whole production course and pertains to green chemical production technique.

Description

technical field [0001] The invention relates to a method for preparing liquid sodium silicate, in particular to a method for preparing liquid sodium silicate by using liquid phase reaction. Background technique [0002] The traditional sodium silicate production process is to put quartz sand and soda ash into a special high-temperature roasting furnace, heat and melt with coal or oil, discharge the material after the reaction is sufficient, and rinse and quench the material directly with cold water to form a glassy sodium silicate solid. blocks. Then use the melting drum to pressurize the block with water and a certain amount of liquid caustic soda to 0.6-0.7Mpa and melt it into a liquid sodium silicate product. There are a number of problems with this approach: [0003] 1. The content of silicon dioxide in quartz placer is generally 95-97%, containing a large amount of metal ions such as iron, calcium, magnesium, aluminum, etc. After high-temperature roasting, these ions ...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 崔国强
Owner 崔国强
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