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Method for preparing sodium silicate by using sodium nitrate

A technology of sodium silicate and sodium nitrate, which is applied to the preparation of alkali metal nitrate, nitric acid, silicate, etc., can solve the problems of underutilization of by-products, waste of resources, etc., achieve good application prospects, save energy and The effect of short cost and process flow

Inactive Publication Date: 2019-12-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The by-products produced by the above technical solutions are not fully utilized, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The present embodiment provides a kind of method for preparing sodium silicate, described method comprises:

[0038] Mix sodium nitrate and quartz sand according to the molar ratio of 2:1, and react in the reaction furnace for 60 minutes in an air atmosphere at 850°C. After the reaction, the solid phase is cooled to obtain sodium silicate product, and the gas generated by the reaction is collected and collected. Dilute nitric acid by-product was obtained using 12 wt% peroxide solution for absorption.

Embodiment 2

[0040] The present embodiment provides a kind of method for preparing sodium silicate, described method comprises:

[0041] Mix sodium nitrate and quartz sand at a molar ratio of 1:1, and react in an oxygen atmosphere at 650°C for 120 minutes in a reaction furnace. After the reaction, the solid phase is water-quenched to obtain sodium silicate product, and the gas generated by the reaction is collected. And water absorption to get dilute nitric acid by-product.

Embodiment 3

[0043] The present embodiment provides a kind of method for preparing sodium silicate, described method comprises:

[0044] Mix sodium nitrate and quartz sand at a molar ratio of 1:2, and react in an air atmosphere at 800°C for 60 minutes in a reaction furnace. After the reaction, cool the solid phase to obtain sodium disilicate product, and collect the gas generated by the reaction. And use sodium hydroxide solution to absorb to obtain sodium nitrate by-product.

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Abstract

The invention provides a method for preparing sodium silicate. The method comprises the following steps: mixing sodium nitrate with a silicon raw material, carrying out a reaction under heating conditions, treating a solid phase after the reaction is completed to obtain a sodium silicate product, and collecting a gas generated by the reaction and performing treating to obtain nitric acid or nitrate by-products. According to the method, the sodium silicate products with different moduli can be selectively prepared by adjusting a ratio of sodium nitrate to quartz sand or other silicon-containingraw materials, and dilute nitric acid or nitrate by-products are produced. The method can also be applied to produce water glass or white carbon black. The method has the characteristics of low reaction temperature, short reaction time, and low energy consumption, the technological process is simple, the purity of the product is high, all the generated gas can be recycled, and thereby the methodhas a relatively good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a method for preparing sodium silicate, in particular to a method for preparing sodium silicate by using sodium nitrate. Background technique [0002] Sodium silicate, commonly known as sodium silicate, is a water-soluble silicate, and its aqueous solution is commonly known as water glass. Sodium silicate is a widely used chemical raw material. It is used to manufacture various silicon compound products such as silica gel, white carbon black, zeolite molecular sieve, and silica sol. It is the basic raw material of silicon compounds. [0003] The production methods of sodium silicate in industry mainly include dry method and wet method. The dry production process is to mix quartz sand and sodium carbonate in a certain proportion and heat them in a reverberatory furnace to about 1300-1400°C to produce molten sodium silicate, which is then water quenched or dry formed to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32C01B21/40
CPCC01B21/40C01B33/32C01D9/06
Inventor 徐红彬唐海燕刘宏辉张红玲裴丽丽张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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