Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue

A technology of sodium silicate and coal gangue, applied in the direction of silicate, alkali metal silicate, solid waste removal, etc., can solve the problems of high equipment requirements and increased energy consumption, so as to reduce energy consumption and avoid strong The effect of corrosion

Active Publication Date: 2013-02-20
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Excessive calcination temperature not only requires

Method used

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  • Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue
  • Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue
  • Method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 100g of silicon slag and 110g of sodium carbonate, mix and grind them into particles of about 5 μm in a ball mill, and place them in a muffle furnace to program the temperature. The heating rate is 10°C / min between 0-500°C; °C / min; stop at 850 °C for 3 hours, then quickly place in boiling water for water quenching to obtain crude sodium silicate solid. Put the above crude sodium silicate solid in a 1-liter high-pressure reactor, add 500 ml of distilled water, raise the temperature to 150°C, stir and dissolve for 5 hours, then lower the temperature to room temperature, filter and separate to obtain colorless and transparent sodium silicate Solution and filter residue, the sodium silicate solution is evaporated and crystallized to obtain the sodium silicate product. ICP was used to determine the silicon content and impurity content of sodium silicate solution, filter residue and sodium silicate product (Table 2). The results of thermogravimetric differential therma...

Embodiment 2

[0029] Weigh 100g of silicon slag and 70g of sodium carbonate and mix and grind. The rest of the conditions are the same as in Example 1. ICP is used to measure the silicon content and impurity content of the sodium silicate solution and filter residue (alkali dissolution method) respectively (Table 3). The results of thermogravimetric differential thermal analysis compared under the same process conditions are as follows: figure 2 , The dissolution rate of sodium silicate is 90.0%.

[0030] Table 3 Product composition analysis table

[0031]

[0032] It can be seen from differential thermal analysis (see figure 2 ), the thermogravimetric analysis results are the same as in Example 1, and the melting temperature can be obtained from the DSC curve at 805°C.

Embodiment 3

[0034] Take by weighing 100g of silicon slag and 164g of sodium carbonate and mix and grind, all the other conditions are the same as in Example 1. The silicon content and impurity content of sodium silicate solution and filter residue (alkali dissolution method) were determined by ICP (Table 3). The results of thermogravimetric differential thermal analysis compared under the same process conditions are as follows: image 3 , The dissolution rate of sodium silicate is 90.2%.

[0035] It can be seen from differential thermal analysis (see image 3 ), the thermogravimetric analysis results are the same as in Example 1, and the melting temperature can be obtained from the DSC curve at 829°C.

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Abstract

The invention relates to a method for preparing soluble glass by using waste residues with aluminum extracted by coal gangue. The method comprises firstly mixing and grinding the waste residue with aluminum extracted by coal gangue and sodium carbonate to be 1-50mu m particles, then conducting temperature programming in a muffle furnace, conducting low temperature congruent melting reaction for 1-5 hours at the temperature of 500-850 DEG C, and conducting water quenching to obtain coarse sodium silicate solid; and placing the coarse sodium silicate solid in a high pressure reactor, adding distilled water, heating to be 150 DEG C, stirring and dissolving for 5 hours, cooling to be room temperature, filtering and separating to obtain a colorless and transparent sodium silicate solution, and crystallizing to be the soluble glass. The method lowers the temperature for preparing sodium silicate by using a traditional soda ash method by about 600 DEG C, greatly reduces energy consumption, and simultaneously avoids highly corrosive of a traditional caustic soda alkali-dissolution method on production facilities and alkali pollution on the environment.

Description

technical field [0001] The invention relates to the preparation of sodium silicate, in particular to a method for preparing soluble sodium silicate by using coal gangue to extract aluminum waste residue. Background technique [0002] When coal gangue, kaolin or fly ash are used as raw materials to prepare polyaluminium chloride or aluminum sulfate, a large amount of waste residue will be produced, and the waste residue contains a large amount of silicon dioxide. If it cannot be effectively comprehensively utilized, it will inevitably lead to increased production costs and Secondary environmental pollution. [0003] Soluble sodium silicate has a wide range of uses, which can be summarized as follows: (1) Industrial raw materials: it can be used to prepare silica sol, silica gel, precipitated silica, zeolite, aluminosilicate, magnesium silicate, synthetic clay, cement or catalyst, etc.; (2) Detergent: used as fabric washing powder, dish detergent and industrial cleaning agent...

Claims

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Application Information

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IPC IPC(8): C01B33/32B09B3/00
Inventor 程芳琴方莉杨凤玲段晓芳
Owner SHANXI UNIV
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