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Method for preparing high-modulus water glass by using fly ash

A high modulus water glass, fly ash technology, applied in the direction of alkali metal silicate, silicate, etc., to achieve the effect of mild conditions

Inactive Publication Date: 2019-02-15
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the inventors utilized amorphous SiO in fly ash 2 On the basis of calcination and acid leaching, the crystalline phase quartz and mullite were transformed into amorphous SiO 2 , and finally prepared a high-modulus sodium silicate solution by means of normal pressure and low temperature alkali dissolution, which met the composition requirements of commercially available water glass, and there were no relevant reports at home and abroad

Method used

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  • Method for preparing high-modulus water glass by using fly ash
  • Method for preparing high-modulus water glass by using fly ash

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Embodiment 1

[0033] Mix fly ash with 20wt% sodium hydroxide solution, control the solid-to-liquid ratio of fly ash and sodium hydroxide to 1:3, react at 100°C for 2 hours, and filter and separate the obtained desiliconized ash with Fly ash and sodium hydroxide are mixed and ground according to the Na:Al:Si molar ratio of 0.8, and roasted at 850°C for 2h; the roasted product is mixed with 20wt.% hydrochloric acid according to the solid-to-liquid ratio of 1:4, and reacted at 90°C for 2h After the reaction, filter and wash with water to obtain acid leaching residue; mix acid leaching residue and desiliconization solution at a ratio of 1:4, react at 80°C for 2 hours, and filter to obtain high modulus water glass.

Embodiment 2

[0035] Mix fly ash with 20wt% sodium hydroxide solution, control the solid-to-liquid ratio of fly ash and sodium hydroxide to 1:4, react at 95°C for 3 hours, and filter and separate the obtained desiliconized ash with Fly ash and sodium hydroxide are mixed and ground according to the Na:Al:Si molar ratio of 1.0, and roasted at 850°C for 3h; the roasted product is mixed with 20wt% hydrochloric acid according to the solid-to-liquid ratio of 1:5, and reacted at 90°C for 3h, After the reaction, filter and wash with water to obtain acid leaching residue; mix acid leaching residue and desiliconization solution at a ratio of 1:3.5, react at 100°C for 1 hour, and filter to obtain high modulus water glass.

Embodiment 3

[0037] Mix fly ash with 20wt% sodium hydroxide solution, control the solid-to-liquid ratio of fly ash and sodium hydroxide to 1:4, react at 100°C for 2 hours, and filter and separate the obtained desiliconized ash with Fly ash and sodium carbonate were mixed and ground according to the Na:Al:Si molar ratio of 0.8, and roasted at 890°C for 2h; the roasted product was mixed with 20wt.% hydrochloric acid according to the solid-to-liquid ratio of 1:5, and reacted at 90°C for 2h, After the reaction, filter and wash with water to obtain acid leaching residue; mix acid leaching residue and desiliconization solution at a ratio of 1:3.2, react at 90°C for 1 hour, and filter to obtain high modulus water glass.

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Abstract

The invention discloses a method for preparing high-modulus water glass by using fly ash. The method comprises the following steps: 1), mixing the fly ash and a sodium hydroxide solution with the concentration of 20wt.% according to a solid-liquid ratio of 1:2 to 1:4, reacting at 90-100 DEG C for 2-4h, and after completion of a reaction, performing filtering separation to obtain desiliconized ashand a desiliconized solution; 2), performing mixed grinding on the desiliconized ash, the fly ash and sodium salt, and calcinating at 850-900 DEG C for 2-3h; 3), mixing a calcinated product and a hydrochloric acid solution with the concentration of 20wt.%, reacting at 80-90 DEG C for 2-4h, and after completion of a reaction, filtrating and washing by using water to obtain an acid leaching residue,wherein the solid-liquid ratio of the calcinated product to hydrochloric acid is 1:3 to 1:6; 4), mixing the acid leaching residue with the desiliconized solution according to a solid-liquid ratio of1:2 to 1:5, reacting for 0.5-2h while heating at 70-100 DEG C, and then filtering to obtain the high-modulus water glass. The water glass prepared by the method has the modulus of 3.0 or above.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste fly ash, and in particular relates to a method for preparing high-modulus water glass by using fly ash. Background technique [0002] Fly ash is one of the main solid wastes produced by coal-fired power plants, with an output of more than 600 million tons. At present, fly ash is widely used in the fields of building materials and construction engineering, with a utilization rate of 70%. The large amount of unutilized fly ash not only occupies valuable land resources, but also is had a serious impact on the environment. [0003] On the other hand, fly ash contains various oxides, such as Al 2 o 3 , SiO 2 , CaO, Fe 2 o 3 etc., where Al 2 o 3 and SiO 2 content of more than 80%. Therefore, extracting these oxides from fly ash to prepare high value-added chemical products can not only alleviate the environmental problems caused by fly ash, but also gener...

Claims

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Application Information

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IPC IPC(8): C01B33/32
CPCC01B33/32C01P2006/80
Inventor 程芳琴柳丹丹崔静磊郭彦霞吴海滨
Owner SHANXI UNIV
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