Method for preparing calcium silicate heat insulation material by using fly ash desiliconized solution

A thermal insulation material, fly ash technology, applied in the field of preparation of calcium silicate thermal insulation materials, can solve the problems of incomplete reaction of raw materials, high material consumption and energy consumption, long reaction time, etc., and achieve good fireproof performance, light weight and thermal insulation performance Good results

Inactive Publication Date: 2018-09-07
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using the above-mentioned traditional process, the liquid-solid ratio of raw materials required in the process of synthesizing xonotlite is high, and the reac...

Method used

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  • Method for preparing calcium silicate heat insulation material by using fly ash desiliconized solution
  • Method for preparing calcium silicate heat insulation material by using fly ash desiliconized solution

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Embodiment 1

[0045] This embodiment provides a method for preparing a calcium silicate thermal insulation material using fly ash desiliconization liquid, comprising the following steps:

[0046] 1) Add fly ash to a sodium hydroxide solution with a concentration of 14wt% to form a slurry, and control the mass ratio of sodium hydroxide to fly ash dry basis to 0.40:1, and then perform pre-removal at a temperature of 95°C Silicon reaction. After reacting for about 1 hour, the reaction product was subjected to solid-liquid separation, and the liquid was taken as the fly ash desiliconization liquid.

[0047] Adjust the concentration of fly ash desiliconization solution so that Na 2 O concentration reaches 62g / L, SiO 2 The concentration reaches 60g / L.

[0048] 2) Add milk of lime to the fly ash desiliconization solution so that the Ca / Si (molar ratio) of the resulting slurry is 1.0, and adjust the liquid-solid mass ratio of the slurry to 30:1 by adding water.

[0049] Put the slurry into the ...

Embodiment 2

[0056] This embodiment provides a method for preparing a calcium silicate thermal insulation material using fly ash desiliconization liquid, comprising the following steps:

[0057] 1) Add fly ash to a sodium hydroxide solution with a concentration of 15wt% to form a slurry, and control the mass ratio of sodium hydroxide to fly ash dry basis to 0.45:1, and then carry out pre-removal at a temperature of 80°C Silicon reaction. After reacting for about 1.5 hours, the solid-liquid separation of the reaction product was carried out, and the liquid was taken as the fly ash desiliconization liquid.

[0058] Adjust the concentration of fly ash desiliconization solution so that Na 2 O concentration reaches 70g / L, SiO 2 The concentration reaches 56g / L.

[0059] 2) Add milk of lime to the fly ash desiliconization solution, so that the Ca / Si (molar ratio) of the obtained slurry is 0.98, and adjust the slurry with a liquid-solid mass ratio of 25:1 by adding water.

[0060] Put the slur...

Embodiment 3

[0067] This embodiment provides a method for preparing a calcium silicate thermal insulation material using fly ash desiliconization liquid, comprising the following steps:

[0068] 1) Add fly ash to a sodium hydroxide solution with a concentration of 18wt% to form a slurry, and control the mass ratio of sodium hydroxide to fly ash dry basis to 0.39:1, and then perform pre-removal at a temperature of 60°C Silicon reaction. React for about 2.0 hours, conduct solid-liquid separation on the reaction product, and take the liquid, which is the fly ash desiliconization liquid.

[0069] Adjust the concentration of fly ash desiliconization solution so that Na 2 O concentration reaches 75g / L, SiO 2 The concentration reaches 62g / L.

[0070]2) Add milk of lime to the fly ash desiliconization solution so that the Ca / Si (molar ratio) of the resulting slurry is 1.1, and adjust the liquid-solid mass ratio of the slurry to 35:1 by adding water.

[0071] Put the slurry into a high-temperat...

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Abstract

The invention provides a method for preparing a calcium silicate heat insulation material by using a fly ash desiliconized solution. The method comprises the following steps of (1) performing pre-desiliconizing reaction on fly ash and a sodium hydroxide solution, so as to obtain the desiliconized fly ash and a fly ash desiliconized solution; (2) mixing the fly ash desiliconized solution and lime emulsion, and performing hydrothermal synthesizing reaction on the obtained slurry, so as to obtain the xonotlite slurry; (3) washing the xonotlite slurry, mixing with enhanced fibers, pressing, forming and drying, so as to obtain the calcium silicate heat insulation material. The method provided by the invention has the advantages that by using the fly ash desiliconized solution as the silicon rawmaterial to prepare the xonotlite type calcium silicate heat insulation material, the reaction time is short, the energy consumption is low, and the product property is good; a new high-quality utilization path is provided for the fly ash.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a method for preparing calcium silicate thermal insulation materials by utilizing fly ash desiliconization liquid. Background technique [0002] Calcium silicate thermal insulation material is a kind of xonotlite as the main crystal phase (6CaO 6SiO 2 ·H 2 O) thermal insulation material, its structure belongs to the monoclinic crystal system, and its microstructure is prism-like crystals or fibrous aggregates. It has the advantages of light weight, fire prevention, high temperature resistance, good sound and heat insulation performance, high strength, stable size, good decoration, simple processing equipment, low energy consumption, etc., so it can be widely used in petroleum, chemical industry, electric power, metallurgy, building materials, etc. field. [0003] The traditional calcium silicate thermal insulation material is mainly made of siliceous raw m...

Claims

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Application Information

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IPC IPC(8): C04B28/18C04B18/08C04B111/28
CPCC04B18/08C04B28/186C04B2111/28C04B2201/20C04B2201/32C04B2201/50C04B22/062C04B22/064C04B12/04C04B14/42C04B18/241C04B16/0625Y02W30/91
Inventor 杨志杰孙俊民魏晓芬闫禄军张西民陈杨
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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