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Preparation method of calcium silicate insulation material

A thermal insulation material, calcium silicate technology, which is applied in the field of thermal insulation materials, can solve the problems of difficult and effective utilization of calcium silicate, and achieve the effects of difficult and effective utilization, good product performance and short reaction time

Active Publication Date: 2014-02-05
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a preparation method of calcium silicate insulation material, which solves the problem that calcium silicate is difficult to be effectively utilized in the by-product of the current high-alumina fly ash aluminum extraction process

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0018] The preparation method of the calcium silicate insulation material provided by the invention comprises the following steps:

[0019] S1: Crush the calcium silicate raw material, and perform stirring and pulping according to the ratio of liquid to solid mass ratio of 10-20 to obtain calcium silicate slurry. Among them, calcium silicate is formed by reacting the obtained sodium silicate solution with lime after extracting the alumina in the fly ash by alkali method;

[0020] S2: Inject the prepared calcium silicate slurry into a dynamic reaction kettle, and synthesize it for 2-6 hours at a temperature of 190-250°C and a pressure of 1.3Mpa-4.0MPa to obtain a xonotlite slurry;

[0021] S3: Add 1-3% fiber reinforced raw materials to the xonotlite slurry, such as glass fibers, wood fibers or asbestos fibers;

[0022] S4: add 0.5-3% water glass again in the xonotlite slurry that S3 obtains;

[0023] S5: After stirring the slurry prepared in S4, inject it into the mold of the...

Embodiment 1

[0033] Firstly, the by-product calcium silicate raw material obtained by extracting alumina from fly ash is crushed, and a certain amount of water is added according to its water content to make the liquid-solid ratio reach 20. Then, stir the prepared calcium silicate slurry evenly, inject it into the reaction kettle, react at 2.0Mpa and 215°C for 1.5h, and react at 1.8Mpa and 210°C for 1h to obtain xonotlite slurry. Then pump the xonotlite slurry from the reactor to the middle tank, and then add 3% glass fiber and 2% water glass to the middle tank. After stirring evenly, pump the xonotlite slurry to the filter press forming machine, and keep it under the pressure of 5000t for 1.5min to form. Finally, the formed calcium silicate thermal insulation material is dried in a tunnel kiln at 105°C for 18 hours to obtain a finished product. The tested density is 256kg / m 3 , thermal conductivity 0.069W / (m·k), compressive strength 0.85MPa, flexural strength 0.60Mpa, maximum service te...

Embodiment 2

[0035] Firstly, the by-product calcium silicate raw material obtained by extracting alumina from fly ash is crushed, and a certain amount of water is added according to its water content to make the liquid-solid ratio reach 15. Then, stir the prepared calcium silicate slurry evenly, inject it into the reactor, react at 1.9Mpa and 212°C for 2h, and react at 1.7Mpa and 205°C for 1h to obtain xonotlite slurry. Then pump the xonotlite slurry from the reactor to the middle tank, and then add 2% glass fiber and 2% water glass to the middle tank. After stirring evenly, pump the xonotlite slurry to the filter press forming machine, and keep it under the pressure of 5000t for 1.5min to form. Finally, the formed calcium silicate thermal insulation material is dried in a tunnel kiln at 105°C for 18 hours to obtain a finished product. The tested density is 251kg / m 3 , thermal conductivity 0.063W / (m·k), compressive strength 0.81MPa, flexural strength 0.58Mpa, maximum service temperature ...

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Abstract

The invention discloses a preparation method of a calcium silicate insulation material. The method comprises the following steps of smashing calcium silicate which is used as a raw material, mixing the smashed calcium silicate with water, and stirring the calcium silicate with the water according to a liquid-solid mass ratio of 10 to 20 to prepare calcium silicate slurry, wherein the calcium silicate is one of byproducts produced by extracting aluminum oxide from alumina fly ash; synthesizing the calcium silicate slurry under the condition that the temperature is 190DEG C to 250DEG C and the pressure is 1.3Mpa to 4.0Mpa to obtain xonotlite slurry, wherein the synthesizing time is 2h to 6h; adding 1 to 3 percent of fiber reinforced raw material and 0.5 to 3 percent of water glass into the xonotlite slurry; press-filtering, dehydrating, forming, demolding and drying. The preparation method of the calcium silicate insulation material is short in reaction time, low in energy consumption and good in production property.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to a preparation method of a calcium silicate thermal insulation material. Background technique [0002] Calcium silicate thermal insulation material is a kind of xonotlite as the main crystal phase (6CaO 6SiO 2 ·H 2 O) a thermal insulation material, which has been widely used. Traditional calcium silicate thermal insulation materials are mainly made of silica (quartz sand powder, diatomaceous earth), lime (also useful slaked lime, carbide slag, etc.) and reinforcing fibers (such as asbestos, glass fiber, etc.), according to Ca / The Si (molar ratio) is 0.9-1.1 to prepare raw materials, which are stirred to make a slurry with a liquid-solid ratio (mass ratio) of about 30, and hydrothermally synthesized xonotlite in a high-temperature and high-pressure reactor, and finally press-molded, A kind of heat-resistant insulation material made by drying and other processes. At ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B7/24
CPCY02P40/10
Inventor 杨志杰孙俊民苗瑞平
Owner DATANG INT HIGH ALUMINA COAL R & D CENT