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A kind of method that utilizes disodium calcium silicate to prepare xonotlite

A technology of disodium calcium silicate and xonotlite, which is applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of long production time, high production cost, and long time, and achieve short reaction time and raw materials And production and processing cost reduction, the effect of stable performance

Active Publication Date: 2018-01-12
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

However, the siliceous raw materials used in this method are mostly solid materials such as crystallized quartz sand or expensive white carbon black, and the required time for the reaction process is longer; therefore, the production of xonotlite by using the prior art The method has disadvantages such as high production cost and long production time

Method used

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  • A kind of method that utilizes disodium calcium silicate to prepare xonotlite
  • A kind of method that utilizes disodium calcium silicate to prepare xonotlite
  • A kind of method that utilizes disodium calcium silicate to prepare xonotlite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material disodium calcium silicate used in this example comes from the dissolution of NaAlO from soda lime sintered clinker 2 The chemical composition of the remaining filter residue is shown in Table 1.

[0027] The chemical composition of table 1 disodium calcium silicate raw material (content unit: wt %)

[0028]

[0029]

[0030] Utilize above-mentioned disodium calcium silicate to prepare the method for xonotlite, specifically:

[0031] Take caustic soda with a purity of 99wt%, fully dissolve it in 600g of distilled water, and prepare about 600mL of sodium hydroxide solution with a concentration of about 50g / L for subsequent use.

[0032] Weigh about 20.0 g of the above disodium calcium silicate, add it to the 600 mL sodium hydroxide solution prepared above, stir evenly, place it in an experimental high-pressure reactor with an effective volume of 1 L, and control the absolute pressure of the reaction to 2.5MPa, and stirring at a speed of about 100r...

Embodiment 2

[0037] The raw material disodium calcium silicate used in this example comes from the dissolution of NaAlO from soda lime sintered clinker 2 The chemical composition of the remaining filter residue is shown in Table 2.

[0038] The chemical composition of table 2 calcium disodium silicate raw material (content unit: wt %)

[0039] Element

Na 2 o

CaO

SiO 2

Al 2 o 3

K 2 o

MgO

Fe 2 o 3

LOI

content

22.37

29.45

30.86

2.04

0.84

0.89

0.82

11.87

[0040] Utilize above-mentioned disodium calcium silicate to prepare the method for xonotlite, specifically:

[0041] Take caustic soda with a purity of 99wt%, fully dissolve it in 800g of distilled water, and prepare about 800mL of sodium hydroxide solution with a concentration of about 10g / L for subsequent use.

[0042]Weigh about 20.0 g of the above disodium calcium silicate, add it to the 800 mL sodium hydroxide solution prepared above, stir evenl...

Embodiment 3

[0046] The raw material disodium calcium silicate used in this example comes from the dissolution of NaAlO from soda lime sintered clinker 2 The chemical composition of the remaining filter residue is shown in Table 3.

[0047] The chemical composition of table 3 disodium calcium silicate raw material (content unit: wt%)

[0048] Element

Na 2 o

CaO

SiO 2

Al 2 o 3

K 2 o

MgO

Fe 2 o 3

LOI

content

21.09

29.00

29.32

2.78

0.67

0.71

0.93

14.87

[0049] Utilize above-mentioned disodium calcium silicate to prepare the method for xonotlite, specifically:

[0050] Take caustic soda with a purity of 99wt%, fully dissolve it in 500g of distilled water, and prepare about 500mL of sodium hydroxide solution with a concentration of about 20g / L for subsequent use.

[0051] Weigh about 20.0 g of the above disodium calcium silicate, add it to the 500 mL sodium hydroxide solution prepared above, stir evenl...

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Abstract

The invention provides a method for preparing xonotlite from disodium silicate calcium. The method comprises the following steps that disodium silicate calcium and a sodium hydroxide solution are mixed, and the mixture is heated to reach the temperature of 200-260 DEG C through a temperature-gradient method and subjected to a heat-preserved reaction for 1-8 h; a reaction product is filtered and dried in sequence, and xonotlite is obtained. Alkali-containing industrial waste residue containing disodium silicate calcium is adopted as a raw material, the raw material is low in cost, easy to obtain and stable in performance, and therefore the production cost of the xonotlite is greatly reduced; in addition, the method is easy to operate, short in reaction time and particularly suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of xonotlite, in particular to a method for preparing xonotlite by using disodium calcium silicate. Background technique [0002] Xonotlite (Ca 6 [Si 6 o 17 ](OH) 2 ) is the main mineral component of calcium silicate insulation materials, and the temperature of the insulation materials composed of it can reach above 1000°C. It is used as the main raw material for lightweight thermal insulation and fireproof materials. [0003] At present, the preparation method of xonotlite is mainly the hydrothermal synthesis method, in which the xonotlite is obtained by mixing the calcareous raw material and the siliceous raw material in a certain proportion and then placing them in a high-pressure reactor for reaction. However, the siliceous raw materials used in this method are mostly solid materials such as crystallized quartz sand or expensive white carbon black, and the required time for the reaction process is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
CPCC01B33/24C01P2002/72C01P2004/03C01P2006/32
Inventor 洪景南孙俊民高志军胡剑王娜杨会宾许学斌李运改
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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