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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, long time, etc., achieve stable performance and reduce production Cost, effect of improving physical 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

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 residue is shown in Table 1.

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

[0028] Element

Na 2 o

CaO

SiO 2

al 2 o 3

K 2 o

MgO

Fe 2 o 3

LOI

content

23.16

29.86

31.58

2.54

0.92

0.86

0.79

9.57

[0029] 1. Preparation of hydrated calcium silicate

[0030] Take caustic soda with a purity of 99wt%, fully dissolve it in 400g of distilled water, and prepare about 400mL of sodium hydroxide solution with a concentration of about 50g / L for subsequent use.

[0031] Weigh about 100.0g of the above disodium calcium silicate, add it to the 400mL sodium hydroxide solution prepared above, stir evenly, place it in an experimental high-pressure reactor with an effe...

Embodiment 2

[0042] 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 waste residue is shown in Table 3.

[0043] The chemical composition of table 3 disodium calcium silicate raw material (content unit: wt%)

[0044] 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

[0045] 1. Preparation of hydrated calcium silicate

[0046] 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 80g / L for subsequent use.

[0047] Weigh about 100.0 g of the above disodium calcium silicate, add it to the 500 mL sodium hydroxide solution prepared above, stir evenly, place it in an experimental high-pressure reactor with...

Embodiment 3

[0057] 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 waste residue is shown in Table 5.

[0058] The chemical composition of table 5 disodium calcium silicate raw material (content unit: wt%)

[0059] 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

[0060] 1. Preparation of hydrated calcium silicate

[0061] 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 60g / L for subsequent use.

[0062] Weigh about 200.0g of the above disodium calcium silicate, add it to the 600mL sodium hydroxide solution prepared above, stir evenly, place it in an experimental high-pressure reactor with a...

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Abstract

The invention provides a method for preparing xonotlite from calcium disodium silicate. The method comprises 1, mixing calcium disodium silicate and a sodium hydroxide solution, carrying out a reaction process at a temperature of 120-200 DEG C for 0.5-3h and orderly filtering and drying the reaction product to obtain a calcium silicate hydrate and 2, mixing the calcium silicate hydrate and water, carrying out gradient heating to a temperature of 200-260 DEG C, carrying out a thermal insulation reaction process for 1-8h and orderly filtering and drying the reaction products to obtain xonotlite. The method utilizes calcium disodium silicate-containing alkali-containing industrial residue as a raw material which has a low price and stable performances so that a xonotlite production cost is greatly reduced. The method can be operated by simple processes and has short reaction time. Alkali in calcium disodium silicate can be recovered and recycled in a form of a high concentration caustic solution so that the method is 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
CPCC01B33/24C01P2002/72C01P2004/03
Inventor 洪景南孙俊民高志军王娜许学斌杨会宾李运改
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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