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Method for preparing xonotlite by using silicium-calcium slag

A technology of tobermorite and calcium silicate slag, applied in the field of thermal insulation materials, can solve the problems of high production cost of tobermorite, increased cost of raw materials, long production time, etc., so as to solve storage and environmental pollution, and reduce the cost of raw materials , easy to operate effect

Active Publication Date: 2017-05-31
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

In addition, since raw materials such as quicklime and quartz sand are usually used at present, the crystallization process is relatively long.
Therefore, the current method of producing xonotlite has the disadvantages of high production cost and long production time
[0006] In addition, since quicklime or slaked lime is currently used as the raw material of xonotlite, a large amount of limestone mines need to be mined, which not only increases the cost of raw materials, causes environmental pollution, but also easily leads to safety accidents
On the other hand, the massive exploitation of mine resources also brings resource crisis

Method used

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  • Method for preparing xonotlite by using silicium-calcium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The silicon-calcium slag used in this example is taken from an alumina plant in Hohhot, Inner Mongolia, which is a by-product of extracting alumina from fly ash by pre-desilication soda lime sintering method, and the quartz sand is taken from the Ordos area of ​​Inner Mongolia. The main chemical components of Buqi Desert are shown in Table 1 and Table 2 respectively.

[0033] Table 1 Chemical composition of silicon-calcium slag

[0034] Calcium silicon slag CaO SiO 2

Al 2 o 3

Fe 2 o 3

Na 2 o

MgO content(%) 56.28 27.54 6.23 1.33 2.98 1.78

[0035] Table 2 Chemical composition of quartz sand

[0036] Quartz sand CaO SiO 2

al 2 o 3

Fe 2 o 3

Na 2 o

MgO content(%) 1.67 93.79 0.84 2.64 0.21 0.25

[0037] Get the above-mentioned 100 parts by weight of silicon-calcium slag and 36.96 parts by weight of quartz sand and mix it, use a ball mill to grind it until the p...

Embodiment 2

[0042] The silicon-calcium slag used in this example was obtained from an alumina plant in Hohhot, Inner Mongolia, and the silica fume was obtained from a metallurgical group in Ordos, Inner Mongolia. The main chemical components are shown in Table 3 and Table 4, respectively.

[0043] Table 3 Chemical composition of silicon-calcium slag

[0044] Calcium silicon slag CaO SiO 2

Al 2 o 3

Fe 2 o 3

Na 2 o

MgO content(%) 58.29 25.45 5.83 1.83 3.56 0.82

[0045] Table 4 Chemical composition of silica fume

[0046] Silica fume CaO SiO 2

Al 2 o 3

Fe 2 o 3

Na 2 o

MgO content(%) 2.78 89.27 2.98 1.64 1.57 1.25

[0047] After taking the above-mentioned 100 parts by weight of calcium silicate slag and 42.88 parts by weight of silica fume and mixing them, use a ball mill to grind them until all particle sizes are less than 0.08mm, then add 0.4 parts by weight of calcium chlorid...

Embodiment 3

[0052] The silicon-calcium slag used in this example is taken from an alumina factory in Hohhot, Inner Mongolia, and it is prepared by the method described in Example 2 of the patent CN102249253A. The chemical composition is shown in Table 5 and Table 6, respectively.

[0053] Table 5 Chemical composition of silicon-calcium slag

[0054] Calcium silicon slag CaO SiO 2

Al 2 o 3

Fe 2 o 3

Na 2 o

MgO content(%) 55.74 27.89 5.96 1.57 2.87 1.05

[0055] Table 6 Chemical composition of silica

[0056] Silica CaO SiO 2

al 2 o 3

Fe 2 o 3

Na 2 o

MgO content(%) 0.24 72.31 1.02 0.21 1.57 0.45

[0057] Take the above-mentioned 100 parts by weight of silicon-calcium slag and mix 33.35 parts by weight of white carbon black, use a ball mill to grind it until all particle sizes are less than 0.08mm, then add 0.3 parts by weight of barium chloride, 0.2 parts by weight of oxychlori...

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Abstract

The invention provides a method for preparing xonotlite by using silicium-calcium slag. The method comprises the following steps: mixing the silicium-calcium slag, a siliceous raw material and an additive so as to obtain a mixture; and mixing the mixture with water according to the liquid-to-solid ratio of (10 to 40): 1, carrying out a dynamic hydrothermal synthetic reaction on the mixed reaction system, and carrying out filtering, washing and drying after the reaction is completed, thereby obtaining the xonotlite, wherein the mole ratio of CaO to SiO2 in the mixture is 0.95 to 1.25, and the additive accounts for 0% to 2% the total mass of the silicium-calcium slag and the siliceous raw material. The method for preparing the xonotlite by using the raw materials such as the silicium-calcium slag, provided by the invention, has the characteristics of low cost, short reaction time, low energy consumption, and the like, and the prepared xonotlite meets the requirements of standards of GB / T 10699-2015 calcium silicate heat-insulation products and can replace the existing xonotlite products. In addition, the method provided by the invention can be used for consuming a large amount of silicium-calcium slag, thereby having obvious social, economic and environmental benefits.

Description

technical field [0001] The invention relates to a preparation method of xonotlite, in particular to a method for preparing xonotlite by using silicon-calcium slag, which belongs to the field of thermal insulation materials. Background technique [0002] Calcium silicon slag is a by-product produced in the process of extracting alumina from high-alumina fly ash, coal gangue, and bauxite. For every 1.0 ton of alumina produced, about 2.8-3.0 tons of calcium silicate slag are produced. The main chemical components of the calcium-silicate slag produced during the production of alumina by fly ash soda-lime sintering are CaO and SiO 2 , the main phase β-C 2 The S content exceeds 70%. Untreated calcium-silicon slag is highly alkaline and difficult to reuse. If the calcium-silicon slag is stacked in the open air, it will easily cause pollution to the surrounding environment and groundwater resources. In order to solve the above problems, it is usually to build a silicon-calcium sl...

Claims

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Application Information

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IPC IPC(8): C04B28/18C04B111/28
CPCC04B28/188C04B2111/00017C04B2111/28C04B2201/20C04B2201/32C04B2201/50C04B14/06C04B18/0481C04B22/124C04B18/146C04B22/12
Inventor 洪景南孙俊民高志军孙振斌杨会宾朱应宝胡剑李运改许学斌公彦兵
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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