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Method for preparing tobermorite by using silicon-calcium slag

A technology of tobermorite and calcium silicate slag, which is applied in the field of preparing tobermorite with calcium silicate slag, which can solve the problems of high raw material requirements, long time required, and increased production costs, and achieve easy operation and low cost , the effect of improving production efficiency

Active Publication Date: 2017-07-21
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

Most of the calcium-containing raw materials used in the above method are obtained through a strict calcination process through crystallized limestone, which has relatively high requirements for raw materials, thereby greatly increasing production costs; The reaction usually takes more than 16 hours

Method used

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  • Method for preparing tobermorite by using silicon-calcium slag
  • Method for preparing tobermorite by using silicon-calcium slag
  • Method for preparing tobermorite by using silicon-calcium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The silicon-calcium slag used in this example was taken from an alumina plant in Hohhot, Inner Mongolia, and the quartz sand was taken from the Kubuqi Desert in Ordos, Inner Mongolia. The chemical compositions are shown in Table 1 and Table 2, respectively.

[0032] Table 1 Chemical composition of silicon calcium slag

[0033] Calcium silicon slag CaO SiO 2

al 2 o 3

Fe 2 o 3

Na 2 o

MgO Content (wt%) 56.28 27.54 6.23 1.33 2.98 1.78

[0034] Table 2 Chemical composition of quartz sand

[0035]

[0036]

[0037] First, mix 100 parts by weight of the above-mentioned calcium silicate slag with 29 parts by weight of the above-mentioned quartz sand, and then use a ball mill to grind the mixture until all particle sizes are less than 0.2 mm to obtain a mixture; the molar ratio of calcium to silicon in the mixture is 1:0.9.

[0038] Add 1935 parts by weight of water (with a liquid-solid ratio of 15) to the above mixt...

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 chemical compositions are shown in Table 3 and Table 4, respectively.

[0043] Table 3 The 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 (wt%) 58.29 25.45 5.83 1.83 3.56 0.82

[0045] Chemical composition of table 4 silica fume

[0046] Silica fume CaO SiO 2

Al 2 o 3

Fe 2 o 3

Na 2 o

MgO Content (wt%) 2.78 89.27 2.98 1.64 1.57 1.25

[0047] First, mix 100 parts by weight of the above-mentioned calcium silicate slag and 31.9 parts by weight of the above-mentioned silica fume, and then use a ball mill to grind the mixture until all particle sizes are less than 0.15mm to obtain a mixture; the...

Embodiment 3

[0052] The silicon-calcium slag used in this example was taken from an alumina plant in Hohhot, Inner Mongolia, and the white carbon black was self-made by injecting carbon dioxide into desilication lye, and its 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 (wt%) 55.74 27.89 5.96 1.57 2.87 1.05

[0055] Table 6 Chemical composition of white carbon black

[0056] Silica CaO SiO 2

al 2 o 3

Fe 2 o 3

Na 2 o

MgO Content (wt%) 0.24 72.31 1.02 0.21 1.57 0.45

[0057] First, mix 100 parts by weight of the above-mentioned silicon-calcium slag and 34.2 parts by weight of the above-mentioned white carbon black, and then use a ball mill to grind the mixture until all particle sizes are less than 0.12 mm to obtain a mi...

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Abstract

The invention provides a method for preparing tobermorite by using silicon-calcium slag. The method comprises the following steps: (1) mixing and grinding a calcium-containing raw material and a silicon-containing raw material to obtain a mixture; (2) after mixing the mixture with water, carrying out hydro-thermal synthesis reaction, and filtering, washing and drying a reaction product to obtain the tobermorite, wherein the calcium-containing raw material is the silicon-calcium slag; and the silicon-containing raw material is selected from more than one of silicon ash, quartz sand, diatomite, silica gel and white carbon. The method is extensive in sources of raw materials, low in cost, simple in preparation process and short in synthesis reaction time; the production efficiency can be greatly improved; unit production costs are reduced; and the popularization and application prospect is good.

Description

technical field [0001] The invention relates to a method for preparing tobermorite, in particular to a method for preparing tobermorite by utilizing silicon-calcium slag. Background technique [0002] Tobermorite, Crestmorite, also known as Tobermorite, was first discovered in Scotland and is a rare hydrated calcium silicate mineral that exists in nature. The tobermorite existing in nature is mainly Tobermorite, whose ideal crystal formula is Ca 5 Si 6 o 16 (OH) 2 4H 2 O. Tobermorite mostly belongs to the orthorhombic crystal system, and its lattice constant is a 0 =1.13nm, b 0 = 0.73nm, c 0 = 2.26nm. According to the different properties exhibited during heating and dehydration, Tobermorite can be divided into two types, one dehydrates crystal water when heated at 300°C, d 002 value by reduced to Into Tobermorite, known as normal crystalline tobermorite, has a three-joint chain of silicon-oxygen tetrahedron in its structural layer, which is not connecte...

Claims

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Application Information

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IPC IPC(8): C01B33/24
CPCC01B33/24C01P2002/72C01P2006/82
Inventor 洪景南孙俊民高志军孙振斌杨会宾胡剑王娜许学斌张永珍
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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