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Cement clinker and preparation method thereof

A technology for cement clinker and raw materials, applied in the direction of cement production, etc., can solve the problems affecting the economic benefits of extracting alumina from fly ash, cannot be applied, and secondary environmental pollution, and achieves saving energy consumption and reducing energy consumption. , The effect of fine grinding and low cost

Inactive Publication Date: 2012-02-08
INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, the soda lime sintering method will produce 2-2.5 tons of aluminum extraction residue per ton of alumina. If such a large amount of aluminum extraction residue cannot be used, it will not only occupy a large amount of land, but also cause secondary pollution to the environment and affect the powder Economic Benefits of Alumina Production by Extracting Coal Ash
The two types of aluminum extraction residues produced by fly ash soda-lime sintering method and limestone sintering method are quite different in chemical composition and phase composition. and cannot be applied

Method used

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  • Cement clinker and preparation method thereof
  • Cement clinker and preparation method thereof
  • Cement clinker and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] figure 1 The process flow chart of the cement clinker preparation method provided by Embodiment 1 of the present invention.

[0035] After the alumina is extracted by the soda-lime sintering method of fly ash, the main component is silicon-calcium residue, and the above residue is treated by dealkalization process to obtain the aluminum extraction residue of fly ash. The steps of the dealkalization process are as follows: (1) adding water to the aluminum extraction residue and stirring to obtain an aluminum extraction residue slurry; (2) slowly adding calcium carbide slag to the aluminum extraction residue slurry under stirring to carry out dealkalization; (3 ) filtering and washing the aluminum extraction residue slurry after the dealkalization reaction. The alkali content of fly ash aluminum extraction residue is below 0.6%, and its main chemical components are CaO and SiO 2 , the main phase of the aluminum extraction residue from fly ash is C2S (dicalcium silicate)...

Embodiment 2

[0047] Different from the embodiment, the raw material (raw meal) used in the embodiment includes: 80 parts by weight of fly ash aluminum extraction residue, 18 parts by weight of limestone, 2 parts by weight of iron ore mixed and homogenized, and the raw material after homogenization Take a small amount of material for particle size test, pass through a 100-mesh sieve, and 7.2% remains after sieving, which meets the particle size requirement of raw meal. Send the homogenized raw meal into a rotary kiln for high-temperature calcination at a temperature of 1360° C. After cooling, cement clinker S-2 is obtained.

[0048] The aluminum extraction residue from fly ash includes components in the following weight ratios: CaO: 56.71, SiO 2 : 25.36, Al 2 o 3 : 4.62, Fe 2 o 3 : 2.48, MgO: 2.03, Na 2 O+0.66K 2 O: 0.52, loss on ignition: 8.28.

[0049] The chemical composition and rate of the cement clinker S-2 prepared in this example are shown in Table 3, and the physical and mec...

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Abstract

The invention discloses cement clinker and a preparation method thereof. The cement clinker is prepared from the following raw materials in part by weight: 60-88 parts of aluminum extracted coal ash residue, 38-10 parts of limestone and 1-3 parts of iron ore. The preparation method of the cement clinker comprises the following steps of: firstly, grinding the raw materials; then, homogenizing the ground raw materials; and finally calcining the raw materials to obtain the cement clinker. The invention overcomes various defects in the prior art, simple raw materials and high utilization rate are realized, and the traditional cement production process does not need to be improved. The obtained portland cement has high early strength, and the amount of strength increase is stable without great fluctuations. Compared with the traditional cement clinker production process, the preparation method can enable the consumption of limestone for each ton of cement clinker is lowered by 60-90%, the emission amount of CO2 is lowered by 60-90%, energy consumption is lowered by more than 30%, and the production capacity of single kiln is improved by 30%. The preparation method is a cyclic and economic project tightly linked to aluminum extraction from coal ash.

Description

technical field [0001] The invention relates to building material technology, in particular to a cement clinker and a preparation method thereof. Background technique [0002] With the increasing shortage of bauxite resources in our country, the use of fly ash, coal gangue and other industrial solid wastes to extract alumina has attracted more and more attention. For example, the Late Paleozoic coal seams and gangue in the Ordos Basin are rich in boehmite and kaolinite and other minerals, and the alumina content in the fly ash produced after combustion is as high as about 50%, which is comparable to that in medium-grade bauxite. The content is equivalent, and it is a very valuable raw material for alumina production. According to statistics, the potential reserves of high-aluminum fly ash in the central and western regions of Inner Mongolia are as high as 15 billion tons. With the increasing shortage of bauxite resources in our country, the extraction of alumina from other...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 闫绍勇陈刚孙俊民张国希张战军周立平洪景南张晓云高峰
Owner INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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