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Fly ash aluminum extraction residue cement

A technology for extracting aluminum from fly ash and extracting aluminum residue is applied in the field of building materials, which can solve the problems of occupying land, secondary environmental pollution, affecting the economic benefits of extracting alumina from fly ash, etc. The effect of alleviating the shortage of mineral resources

Inactive Publication Date: 2011-12-14
INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Even so, this method will produce 2 to 2.5 tons of aluminum extraction residue with high alkali content per ton of alumina. If such a large amount of aluminum extraction residue with high alkali content cannot be utilized, it will not only take up a lot of land, but also affect the environment. Produce secondary pollution and affect the economic benefits of alumina extraction from fly ash
There is no report on the production of cement admixtures using fly ash soda lime sintering method to extract aluminum residue as raw material

Method used

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  • Fly ash aluminum extraction residue cement
  • Fly ash aluminum extraction residue cement
  • Fly ash aluminum extraction residue cement

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Experimental program
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Effect test

Embodiment 1

[0032] Calcium-silicate slag obtained by extracting alumina by soda-lime sintering of fly ash is processed through the following dealkalization process. 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 extracting aluminum residue is below 0.6%, which has a good application prospect in the cement building material industry from the perspective of physical and chemical properties. Then the above-mentioned fly ash extracting aluminum residue is dried, and the mass percentage of water in the fly ash extracting aluminum residue after drying is 2%, and the drying steps are as follows: the fly ash extracting alumi...

Embodiment 2

[0042] Different from Embodiment 1, the raw materials used in this embodiment include: fly ash aluminum extraction residue: 40 parts by weight, cement clinker (P.O52.5 cement clinker): 55 parts by weight, gypsum (industrial gypsum): 5 parts by weight were mixed, and then the prepared cement mixture was ground through a cement mill (ball mill) for 1 hour to obtain the fly ash aluminum extraction residue cement sample 2. After fine grinding, the particle size reached GB-T 21372-2008 silicate The particle size requirements in cement clinker, fly ash aluminum extraction residue cement sample 2 meets the performance requirements of ordinary Portland cement with a grade of 32.5. Its specific composition analysis results are shown in Table 3, and the physical performance indicators are shown in Table 4. Same as sample 1, fly ash aluminum extraction residue cement sample 2 has high early strength, and the strength increase is relatively stable without too much fluctuation. The initial...

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Abstract

The invention discloses a fly ash aluminum extraction residue cement, which is prepared from raw materials in the following weight proportions: 10-50 parts of fly ash aluminum extraction residue; 90-50 parts of clinker; and 1-5 parts of gypsum. After the above raw materials are mixed according to the ratio, they are sent to the cement mill, and the coarse powder is selected by the powder separator and returned to the cement mill, and the fine powder is directly sent to the cement storehouse to be the fly ash aluminum extraction residue cement. The performance of the fly ash aluminum extraction residue cement of the present invention meets the requirements of the 32.5 or 42.5 label. It overcomes many shortcomings of the prior art and realizes the advantages of simple and easy-to-obtain raw materials, scientific and reasonable process, small investment in equipment, good physical and chemical properties of cement, high early strength, and relatively stable strength increase.

Description

technical field [0001] The invention relates to building material technology, in particular to a fly ash aluminum extraction residue cement. Background technique [0002] In the existing cement preparation technology, industrial waste residues such as fly ash, coal gangue, and blast furnace slag are generally used as cement admixtures. However, cement admixtures prepared from these industrial wastes have disadvantages such as low early strength and affecting the physical performance indicators of cement. And in some places where industrialization is underdeveloped in my country, this kind of industrial waste is relatively rare, so the production of cement admixtures in these places is unsustainable due to the lack of suitable raw materials. [0003] On the other hand, with the increasing shortage of bauxite resources in my 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 Lat...

Claims

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Application Information

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IPC IPC(8): C04B7/24
CPCY02P40/145Y02P40/10
Inventor 孙振斌陈刚孙俊民张战军张晓云周立平洪景南李畅
Owner INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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