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Preparation method for cement clinker

A cement clinker and raw material technology, applied in cement production, etc., can solve the problems that affect the economic benefits of extracting alumina from fly ash, cannot be used, and the secondary pollution of the environment, so as to realize resource utilization, facilitate implementation and promotion, The effect of low consumption

Inactive Publication Date: 2015-06-10
青岛昊河水泥制品有限责任公司
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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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  • Preparation method for cement clinker
  • Preparation method for cement clinker
  • Preparation method for cement clinker

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: The main component obtained after the extraction of alumina by fly ash soda lime sintering method is the residue of silicon calcium, and the above residue is processed through the 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 the aluminum extraction residue slurry; (2), under the condition of stirring, slowly adding calcium carbide slag to the aluminum extraction residue slurry to carry out dealkalization reaction; (3), mixing The aluminum extraction residue slurry after the dealkalization reaction is filtered and washed. The alkali content of the fly ash aluminum extraction residue obtained after the above process is below 0.6%, and its main chemical components are CaO and SiO 2 , the main phase of fly ash aluminum extraction residue is C 2 S, accounts for 72%-78% of the total weight of the al...

Embodiment 2

[0037] Embodiment 2: Different from Embodiment 1, the raw materials used in this embodiment include 75 parts by weight of fly ash aluminum extraction residue, 20 parts by weight of limestone, and 2 parts of iron ore are mixed and homogenized, and the homogenized raw materials Take a small amount for particle size test, pass through a 100-mesh sieve, and 7.3% remains after sieving, which meets the particle size requirements of raw materials. The homogenized raw materials are sent to a rotary kiln for high-temperature calcination at a temperature of 1300°C, and cement clinker is obtained after cooling.

[0038] The aluminum extraction residue from fly ash includes components in the following weight ratios: CaO: 53.10, SiO 2 : 21.40, Al 2 o 3 : 4.12, Fe 2 o 3 : 1.83, MgO: 2.16, Na 2 O+0.66K 2 O: 0.48, water <30, loss on ignition: 8.21.

[0039] The chemical composition and rate of the cement clinker prepared in this example are shown in Table 3, and the physical and mechan...

Embodiment 3

[0044] Embodiment 3: Different from the above two embodiments, the raw materials used in this embodiment include 80 parts by weight of fly ash aluminum extraction residue, 17 parts by weight of limestone, and 1.3 parts of iron ore mixed and homogenized. Take a small amount of the raw material for particle size test, pass through a 110-mesh sieve, and the remaining 7.1% of the sieve meets the particle size requirements of the raw material. The homogenized raw materials are sent to a rotary kiln for high-temperature calcination at a temperature of 1300°C, and cement clinker is obtained after cooling.

[0045] The aluminum extraction residue from fly ash includes components in the following weight ratios: CaO: 54.70, SiO 2 : 23.60, Al 2 o 3 : 3.87, Fe 2 o 3 : 2.12, MgO: 2.54, Na 2 O+0.66K 2 O: 0.57, water <30, loss on ignition: 8.32.

[0046] The chemical composition and ratio of the cement clinker prepared in this example are shown in Table 5, and the physical and mechani...

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Abstract

The invention discloses a preparation method for cement clinker. The method comprises the following steps: (1) preparation of raw materials: a step of compounding residues obtained after extraction of aluminum from fly ash, limestone and iron ores according to a weight ratio of 65-85: 40-15: 1-3; (2) refinement of the raw materials: a step of placing the above-mentioned raw materials into a grinding machine for fine grinding; (3) homogenization of the raw materials: a step of homogenizing the ground raw materials; and (4) calcination of the raw materials: a step of calcining the homogenized raw materials so as to obtain the cement clinker. The preparation method for the cement clinker provided by the invention employs simple and easily-available raw materials, is simple, has low energy consumption and can be conveniently implemented and popularized.

Description

technical field [0001] The invention relates to a method for preparing cement clinker, which belongs to the technical field of building materials. 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. The relatively mature production method for extracting alumina from fly ash is the alkali method, and the alkali method is divided into limestone sintering method and soda lime sintering method. In the prior art, the aluminum extraction residue produced by extracting alumina from fly ash by limestone sintering method is close to the composition of cement clinker and has low alkali content. There are many studies on the use of it to produce cement clinker, but the powdered coal The main phase of aluminum extraction residue produced by limestone sintering method is 2CaO·SiO 2 and 4CaO·Al 2 o 3 · Fe 2 o 3 , alth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/17
CPCY02P40/10
Inventor 王传波王风民田斌邓国威崔凯
Owner 青岛昊河水泥制品有限责任公司
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