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Method for preparing high-calcium fly-ash cement with high-calcium fly-ash

A high-calcium fly ash and cement technology, which is applied in cement production and other directions, can solve the problems of difficult operation of fly ash humidity control process, high cost of modified fly ash, and difficult automatic operation, etc., and achieves remarkable digestion effect , Improve ball milling efficiency and reduce manufacturing cost

Inactive Publication Date: 2010-01-27
榆林恒源利尔新型建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding feature of this method is the high cost of the added chemical substances, resulting in the high cost of modified fly ash
[0008] There is also a method of humidity control treatment, which is simple and low in cost, but the process of fly ash humidity control is not easy to operate, and there are defects such as it is not easy to realize the automatic operation of environmental protection in the process, which brings difficulties to large-scale production.

Method used

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  • Method for preparing high-calcium fly-ash cement with high-calcium fly-ash
  • Method for preparing high-calcium fly-ash cement with high-calcium fly-ash

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Experimental program
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Effect test

Embodiment 1

[0029] Cement clinker is high-quality clinker produced by high-quality rotary kiln production lines.

[0030] Natural gypsum: Gypsum or anhydrite that should meet the requirements of GB / T 5483 Class G or Class A Class II (inclusive) or above. Industrial by-product gypsum: a by-product of industrial production with calcium sulfate as the main component. When industrial by-product gypsum is used, it must be tested and proved to be harmless to water performance.

[0031] The slag is granulated blast furnace slag conforming to GB / T203.

[0032] High-calcium ash is desulfurized high-calcium ash produced by thermal power plant fly ash or low-calcium fly ash with calcium oxide content greater than 10% through desulfurization and calcium enhancement.

[0033] The digestion agent is the liquid or solid free calcium oxide digestion material described in the patent application No. 200810017534.X. Implementation steps:

[0034] (1), at first a combustion chamber is set at the head of ...

Embodiment 2

[0039] 70 parts of cement clinker; 20 parts of high-calcium fly ash; 5 parts of gypsum; The sieve residue is less than 15% with a grinding particle size of 45 microns, and the obtained fly ash cement meets the indicators specified in GB 1344-1999 "National Standards for Slag Portland Cement, Pozzolanic Portland Cement and Fly Ash Portland Cement" , other steps are with embodiment 1.

Embodiment 3

[0041] Cement clinker: 65 parts; high-calcium fly ash 25 parts; gypsum 5 parts; blast furnace slag: 5 parts; external digestion agent is 1.5 parts of high-calcium fly ash weight; control the maximum temperature of the material in the mill to 150 ° C, The particle size of the cement is 45 microns, and the sieve residue is less than 15%. The obtained fly ash cement meets the provisions of GB 1344-1999 "National Standards for Slag Portland Cement, Pozzolanic Portland Cement and Fly Ash Portland Cement" The index, other steps are with embodiment 1.

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Abstract

The invention discloses a process for preparing high calcium fly ash cement by high calcium fly ashes. A combustion chamber is arranged at the head part of the existing ball mill for pre-mixing measured high calcium fly ashes and a digesting agent and then feeding measured cement clinker, gypsum, blast furnace slag, etc. into a ball mill for ball grinding; and the material temperature in the mill is rising under the mechanical action of the mill, additionally, the grinding head combustion chamber provides heat, so the water in the digestion solution is evaporated and the digestion solution and free calcium oxide in the high calcium fly ashes have the mechanical and chemical action, the free calcium oxide digestion is realized during the cement grinding process, and finally the high calcium fly ash cement is prepared. The process is simple and needs not to add the special high calcium ash treating process before producing the cement, the free calcium oxide digestion effect is obvious, the mixing amount of the high calcium ashes in the cement can be greatly increased and the cement manufacturing cost is reduced. The process overcomes the defect that the humidity-control and digestion of fly ash free calcium oxide need two to seven days, and can implement the continuous production, and the ball-milling efficiency of the cement mill is improved by over 10 percent in the meantime.

Description

technical field [0001] The invention relates to a preparation method of fly ash cement, in particular to a method for preparing high calcium fly ash cement with high calcium fly ash. Background technique [0002] As we all know, the fly ash with calcium oxide content greater than 10% (weight) in the fly ash is called high calcium fly ash. Because high calcium fly ash contains free calcium oxide, if it is directly used in cement and concrete, it will often cause unqualified volume stability of cement or concrete, and bring hidden dangers to construction projects. The content of free calcium oxide in ash is strictly limited. According to the national technical standards on high-calcium fly ash, most high-calcium fly ash cannot be directly added to cement or concrete, and high-calcium fly ash needs to be modified. [0003] According to relevant national standards, the hydraulic cementitious material made of Portland cement clinker, fly ash, and appropriate amount of gypsum is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/38
CPCC04B7/26Y02P40/10C04B7/38
Inventor 赵鹏王文成
Owner 榆林恒源利尔新型建材科技有限公司
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