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Digesting agent for free calcium oxide and method for digesting free calcium oxide in high-calcium coal ash

A technology of free calcium oxide and digestion agent, which is used in the field of digestion agent for digestion of free calcium oxide and free calcium oxide in high-calcium fly ash, can solve the problem that the fly ash humidity adjustment process is not easy to operate, and the modified fly ash is not easy to operate. High cost, difficult to automate operations, etc., to achieve the effect of significant digestion, low cost, and good contact

Inactive Publication Date: 2008-08-27
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prominent feature of this method is the high cost of added chemical substances, resulting in the defect of high cost of modified fly ash
[0005] There is also a method of humidity control treatment, which has low direct cost, but the fly ash humidity control process is not easy to operate, and there are defects such as it is not easy to realize environmental protection automation in the process, which brings difficulties to large-scale production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A digestion agent for dissolving free calcium oxide, wherein the digestion agent is composed of a digestion agent directly soluble in water and water to form a spray digestion solution;

[0034] Or the digestion agent is composed of spray digestion liquid and water-insoluble solid digestion agent;

[0035] Said digestion agent directly soluble in water refers to triethanolamine, sodium sulfate, ferric sulfate, calcium sulfate, sodium hydroxide;

[0036] At least one of the above-mentioned digestion agents can be mixed with water to obtain a digestion solution, and the digestion solution contains 45% to 90% of water, 10% to 50% of triethanolamine; 0% to 10% of sodium sulfate; 0% to 10% iron sulfate; 0% ~ 20% calcium sulfate;

[0037] Wherein, triethanolamine can be triethanolamine chemical raw material, also can be the mixture of triethanolamine and triisopropanolamine polyol, calcium sulfate can be natural gypsum also can be thermal power plant desulfurization gypsum, ...

Embodiment 2

[0047] The digestion liquid contains 50%-80% of water, 15%-45% of triethanolamine; 2%-8% of sodium sulfate; 2%-8% of iron sulfate; 3%-18% of calcium sulfate.

Embodiment 3

[0049] The digestion liquid contains 60%-70% of water, 20%-35% of triethanolamine, 3%-6% of sodium sulfate, 3%-6% of iron sulfate and 5%-15% of calcium sulfate.

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Abstract

The invention discloses a digesting agent for digesting free calcium oxide and a method for digesting free calcium oxide in high calcium fly-ash, the digesting agent is spray digesting liquid composed of a digesting agent which can dissolve in water directly and water, or digesting liquid integrally composed of spray liquid and a water-insoluble solid digesting agent, wherein the digesting agent which can dissolve in water comprises triethanolamine, sodium sulfate, sodium sulfate, calcium sulfate and natrium hydroxydatum, the steps of the process are that during the process of ball milling for high calcium fly-ash, spraying the digesting liquid on a grinding mill, utilizing chemicals of the digesting agent in the digesting liquid and the mechanical action in the process of ball milling, and employing the evaporating action principle of the digesting liquid after the temperature of materials is increased in the process of ball milling, thereby achieving the digesting of the free calcium oxide in high calcium fly-ash. The digesting method is simple in process, fully utilizes the characteristic that temperature of materials is increased during the process of ball milling of fly ash, and employs mechanical action and chemical principle to achieve digesting of the free calcium oxide in high calcium fly ash, thereby avoiding impaction to the stability of cement and concrete.

Description

technical field [0001] The invention relates to a method for dissolving free calcium oxide, in particular to a dissolving agent for dissolving free calcium oxide for improving cement stability and a method for dissolving free calcium oxide in 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 problems with the volume stability of cement or concrete, and bring hidden dangers to construction projects. The content of free calcium oxide 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] There are many methods for the digestion of free calcium oxide in high-cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B20/02C04B22/14C04B22/06
CPCC04B18/08Y02W30/91C04B20/02
Inventor 赵鹏王文成陈剑宁
Owner CHANGAN UNIV
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