Coal-firing efficient additive for dry cement process and its use

A technology for coal-fired additives and dry-process cement, which is applied in the fields of fuel additives, fuel, and petroleum industries, can solve the problems of high price and high dosage, and achieve the effects of low cost, simple preparation process, and improved strength.

Inactive Publication Date: 2007-12-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, most of the commercially available combustion aids have disadvantages such as high dosage, high price and selectivity to coal types.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 25kg of steel slag powder from Wuhan Iron and Steel Group Corporation, 40kg of dry high-calcium fly ash collected by the dust collector of Wuchang Power Plant, 20 kg of barium slag, 5kg of commercially available potassium permanganate, 2kg of modified papermaking wastewater, and 8kg of citric acid, mix and grind into 180-200 mesh powder materials to make coal-fired additives. The modified papermaking wastewater is 250ml of papermaking black liquor, 10g of sulfonating agent (concentrated sulfuric acid) is added, the sulfonation reaction time is 30 minutes, and the condensation reaction time is 2 hours.

[0026] Taking high-ash coal with ash content as high as 40% as the research object, the ignition temperature (Ta) of high-ash coal is 458.5°C, and when the pulverized coal sample is mixed with 3% of this coal-burning additive, the ignition temperature of coal is reduced to 402.8°C ℃. The results of clinker firing show that the coagulation time, alkali content and s...

Embodiment 2

[0028] Get 25kg of steel slag powder from Wuhan Iron and Steel Group Corporation, 35kg of dry high-calcium fly ash collected by the dust collector in Wuchang Power Plant, 20kg of barium slag, 8kg of commercially available potassium permanganate, 2kg of modified papermaking wastewater, and 10kg of citric acid, mix and grind into 180-200 mesh powder materials to prepare coal-fired additives. The modified paper-making wastewater is prepared by adding 10 g of sulfonating agent (concentrated sulfuric acid) to 250 ml of paper-making black liquor, the sulfonation reaction time is 30 minutes, and the condensation reaction time is 2 hours.

[0029] Taking low-quality anthracite coal with ash content as high as 30% and volatile content as low as 8% as the research object, the ignition temperature (Ta) of high-ash coal is 496.5°C. The ignition temperature was lowered to 422.8°C. The results of clinker firing show that: the coagulation time, alkali content and stability of the clinker us...

Embodiment 3

[0031] Get 30kg of steel slag powder from Wuhan Iron and Steel Group Company, 50kg of dry high-calcium fly ash collected by the dust collector in Wuchang Power Plant, 12kg of barium slag, 5kg of commercially available potassium permanganate, 1kg of modified papermaking wastewater, and 5kg of citric acid, mix and grind into 180-200 mesh powder materials to prepare coal-fired additives. The modified paper-making wastewater is prepared by adding 10 g of sulfonating agent (sodium sulfite) to 250 ml of paper-making black liquor, the sulfonation reaction time is 30 minutes, and the condensation reaction time is 2 hours.

[0032] Taking bituminous coal as the research object, the ignition temperature (Ta) of bituminous coal is 420°C, and when the pulverized coal sample is mixed with 4% of the original coal combustion additive, the ignition temperature of coal is reduced to 400°C. The results of clinker firing show that the coagulation time, alkali content and stability of the clinker...

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Abstract

The invention belongs to coal additive field, especially a dry method concrete technology burning high efficiency additive. The feature is that it is made up of 20-30 portions of steel ground slag, 10-30 portions of barium slag, 5-10 portions of potassium permanganate, 1-2 portions of modification paper making sewage, 5-10 portions of citric acid, and 30-50 portions of high calcium fly ash. It could enhance the fire feature, and decline the firing temperature and no negative effect to concrete clinker aggregate.

Description

technical field [0001] The invention belongs to the field of coal-burning additives, and in particular relates to a novel dry-process cement process coal-burning additive and its application. Background technique [0002] In 2004, my country's total cement output reached 970 million tons, and the total energy consumption of cement reached more than 100 million tons of standard coal, accounting for 10% of the country's total coal output. Therefore, the development of the cement industry, which is high in energy consumption and low in output, will be restricted under the situation of increasingly tense energy consumption in various countries. At present, although my country's coal resources are quite rich, with proven reserves of more than 4.5 trillion tons, ranking first in the world, the distribution of resources is very uneven, with less in the east and more in the west, and more in the south and north. The distribution of coal varieties in my country is also very uneven. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L10/00
Inventor 马保国李相国李叶青徐立胡贞武
Owner WUHAN UNIV OF TECH
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