Method for preparing cement by modified compound coal ash

A technology of cement preparation and fly ash, which is applied in the field of building materials, can solve the problems of polluted land and water sources, and achieve the effect of reducing the amount of use and improving the early activity

Active Publication Date: 2013-07-17
ZHEJIANG TIANDI ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At the same time, in the "Eleventh Five-Year" environmental plan, the country has increased investment in flue gas desulfurization projects in large coal-fired enterprises, and the efficient use of desulfurization gypsum, an industrial by-product, has aroused widespread concern. If it is not handled properly, flue gas desulfurization The project only transforms the form of pollution, but does not fundamentally solve the pollution of sulfur dioxide, and stacking up will pollute land, water and other precious resources more seriously.

Method used

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  • Method for preparing cement by modified compound coal ash
  • Method for preparing cement by modified compound coal ash
  • Method for preparing cement by modified compound coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Grind the fly ash separately to 400m 2 / kg, 500m 2 / kg, 550m 2 / kg, the three kinds of fly ash were mixed at the ratio of 17%:33%:50% to obtain compound fly ash. Use P·I62.5R cement clinker, after the cement is ground to 300m 2 After adding 20% ​​compound fly ash and adding 1.0% of fly ash mass desulfurization gypsum at the same time, mix and grind until the specific surface area is 400m 2 / kg, to prepare P·O52.5R cement. Its basic properties are shown in Table 1. As can be seen from Table 1, compared with the unmodified front fly ash, adopting the modification provided by the present invention and using method to use as admixture the performance of each age of preparing cement has improved respectively by 21%, 13%, 35%, 20% %, the effect is remarkable.

[0016] Table 1 Performance comparison of cement prepared with fly ash before and after modification

[0017]

Embodiment 2

[0019] Grind the fly ash separately to 400m 2 / kg, 500m 2 / kg, 550m 2 / kg, the three kinds of fly ash were mixed at a ratio of 15%:25%:60% to obtain compound fly ash. Use P·I62.5R cement clinker, after the cement is ground to 300m 2 After adding 40% compound fly ash and adding 1.0% of fly ash desulfurization gypsum at the same time, mix and grind until the specific surface area is 450m 2 / kg to prepare P·F42.5R cement. Its basic properties are shown in Table 2. As can be seen from Table 2, compared with the unmodified former fly ash, adopting the modification provided by the present invention and using method to use as admixture the performance of each age of preparing cement has improved respectively by 20%, 16%, 34%, 22% %, the effect is remarkable.

[0020] Table 2 Performance comparison of cement prepared with fly ash before and after modification

[0021]

Embodiment 3

[0023] Grind the fly ash separately to 400m 2 / kg, 500m 2 / kg, 550m 2 / kg, the three kinds of fly ash were mixed at the ratio of 17%:33%:50% to obtain compound fly ash. Use P·I52.5R cement clinker, after the cement is ground to 300m 2 After adding 40% compound fly ash and adding 2% of fly ash mass desulfurization gypsum at the same time, mix and grind until the specific surface area is 450m 2 / kg to prepare P·F42.5R cement. Its basic properties are shown in Table 3. As can be seen from Table 3, compared with the unmodified former fly ash, adopting the modification provided by the present invention and using method to use as admixture use the performance of each age of preparing cement to improve respectively 20%, 21%, 26%, 16%. %, the effect is remarkable.

[0024] Table 3 Performance comparison of cement prepared with fly ash before and after modification

[0025]

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Abstract

The invention discloses a method for preparing cement by modified compound coal ash. The method comprises the following steps of: grinding the coal ashes until the specific surface areas of the coal ashes reaches 350 m<2>/kg-600m<2>/kg; selecting the coal ashes with the specific surface areas of 350 m<2>/kg-400 m<2>/kg, 450 m<2>/kg-500 m<2>/kg and 550 m<2>/kg-600 m<2>/kg; compounding the coal ashes in a proportion of (15%-25%):(25%-40%):(40%-60%) to obtain the modified compound coal ash; adding the modified compound coal to cement clinker in a proportion of 20%-40%, and adding desulfurization gypsum which is 0.5%-2.5% of the weight of the compound coal ash for mixing and grinding. The method for preparing cement by modified compound coal ash can be used for optimizing the grain size distribution by improving the fineness of the coal ash, so that the activity of the coal ash is improved, and therefore, and energy conservation and emission reduction can be realized by largely utilizing industrial waste residues.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing modified and compounded fly ash for cement. Background technique [0002] Fly ash is one of the largest industrial wastes in my country. The annual discharge has exceeded 200 million tons, and the burden on the economy, society and environment is getting heavier. The research, development and utilization of fly ash in my country began in the 1950s, mainly focusing on the development and experimental research of cement and concrete, and has been widely used in engineering construction. However, cement mixtures and concrete admixtures have high requirements on the quality of fly ash, and at the same time, there are certain restrictions on the amount of fly ash. Only a small part of high-quality fly ash is allowed to be used in concrete structural engineering. Part of the fly ash cannot be effectively utilized in the cement system due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 卢永清俞海勇叶强王琼张林
Owner ZHEJIANG TIANDI ENVIRONMENTAL PROTECTION TECH CO LTD
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