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Steel slag based mineral admixture, preparation method and application thereof

A mineral admixture, steel slag technology, applied in cement production and other directions, can solve the problems of insufficient total amount of gelling active minerals, high formation temperature of silicate minerals, and low gelling activity.

Inactive Publication Date: 2018-06-19
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with cement clinker, the total amount of gelling active minerals in steel slag is insufficient, and there are a large amount of gelling inactive minerals such as calcium aluminate and calcium magnesium rhodoxene, and the formation temperature of silicate minerals is high, crystallization is dense, and water slow cementation rate, resulting in low overall gelling activity; in addition, free CaO and RO in steel slag are potentially harmful to the volume stability of cement concrete
The above shortcomings severely limit the application of steel slag as a mineral admixture in cement concrete

Method used

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  • Steel slag based mineral admixture, preparation method and application thereof
  • Steel slag based mineral admixture, preparation method and application thereof
  • Steel slag based mineral admixture, preparation method and application thereof

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preparation example Construction

[0017] The invention provides a method for preparing a steel slag-based mineral admixture, comprising the following steps:

[0018] Calcining the raw material mixture including the steel slag and the tempering modifier in an inert gas atmosphere to obtain the steel slag-based mineral admixture;

[0019] The tempering modifier is one or a mixture of two or more of graphite, activated carbon, bituminous coal, anthracite, lignite, coke and coal gangue.

[0020] The composition and source of the steel slag are not particularly limited in the present invention, and the steel slag produced in the usual steelmaking process can be used, and usually the steel slag includes chemical components with the following mass content: Fe 2 o 3 15~25wt.%, CaO 45~55wt.%, SiO 2 10~20wt.%, Al 2 o 3 1~8wt.%. In the embodiment of the present invention, the steel slag preferably includes the following chemical components in mass content: Fe 2 o 3 20~22wt.%, CaO48~50wt.%, SiO 2 10~12wt.%, Al...

Embodiment 1

[0050] After crushing and grinding the steel slag, the Blaine specific surface area is 260m 2 / kg of steel slag powder; prepare the raw material mixture according to the following ratio: 93wt.% steel slag powder, 7wt.% graphite powder; the raw material mixture and the 7wt.% water of the raw material mixture are mixed evenly, and the YAW-300B type cement pressure The machine slowly pressurizes to make a material cake of Φ12cm×2cm, the pressing pressure is 100kN, and the pressing time is 30s; after drying, the raw material block is obtained;

[0051] The raw material block is placed in a high-temperature electric furnace, and the high-temperature electric furnace is vacuum degassed and nitrogen-filled in sequence, and then heated to 1400° C. under a nitrogen atmosphere for calcination, and the calcination time is 120 minutes;

[0052] After the calcination is completed, the calcined product is cooled to room temperature under a nitrogen atmosphere; the cooled product is crushed ...

Embodiment 2

[0056] After the steel slag and bituminous coal are crushed and ground respectively, the Blaine specific surface area is 260m 2 / kg and 230m 2 / kg of steel slag powder and bituminous coal powder; prepare the raw material mixture according to the following ratio: 90wt.% steel slag, 10wt.% bituminous coal; The cement press is slowly pressurized to make a cake of Φ12cm×2cm, the pressing pressure is 100kN, and the pressing time is 30s; after drying, the raw material block is obtained;

[0057] The raw material block is placed in a high-temperature electric furnace, and the high-temperature electric furnace is vacuum degassed and nitrogen-filled in sequence, and then heated to 1400° C. under a nitrogen atmosphere for calcination, and the calcination time is 120 minutes;

[0058] After the calcination is completed, the calcined product is cooled to room temperature under a nitrogen atmosphere; the cooled product is crushed by a jaw crusher and ground by a ball mill to obtain a Blai...

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Abstract

The invention provides a preparation method of a steel slag based mineral admixture. The method includes the steps of: calcining a mixture of steel slag and a conditioning modifier in an inert gas atmosphere to obtain the steel slag based mineral admixture. The conditioning modifier is one or a mixture of two or more of graphite, activated carbon, bituminous coal, anthracite, lignite, coke and coal gangue. The steel slag based mineral admixture obtained by the preparation method provided by the invention is compounded with cement in a mass ratio of 3:7 into a cementing material, GB / T 17671-1999 is employed to test the cementing performance of the cementing material, after 7d of curing, the cementing activity index can reach 97.1%, and after 28d of curing, the cementing activity index can reach 108%, therefore the mineral admixture obtained by the preparation method provided by the invention has excellent cementing activity.

Description

technical field [0001] The invention relates to the field of steel slag recycling, in particular to a steel slag-based mineral admixture and its preparation method and application. Background technique [0002] Steel slag is the waste slag discharged during the steelmaking process, which belongs to a large amount of industrial solid waste. The discharge of steel slag is generally about 15% to 20% of steel output. Since 2008, my country's annual output of crude steel has exceeded 500 million tons, reaching 808 million tons in 2016, and my country's steel slag discharge exceeded 100 million tons in the same year. The disposal and accumulation of a large amount of steel slag not only pollutes the environment but also takes up a large amount of land and causes a waste of resources. The main mineral composition of steel slag is: tricalcium silicate, dicalcium silicate, calcium magnesium olivine, calcium magnesium rhodoxene, calcium ferric aluminate and solid solution formed by ...

Claims

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Application Information

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IPC IPC(8): C04B5/06C04B7/147
CPCC04B5/06C04B7/147Y02P40/10
Inventor 赵三银黎载波贺图升赵旭光
Owner SHAOGUAN COLLEGE
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