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Performance adjustment material for activating steel slag at high temperature and application thereof

A high-temperature activation and steel slag technology, applied in the field of steel slag cementitiousness, can solve the problems of little significance for large-scale application of steel slag, little room for performance improvement, and insufficient congenitality of steel slag, so as to improve hydration and gelation activity, Guarantee the cementitious performance and save the amount of cement

Inactive Publication Date: 2011-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above activation measures belong to the "back-end" treatment technology, which is a traditional method. It is mainly based on the use of effective or potential cementitious components contained in steel slag. However, due to the congenital deficiency of steel slag in terms of activity, performance improvement There is not much space for this method, and each method has certain limitations and is not universal, so it has little significance for the large-scale application of steel slag in the cement and concrete industries.

Method used

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  • Performance adjustment material for activating steel slag at high temperature and application thereof
  • Performance adjustment material for activating steel slag at high temperature and application thereof
  • Performance adjustment material for activating steel slag at high temperature and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] The parts by weight of each component of the performance adjustment material are as follows:

[0038] 95 parts (95 grams) of electric furnace reduced slag

[0039] 5 parts plastic-retaining starch (5g)

[0040] Applications of performance modulating materials:

[0041] 1. Mix the performance-adjusting material with the steel slag from Shaoguan Iron and Steel Company according to the following parts by weight:

[0042] Performance adjustment material 10 parts (100 grams)

[0043] Shaoguan Iron and Steel Company steel slag 90 parts (900 grams)

[0044] 2. Heat the mixture at 900°C for 60 minutes, so that the performance-adjusting material and steel slag undergo a reconstitution chemical reaction;

[0045] 3. The jaw crusher is used for crushing, and the reconstituted steel slag is separated by magnetic separation; finally, it is ground to a specific surface area of ​​415m 2 / kg.

example 2

[0047] In this example, the chemical composition related to coal slag is as follows: (weight percent %)

[0048] The parts by weight of each component of the performance adjustment material are as follows:

[0049] 70 parts (140 grams) of electric furnace reduced slag

[0050] 27 cinders (54 grams)

[0051] 3 parts thickening starch (6g)

[0052] Applications of performance modulating materials:

[0053] 1. Mix the performance-adjusting material with the steel slag from Shaoguan Iron and Steel Company according to the following parts by weight:

[0054] 20 servings (200 grams) of performance conditioning material

[0055] Shaoguan Iron and Steel Company steel slag 80 parts (800 grams)

[0056] 2. Heat the mixture at 1150°C for 45 minutes to make the performance-adjusting material and steel slag undergo a reconstitution chemical reaction;

[0057] 3. The jaw crusher is used for crushing, and the reconstituted steel slag is separated by magnetic separation; finally, it is ...

example 3

[0059] The parts by weight of each component of the performance adjustment material are as follows:

[0060] Electric furnace reduced slag 50 parts (150 grams)

[0061] Cinder 49.5 parts (148.5 grams)

[0062] 0.5 parts (1.5 grams) of polyvinyl alcohol

[0063] Applications of performance modulating materials:

[0064] 1. Mix the performance-adjusting material with the steel slag from Shaoguan Iron and Steel Company according to the following parts by weight:

[0065] 30 servings (300 grams) of performance conditioning material

[0066] Shaoguan Iron and Steel Company steel slag 70 parts (700 grams)

[0067] 2. Heat the mixture at 1250°C for 30 minutes to make the performance-adjusting material and steel slag undergo a reconstitution chemical reaction;

[0068] 3. The jaw crusher is used for crushing, and the reconstituted steel slag is separated by magnetic separation; finally, it is ground to a specific surface area of ​​436m 2 / kg.

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Abstract

The invention discloses a performance adjustment material for activating steel slag at high temperature and the application thereof. The performance adjustment material is prepared by mixing electric arc furnace restored slag, coal slag and starch polymer or poval. The application of the material is as follows: after being mixed, the performance adjustment material and the steel slag chemically react under the action of high temperature so as to improve the hydration and the cohesive activity of the steel slag. The invention utilizes the electric arc furnace restored slag, the coal slag and a small quantity of starch polymer or poval to prepare the performance adjustment material; and the performance adjustment material and the steel slag are mixed and chemically react at the certain temperature so as to improve the hydration and the cohesive activity of the converter steel slag. After reaction, the content of free calcium oxide in the steel slag is lower than 2 percent; and when the specific surface area of steel slag powder ranges from 400 to 500m<2> / kg after activation, the 28d activity index is higher than 85 percent. The activated steel slag powder prepared by the invention can be used as cement admixture or concrete admixture, and can be widely applied to the construction projects of industrial and civil architecture, water conservancy, roads, airports, etc.

Description

technical field [0001] The invention relates to the technical field of steel slag gelling properties, in particular to a performance-adjusting material for high-temperature activation treatment of steel slag and its application. Background technique [0002] Steel slag, as waste slag during steelmaking, generally accounts for about 20% of crude steel output. In recent years, with the rapid development of my country's iron and steel industry, the accumulation of steel slag has increased year by year, which not only occupies a large amount of land, but also causes serious environmental pollution. The mineral composition of converter steel slag is mainly composed of tricalcium silicate, dicalcium silicate, calcium ferrite, iron oxide, free calcium and RO, among which silicate minerals are gelling active minerals. Therefore, steel slag is used as cement admixture Or concrete admixtures and other aspects have good utilization potential. However, due to the presence of mineral p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C22B1/244
CPCY02W30/50
Inventor 余其俊李建新韦江雄赵三银赵旭光殷素红钟根宫晨琛
Owner SOUTH CHINA UNIV OF TECH
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