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Method for altering steel slag into grain slag

A technology of steel slag and water slag, which is applied in the field of harmless treatment of metallurgical waste steel slag, can solve the problems of high cost and increased process, and achieve the effects of low cost, improved reaction degree and simple process

Inactive Publication Date: 2009-02-18
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] At present, there are foreign reports that directly add modifiers to the converter to modify the slag; there are studies on the stability of steel slag modified under different cooling parts, in order to increase the hydration and strength of steel slag, so that it can be quenched. There have been reports in the literature of granulation or granulation, but this method is costly and the process increases

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  • Method for altering steel slag into grain slag

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Effect test

Embodiment 2

[0024] Embodiment 2 of the method of the present invention: adding dry steel slag into liquid blast furnace slag at the slag ditch 1m away from the main iron ditch of the blast furnace. The dry powdered steel slag after iron selection is used above, and the particle size of the steel slag is less than 0.1mm. Steel slag is directly and evenly added to the liquid slag in the slag ditch through a feeding device protected by refractory materials. The weight of steel slag added is 25% of the weight of blast furnace slag, and water slag is obtained after cooling. Water slag was detected, and the stability was qualified.

[0025] Take 30 parts by weight of water slag after water quenching process, mix with 70 parts by weight of 325 cement, and add 25 parts by weight of cement at the same time to make a clean slurry test block. The 3-day compressive strength is 5.2MPa, the 7-day strength is 22.3MPa, and the 28-day strength is 40.3MPa. The stability is qualified. The stability is q...

Embodiment 3

[0026] Embodiment 3 of the method of the present invention: Add dry steel slag into liquid blast furnace slag at the slag ditch at a distance of 1.5m from the main iron ditch of the blast furnace. The dry powdered steel slag after iron selection is used above, and the particle size of the steel slag is less than 0.088mm. Steel slag is directly and evenly added to the liquid slag in the slag ditch through a feeding device protected by refractory materials. The weight of steel slag added is the weight of blast furnace slag, and water slag is obtained after cooling. Water slag was detected, and the stability was qualified.

[0027] Take 30 parts by weight of water slag after water quenching process, mix with 70 parts by weight of 325 cement, and add 25 parts by weight of cement at the same time to make a clean slurry test block. The 3-day compressive strength is 18.0MPa, the 7-day strength is 28.6MPa, and the 28-day strength is 53.7MPa. The stability is qualified.

Embodiment 4

[0028] Embodiment 4 of the method of the present invention: Add dry steel slag into liquid blast furnace slag at the slag ditch at a distance of 4.5m from the main iron ditch of the blast furnace. The dry powdered steel slag after iron selection is used above, and the particle size of the steel slag is less than 1 mm. Steel slag is directly and evenly added to the liquid slag in the slag ditch through a feeding device protected by refractory materials. The weight of steel slag added is 70% of the weight of blast furnace slag, and water slag is obtained after cooling. Water slag was detected, and the stability was qualified.

[0029] Take 30 parts by weight of water slag after water quenching process, mix with 70 parts by weight of 325 cement, and add 25 parts by weight of cement at the same time to make a clean slurry test block. The 3-day compressive strength is 18.0MPa, the 7-day strength is 22.5MPa, and the 28-day strength is 53.7MPa. The stability is qualified.

[0030...

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Abstract

The invention relates to a method for changing steel slag into grain slag, comprising the following steps: adding dry steel slag into liquid blast furnace slag and obtaining the grain slag after the cooling; the granularity of the steel slag grains is less than 3 mm. The invention directly adds the steel slag into the liquid slag, allows the steel slag to react with the blast furnace slag, eliminates residual calcium oxide of lime or dolomite used for steel making so as to obtain calcium silicate or dicalcium silicate through the reaction with the acid blast furnace slag, eliminates dissociative CaO, allowing the reaction of the steel slag so as to obtain the grain slag which can serve as the material needed in the cement industry after the water quenching.

Description

technical field [0001] The invention relates to a harmless treatment technology for metallurgical waste steel slag, in particular to a method for transforming steel slag into water slag. Background technique [0002] With the development of the national circular economy, it is required to realize the reuse of waste resources in the metallurgical industry, especially the reuse of metallurgical slag and waste gas has become the focus of circular economy in the metallurgical industry. The most critical factor for the comprehensive utilization of steel slag (converter slag) is the stability of steel slag. There are many reasons for affecting the stability, among which the hydration and decomposition of free calcium oxide is the main reason. The chemical composition of steel slag is shown in Table 1. The free calcium oxide in steel slag has been calcined at a high temperature of about 1700 ° C. It has a dense structure, coarse crystal particles, and an extremely slow hydration ra...

Claims

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Application Information

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IPC IPC(8): C04B5/00C04B7/147
CPCY02P40/10
Inventor 徐国涛袁凡成陈华圣王悦刘黎张洪雷
Owner WUHAN IRON & STEEL (GROUP) CORP
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