Method for activating and modifying steel slag by residual heat of converter steel slag

A technology of converter steel slag and steel slag, which is applied in the field of utilization of converter steel slag, can solve the problems of little significance for large-scale application of steel slag, little room for performance improvement, congenital deficiency of steel slag, etc., to ensure gelling performance and avoid direct losses , to achieve the effect of reuse

Inactive Publication Date: 2009-10-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for activating and modifying steel slag by residual heat of converter steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The converter steel slag discharge volume is 3 tons, and the performance adjustment material is 10% of the steel slag weight.

[0030] The electric furnace reduction slag, coal slag, and admixture are mixed in the following parts by weight to prepare the performance adjustment material:

[0031] 70 parts of electric furnace reduction slag (210 kg)

[0032] 25 parts of cinder (75 kg)

[0033] Plasticity-preserving starch 5 parts (15 kg)

[0034] After the performance adjustment material is granulated, it is placed in a steel slag ladle.

[0035] Use the impact force of molten steel slag dumping to mix the performance adjustment material and steel slag.

[0036] Heat the mixed performance adjusting material and steel slag in a slag ladle for 8 hours.

[0037] Under the action of the residual heat of molten steel slag, a chemical reaction occurs between the steel slag and the performance regulating material.

Embodiment 2

[0039] The converter steel slag discharge volume is 3 tons, and the performance adjustment material is 15% of the steel slag weight.

[0040] The electric furnace reduction slag, coal slag, and admixture are mixed in the following parts by weight to prepare the performance adjustment material:

[0041] Electric furnace reduction slag 80 parts (360 kg)

[0042] 17 parts of cinder (76.5 kg)

[0043] Thickening starch 3 parts (13.5 kg)

[0044] After the performance adjustment material is granulated, it is placed in a steel slag ladle.

[0045] Use the impact force of molten steel slag dumping to mix the performance adjustment material and steel slag.

[0046] Heat the mixed performance adjusting material and steel slag in a slag ladle for 12 hours.

[0047] Under the action of the residual heat of molten steel slag, a chemical reaction occurs between the steel slag and the performance regulating material.

Embodiment 3

[0049] The converter steel slag discharge volume is 3 tons, and the performance adjustment material is 20% of the steel slag weight.

[0050] The electric furnace reduction slag, coal slag, and admixture are mixed in the following parts by weight to prepare the performance adjustment material:

[0051] Electric furnace reduction slag 90 parts (540 kg)

[0052] 7 parts of cinder (42 kg)

[0053] Plastic thickening starch 3 parts (18 kg)

[0054] After the performance adjustment material is granulated, it is transported to the steel slag ladle by a screw conveyor.

[0055] Use the impact force of molten steel slag dumping to mix the performance adjustment material and steel slag.

[0056] Heat the mixed performance adjusting material and steel slag in the slag ladle for 18 hours.

[0057] Under the action of the waste heat of molten steel slag, a chemical reaction occurs between the steel slag and the performance adjusting material.

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Abstract

The invention relates to a method for activating and modifying steel slag by the residual heat of converter steel slag, comprising the following steps: mixing and granulizing the performance adjusting material electric furnace reducing slag, coal slag and auxiliary material by weight parts; placing the dried performance adjusting material in a steel slag pack or conveying the same into the steel slag pack by a screw conveyer before the steel slag is discharged; mixing the performance adjusting material with the steel slag by using the impact force of the smelt steel slag dumpage; hot smoldering the mixed performance adjusting material and the steel slag in the slag pack for 8-24 hours; crushing the reconstructed steel slag by a jaw crusher followed by magnetic separating; and finally grinding until the specific surface area achieving 400-500m/kg to obtain the active steel slag micro powder. In the invention, the performance adjusting material is placed in the steel slag pack to be mixed with the smelt steel slag, and the performance adjusting material and the steel slag are reacted at a high temperature by using the residual heat of the smelt steel slag to improve the hydratation and cohesive activity of the converter steel slag.

Description

Technical field [0001] The invention relates to the technical field of utilization of converter steel slag, and specifically a method for activating and modifying the steel slag by using the waste heat of the converter steel slag. Background technique [0002] Steel slag is used as waste slag in steelmaking, and 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, not only occupying a large amount of land, but also causing serious environmental pollution. The mineral composition of converter steel slag is mainly tricalcium silicate, dicalcium silicate, calcium ferrite, iron oxide, free calcium and RO equal to each other. Among them, silicate minerals are gelling active minerals. Therefore, steel slag is used as a cement admixture. Or concrete admixtures and other aspects have good utilization potential. However, due to the presence of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C22B1/248C22B1/244
CPCY02W30/50
Inventor 韦江雄余其俊赵三银赵旭光
Owner SOUTH CHINA UNIV OF TECH
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