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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 space for performance improvement, and congenital deficiency of steel slag, so as to ensure gelling performance and avoid direct losses , to achieve the effect of reuse

Inactive Publication Date: 2011-04-27
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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  • 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 slag discharge capacity of the converter steel slag is 3 tons, and the performance adjustment material is 10% of the steel slag weight.

[0030] Mix electric furnace reduction slag, coal slag, and additives according to the following parts by weight to prepare performance-adjusting materials:

[0031] Electric furnace reduced slag 70 parts (210 kg)

[0032] Cinder 25 parts (75 kg)

[0033] 5 parts plastic-retaining starch (15 kg)

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

[0035] The property-adjusting material and steel slag are mixed by the impact force of molten steel slag pouring.

[0036] The mixed performance adjusting material and steel slag were heated in a slag ladle for 8 hours.

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

Embodiment 2

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

[0040] Mix electric furnace reduction slag, coal slag, and additives according to the following parts by weight to prepare performance-adjusting materials:

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

[0042] 17 cinders (76.5 kg)

[0043] 3 parts thickening starch (13.5 kg)

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

[0045] The property-adjusting material and steel slag are mixed by the impact force of molten steel slag pouring.

[0046] The mixed performance adjusting material and steel slag were hot stuffed in a slag ladle for 12 hours.

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

Embodiment 3

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

[0050] Mix electric furnace reduction slag, coal slag, and additives according to the following parts by weight to prepare performance-adjusting materials:

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

[0052] Cinder 7 parts (42 kg)

[0053] 3 parts (18 kg) plastic-proof thickening starch

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

[0055] The property-adjusting material and steel slag are mixed by the impact force of molten steel slag pouring.

[0056] The mixed performance adjusting material and steel slag were hot stuffed in a slag ladle for 18 hours.

[0057] Under the waste heat of the molten steel slag, the 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<2> / 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, in particular to a method for activating and modifying steel slag by using the waste heat of converter steel slag. 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 phases ...

Claims

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Application Information

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Patent Type & Authority Patents(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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