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Method for preparing high-gelling-activity steel slag through high-temperature reconstruction of calcium-aluminum components and application thereof

A technology of steel slag and calcium aluminum, applied in the field of green building materials, can solve the problems that the chemical composition and mineral composition of steel slag have not been fundamentally changed, and the resource utilization rate of steel slag is less than 30%.

Inactive Publication Date: 2020-06-23
GUILIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resource utilization rate of steel slag in my country's current price segment is less than 30%
In short, the existing technologies for improving the gelling activity of steel slag only stop at regulating the fineness of steel slag or improving the hydration environment, and have not fundamentally changed the chemical composition and mineral composition of steel slag, and transformed the RO phase in steel slag For gelling active minerals, improve the gelling activity of steel slag

Method used

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  • Method for preparing high-gelling-activity steel slag through high-temperature reconstruction of calcium-aluminum components and application thereof
  • Method for preparing high-gelling-activity steel slag through high-temperature reconstruction of calcium-aluminum components and application thereof
  • Method for preparing high-gelling-activity steel slag through high-temperature reconstruction of calcium-aluminum components and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The raw material is composed of steel slag, lime and bauxite, and the mass percentage content of each component is as follows: steel slag 83%, calcium oxide 11%, bauxite 6%

[0031] (2) Dry the steel slag and calcium-aluminum quenched and tempered components at 110°C for 8 hours, crush them with a crusher to a particle size of <10mm, and grind them with a ball mill to a specific surface area of ​​400±20㎡ / Kg

[0032] (3) Put the steel slag prepared in step (2) into the mixer according to the ratio of step (1) for mixing, so that each component is evenly mixed, and the uniformly mixed material is made into a round cake test piece and placed in a resistor Calcination in furnace, calcination temperature 1350℃, holding time 90min, after the heat preservation is over, air cooling, and then grind the test block to a specific surface area of ​​400±20㎡ / Kg, to obtain the reconstituted steel slag of the calcium-aluminum component clinker.

Embodiment 2

[0034] (1) The raw material is composed of steel slag, lime and bauxite, and the mass percentage content of each component is as follows: steel slag 77%, calcium oxide 19%, bauxite 4%

[0035] (2) Dry the steel slag and calcium-aluminum quenched and tempered components at 110°C for 8 hours, crush them with a crusher to a particle size of <10mm, and grind them with a ball mill to a specific surface area of ​​400±20㎡ / Kg.

[0036] (3) Put the steel slag prepared in step (2) into the mixer according to the ratio of step (1) for mixing, so that each component is evenly mixed, and the uniformly mixed material is made into a round cake test piece and placed in a resistor Calcination in furnace, calcination temperature 1350℃, holding time 90min, after the heat preservation is over, air cooling, and then grind the test block to a specific surface area of ​​400±20㎡ / Kg, to obtain the reconstituted steel slag of the calcium-aluminum component clinker.

Embodiment 3

[0038] (1) The raw material is composed of steel slag, lime and bauxite, and the mass percentage content of each component is as follows: steel slag 74%, calcium oxide 24%, bauxite 2%

[0039] (2) Dry the steel slag and calcium-aluminum quenched and tempered components at 110°C for 8 hours, crush them with a crusher to a particle size of <10mm, and grind them with a ball mill to a specific surface area of ​​400±20㎡ / Kg.

[0040](3) Put the steel slag prepared in step (2) into the mixer according to the ratio of step (1) for mixing, so that each component is evenly mixed, and the uniformly mixed material is made into a round cake test piece and placed in a resistor Calcination in furnace, calcination temperature 1350℃, holding time 90min, after the heat preservation is over, air cooling, and then grind the test block to a specific surface area of ​​400±20㎡ / Kg, to obtain the reconstituted steel slag of the calcium-aluminum component clinker.

[0041] The ground steel slag was su...

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Abstract

The invention discloses steel slag reconstructed at a high temperature by utilizing calcium-aluminum components as well as a preparation method and an application thereof. The preparation method comprises the following steps: drying 74%-83% of steel slag, 11%-24% of a calcium hardening and tempering material (lime) and 2%-6% of an aluminum hardening and tempering material (bauxite), crushing, grinding, mixing, preparing a sample, calcining to obtain a calcined material, and grinding the calcined material to obtain the high-gelling-property steel slag clinker. The steel slag mineral compositionis reconstructed through calcium-aluminum components, so that low-activity minerals such as steel slag Fe2O3 and RO are converted into a high-gelling-activity mineral phase with dicalcium silicate (C2S) and aluminoferrite (C4AF) as main components. The change of the mineral phase enables the hydration activity of the steel slag to be improved, and research results show that the 28-day compressivestrength of the calcium-aluminum component reconstructed steel slag obtained by using the preparation method provided by the invention reaches 42.9 MPa, and the activity index reaches 91.3%. The obtained high-activity steel slag can be directly used as a cement admixture or a high-performance concrete admixture as a finished product, the comprehensive utilization rate of the steel slag is increased, and the method has practical significance.

Description

technical field [0001] The invention belongs to the technical field of green building materials, and in particular relates to a method and application of high-gelling active steel slag prepared by high-temperature reconstitution of calcium-aluminum components. Background technique [0002] Steel slag is a by-product of steelmaking, its output is about 15% to 20% of crude steel output, and its annual discharge is nearly 100 million tons. The resource utilization rate of steel slag in my country's current price segment is less than 30%. Improving the utilization rate of steel slag not only responds to the call of national policy, but also can reduce and prevent the secondary pollution and damage to the ecological environment caused by steel slag stacking in iron and steel enterprises. Due to the existence of inert minerals (RO phase) in steel slag, it seriously affects the gelling activity of steel slag, and some steel slags contain a certain amount of free calcium oxide (f-C...

Claims

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Application Information

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IPC IPC(8): C04B7/147C04B7/36C04B7/42
CPCC04B7/147C04B7/36C04B7/424Y02P40/10
Inventor 陈平向瑞衡李雁翎刘荣进龙顺红赵艳荣梁庆韦家崭王忠慰
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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