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A method for optimizing the performance of electric furnace white slag

A treatment method and white slag technology, applied in cement production and other directions, can solve the problems of no gelling activity, restricting the utilization of white slag, etc., so as to improve the gelling activity, improve the utilization rate of high value-added resources, and be beneficial to environmental protection Effect

Active Publication Date: 2016-01-20
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the main silicate mineral phase in white slag is dicalcium silicate, and the main γ-C 2 The existence of S crystal form has almost no gelling activity, which seriously restricts the use of white slag as an auxiliary material in cement concrete

Method used

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  • A method for optimizing the performance of electric furnace white slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Based on the original white slag, add component adjustment materials limestone (23.4% as CaO), bauxite (23.4% as Al 2 o 3 Calculated as 1.5%) and iron powder (as Fe 2 o 3 Calculated as 4.4%), mixed and ground together, calcined at 1350 ° C, and kept for 30 minutes; after the calcination was completed, it was cooled quickly by air cooling; then it was crushed with a jaw crusher, and ground with a ball mill until the The specific surface area is 350~450m 2 / kg.

[0019] According to w (reference cement): w (white slag) = 70%: 30% to prepare cementitious materials, according to (GB / T17671-1999) "cement mortar strength test method (ISO method)" to conduct mortar performance tests.

Embodiment 2

[0021] Based on the original white slag, add component adjustment materials limestone (calculated as CaO to 32.3%), bauxite (calculated as Al 2 o 3 Calculated as 1.5%) and iron powder (as Fe 2 o 3 Calculated as 4.4%), mixed and ground together, calcined at 1350 ° C, and kept for 30 minutes; after the calcination was completed, it was cooled quickly by air cooling; then it was crushed with a jaw crusher, and ground with a ball mill until the The specific surface area is 350~450m 2 / kg.

[0022] According to w (reference cement): w (white slag) = 70%: 30% to prepare cementitious materials, according to (GB / T17671-1999) "cement mortar strength test method (ISO method)" to conduct mortar performance tests.

Embodiment 3

[0024] Based on the original white slag, add component adjustment materials limestone (20% as CaO) and fluorite (calculated as CaF 2 Calculated as 1%), mixed and ground together, calcined at 1300°C, and kept for 2 hours; after the calcining was completed, it was cooled quickly by air cooling; then it was crushed with a jaw crusher, and ground with a ball mill until the The specific surface area is 350~450m 2 / kg.

[0025] According to w (reference cement): w (white slag) = 70%: 30% to prepare cementitious materials, according to (GB / T17671-1999) "cement mortar strength test method (ISO method)" to conduct mortar performance tests.

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Abstract

The invention relates to a method for optimizing the performance of electric furnace white slag. The process step is to firstly take a certain amount of electric furnace white slag, and add 20 to 35% of calcareous materials (calculated as CaO) to the electric furnace white slag according to weight percentage, 0-2% aluminum material (calculated as Al2O3), 0-5% iron material (calculated as Fe2O3) and 0-2% flux (calculated as CaF2), are mixed together and ground into fine powder, then The fine powder is calcined at high temperature to cause chemical reactions among the components. After the calcination is completed, it is rapidly cooled by air cooling, and then the above mixture is crushed and ground to obtain white slag with strong gelling activity. The mineral composition of the white slag is optimized, the gelling activity of the white slag is improved, the resource utilization rate of the white slag solid waste is improved, and it is beneficial to environmental protection.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of electric furnace white slag, and relates to a method for optimizing the performance of electric furnace white slag. Specifically, calcined materials, aluminum materials, iron materials and fluxes are mixed with white slag and then calcined. Make the chemical reaction between the various components, essentially optimize the mineral composition of the white slag, and improve the gelling activity of the white slag. Background technique [0002] Electric furnace white slag refers to the slag formed when carbon powder, ferrosilicon powder and other reducing agents are used for diffusion deoxidation during the reduction period of electric arc furnace steelmaking. It is in the form of white powder after cooling in air. With the development of our country's extra-furnace refining technology, the amount of white slag is increasing year by year. The accumulation of a large amount of whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/147C04B5/00
CPCY02P40/10
Inventor 贺图升赵旭光赵三银黎载波林云龙
Owner SHAOGUAN COLLEGE
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