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Modified LF furnace refining waste residue with high gelling activity as well as preparation method and application thereof

A technology for refining waste residue and modification, applied in cement production and other directions, can solve the problems of low activity and inferior crystal form, and achieve the effects of high economic benefit, improved hydration activity and gelation, and is conducive to popularization and application.

Active Publication Date: 2020-09-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low activity and volume stability caused by the dense ore phase structure, few defects and poor crystal form when LF furnace refining slag is used as cement-based (auxiliary) cementitious material

Method used

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  • Modified LF furnace refining waste residue with high gelling activity as well as preparation method and application thereof
  • Modified LF furnace refining waste residue with high gelling activity as well as preparation method and application thereof
  • Modified LF furnace refining waste residue with high gelling activity as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, add 0.5% B to the high-temperature molten liquid LF furnace refining slag 2 o 3 stabilizer, and apply 100KHZ ultrasonic waves; then, the liquid refining slag flows out through the discharge hole at the bottom of the crucible, and high-speed gas is used to crush the liquid slag during the outflow of the slag liquid, so that it forms liquid slag droplets and rapidly cools in flight. And fall into the rotating cooling cylinder (the cylinder body has an inclination angle of 10° with the horizontal plane), and carry out secondary rapid cooling through negative pressure gas in the cylinder and spray cooling water outside the cylinder; then, the refined slag of the LF furnace after secondary cooling The discharge from the end of the cylinder falls into the 300r / min fast rotating disc to make it further cooled; finally, the cooled modified LF furnace refining slag is collected.

Embodiment 2

[0045] First, add 0.5% B to the high-temperature molten liquid LF furnace refining slag 2 o 3 stabilizer, and apply 150KHZ ultrasonic waves; then, the liquid refining slag flows out through the discharge hole at the bottom of the crucible, and high-speed gas is used to crush the liquid slag during the outflow of the slag liquid, so that it forms liquid slag droplets and rapidly cools in flight. And fall into the rotating cooling cylinder (the cylinder body has an inclination angle of 10° with the horizontal plane), and carry out secondary rapid cooling through negative pressure gas in the cylinder and spray cooling water outside the cylinder; then, the refined slag of the LF furnace after secondary cooling The discharge from the end of the cylinder falls into the 700r / min fast rotating disc to make it further cooled; finally, the cooled modified LF furnace refining slag is collected.

[0046] The performance test of the modified LF furnace refining waste slag prepared by the ...

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Abstract

The invention discloses a modified LF furnace refining waste residue with high gelling activity, a preparation method and application, wherein the modified LF furnace refining waste residue is mainlycomposed of amorphous C12A7 mineral and beta-C2S mineral and the content reaches 60% or above, and the modified LF furnace refining waste residue also contains a small amount of C3A, C3S, CaO, MgO, CaF2 and other minerals. The invention also provides a preparation method of the modified LF furnace refining waste residue with high gelling activity and application of the modified LF furnace refiningwaste residue as a cement-based material and a quick-hardening gelling material. The invention discloses modified LF furnace refining waste slag with high gelling activity, which is an effective wayfor optimizing and modifying waste slag generated in steel refining slag and recycling building materials of the waste slag. The early-strength quick-hardening cement has the characteristics of high hydration activity, early strength and quick hardening, is wide in source and low in cost, has huge potential of being used as a cementing material or an auxiliary cementing material to be applied to cement-based building materials and special engineering materials, and is wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of resource utilization of metallurgical waste slag, and more specifically relates to a modified LF furnace refining waste slag with high gelling activity and its preparation method and application. Background technique [0002] As my country's steel is accelerating into the depreciation era and my country's huge demand for special steel / high-quality steel, the demand for scrap steel and crude steel refining is increasing rapidly year by year, and a large amount of refining waste slag will also be produced in the steel refining process, of which The ladle arc refining furnace (LF furnace for short) mainly produces waste slag during the refining process of scrap steel or crude steel (LF furnace refining slag for short). According to statistics, for every 1t of molten steel refined, 20-50kg of LF furnace refining slag needs to be discharged. In 2017, my country's scrap steel depreciation and crude steel produc...

Claims

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Application Information

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IPC IPC(8): C04B5/06C04B7/147C21B3/08
CPCC04B5/06C04B7/147C21B3/08C21B2400/024C21B2400/026C21B2400/058Y02P40/10
Inventor 赵计辉王奕仁程子睿
Owner SUN YAT SEN UNIV
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