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Blast furnace slag recycling method

A technology for blast furnace slag and charge, which is applied in the field of blast furnace slag iron recycling, can solve the problems of serious environmental pollution, low resource utilization rate, unsuitable for industrial promotion and application, etc., and achieves the effect of blast furnace utilization coefficient and improving drum strength.

Inactive Publication Date: 2013-10-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the blast furnace iron slag of vanadium-titanium magnetite is mainly directly smelted in the cupola after simple treatment. However, the resource utilization rate of the cupola smelting process is low, and the environmental pollution is serious, so it is not suitable for industrial application.

Method used

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  • Blast furnace slag recycling method

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Experimental program
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Effect test

Embodiment 1

[0035] This embodiment is used to illustrate the method for recycling blast furnace iron slag of the present invention.

[0036] Use a 2-ton heavy hammer to crush blast furnace slag iron (with a particle size of 1000-5000 mm) with an iron content of 20% by weight to less than 100 mm, and then sieve it with a 20 mm vibrating screen to obtain powder with a particle size of less than 20 mm and blocks with a particle size greater than 20 mm.

[0037] The powder is added to a ball mill (purchased from Shanghai Minggong Heavy Equipment Co., Ltd., model ) for ball milling for 8 minutes, and then use a magnetic separator to magnetically separate the milled powder to obtain magnetic powder and non-magnetic powder.

[0038] 52 parts by weight of vanadium-titanium iron ore concentrate, 27 parts by weight of ordinary iron ore concentrate, 52 parts by weight of coke powder, 15 parts by weight of quicklime and 1 part by weight of the magnetic powder are distributed on the magnetic roller ...

Embodiment 2

[0045] This embodiment is used to illustrate the method for recycling blast furnace iron slag of the present invention.

[0046] Use a 5-ton weight hammer to crush blast furnace slag iron (with a particle size of 1000-5000 mm) with an iron content of 40% by weight to less than 100 mm, and then sieve it with a 20 mm vibrating screen to obtain powder with a particle size of less than 20 mm and blocks with a particle size greater than 20 mm.

[0047] The powder is added to a ball mill (purchased from Shanghai Minggong Heavy Equipment Co., Ltd., model ) for 10 minutes, and then use a magnetic separator to magnetically separate the milled powder to obtain magnetic powder and non-magnetic powder.

[0048] 51 parts by weight of vanadium-titanium iron ore concentrate, 27 parts by weight of ordinary iron ore concentrate, 52 parts by weight of coke powder, 15 parts by weight of quicklime and 2 parts by weight of the magnetic powder are distributed on the magnetic roller distributor a...

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Abstract

The invention relates to a blast furnace slag recycling method. The blast furnace slag recycling method comprises the following steps of: (1) crushing blast furnace slag to the particle size of below 100mm, and sieving the crushed blast furnace slag to obtain powder with the particle size of less than 20mm and lump materials with the particle size of greater than 20mm; and (2) sequentially grinding and magnetically separating the powder to obtain magnetic powder and non-magnetic powder, wherein the magnetic powder is used as a part of sintering raw material to be sintered, and the lump materials are used as a part of furnace charge to be smelted in a blast furnace. The blast furnace slag recycling method can be used for effectively recycling the blast furnace slag and is particularly suitable for recycling the blast furnace slag with relatively high iron content.

Description

technical field [0001] The invention relates to a recycling method of blast furnace iron slag. Background technique [0002] The titanium content in the vanadium-titanium magnetite is high, so that the TiO in the slag 2 content is higher, while TiO 2 The over-reduction of titanium will generate low-valent titanium (such as TiC, TiN and TiCN). These low-valent titanium are adsorbed on the small iron beads, which increases the surface tension of the small iron beads, making it difficult to aggregate and grow, resulting in a large number of dispersed small iron beads in the slag. Moreover, the higher the low-valent titanium content in the slag, the more corresponding high-melting point minerals, resulting in an increase in the melting temperature of the slag, an increase in the viscosity of the slag, and difficulty in separating slag and iron. In addition, during the blast furnace smelting process of vanadium-titanium magnetite, a large amount of iron slag will be produced i...

Claims

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Application Information

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IPC IPC(8): C21B3/04
CPCY02P10/20Y02W30/50
Inventor 付卫国谢洪恩蒋胜张海军黄云
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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