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Process for treating steel slag

A treatment method and technology for steel slag, applied in the direction of recycling technology, improvement of process efficiency, etc., can solve the problems of low added value and affect the quality of steel, and achieve the effects of low cost, solving environmental pollution, and simple process equipment

Inactive Publication Date: 2003-01-15
北京科美隆科技发展有限公司
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Problems solved by technology

The produced slag steel with a particle size of 30-300mm contains only 30-60% iron, which can only be used for recycling iron-making raw materials. Except for a small amount of metallic iron, most of them can only be used for road paving or ordinary building materials , steel slag powder with a particle size of 0-10mm, the content of Fe is about 17%, but the content of CaO is relatively high, up to 40%. It is recycled, and the content of phosphorus increases year by year, which affects the quality of steel. It has been discontinued and stored in large quantities.
[0004] To sum up, in the prior art, steel slags with a relatively good iron content of 30% to 60% can be used as raw materials for ironmaking, and the rest can only be used as road paving and building materials, with low added value.

Method used

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Embodiment Construction

[0044] Three batches of steel slag and one batch of steel slag are processed by adopting the steel slag processing method described in the present invention. The raw materials of batch numbers 1, 2, and 3 are steel slag, and the raw materials of batch number 4 are steel slag.

[0045] The particle size and iron content of the four batches of raw materials are shown in Table 1.

[0046] Batch numbers 1, 2, and 3 whose raw material is slag steel enter the air-swept mill 5 for grinding. Negative pressure operation is used during the grinding process. The air pressure and air flow are also listed in Table 1. After grinding, they are not sucked away by the negative pressure. The settled steel slag is a high-quality steel scrap with an iron content greater than 90% that can be used for steelmaking, and its particle size and iron content are also listed in Table 1. After grinding, the slag steel powder with a particle size of 0-1mm is sucked away by negative pressure and enters the ...

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Abstract

A process for reclaiming the steel slags includes such steps as preparing steel slags and residual steel as raw material, sieving, ball grinding, magnetic separating, and wind classifying to obtain 4 products: high-quality waste steel used for smelting steel, refined iron powder used for smelting iron, micro slag powder used as high-activity additive of concrete, and steel slag aggregate used for slag-asphalt-concrte pavement of highway.

Description

technical field [0001] The invention belongs to the field of separating solid materials from solid materials, and mainly relates to the separation treatment of steel-making steel slag, in particular to the deep processing of primary slag steel and steel slag. Background technique [0002] Steel slag is an inevitable product of steelmaking, and the steel slag produced in my country reaches as much as 15 million tons every year. Therefore, the effective treatment and comprehensive utilization of steel slag has always been a concern of people, and many manufacturers at home and abroad have carried out research and development on the comprehensive utilization of steel slag. But it is still in the stage of simple, low-quality, low-value-added crushing and screening of primary products. The selected steel slag has a low iron content of 30-60%, and can only be used as raw material for ironmaking, and the remaining steel slag can only be used for ironmaking sintering ingredients, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/00C21B3/06
CPCY02P10/20Y02W30/50
Inventor 刘金生
Owner 北京科美隆科技发展有限公司
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