Steel slag multi-stage treatment method

A treatment method and steel slag technology, applied in grain treatment, chemical instruments and methods, solid separation, etc., can solve the problems of comprehensive utilization of steel slag that have not yet been realized, and achieve the effect of improving the value of comprehensive utilization

Active Publication Date: 2019-04-09
南京芬钢环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method only focuses on selecting granular iron powder with an iron grade of more than 60% from the powder, and has not yet realized the comprehensive utilization of steel slag.

Method used

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  • Steel slag multi-stage treatment method

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Experimental program
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Effect test

Embodiment

[0034] The flow process of the steel slag multistage treatment method of the present embodiment is as follows figure 1 , including the following steps:

[0035] (1) The hot and stuffy steel slag is discharged, loaded into the contractor's dump truck, transported to the steel slag factory material shed for transfer, and enters the vibrating feeding bin through the feeding platform.

[0036] (2) Vibrating feeding into the hopper, the diameter range of the feeding is 0-800mm; the steel slag raw material transfer station with a diameter of more than 800mm has a separate environmental protection dust removal pretreatment area, which is cut to less than 300mm by oxygen and then processed online.

[0037] (3) Steel slag is divided into >300mm and 0~300mm two types by pre-selection drum screen. After sorting those larger than 300mm, part of them will be returned to the cutting area for cutting.

[0038] (4) The 0-300mm steel slag is directly sent to the jaw crusher, and after crushi...

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Abstract

The invention provides a steel slag multistage treatment method. The method comprises crushing steel slag circulation, screening and magnetic separation, so as to finally obtain iron powder with the TFe content greater than 60% and tailings with the MFe content being less than 1%. The tailing powders can be used as a roadbed cushion layer, a water-stable layer instead of gravel aggregate, and isused as a raw material of commercial concrete and mortar; or be used as an auxiliary material to prepare pellets and be used as a mixture steel scrap pressing block. The method has the advantages thatthe metal recovery rate is 99% or above, and zero emission is really realized.

Description

technical field [0001] The invention relates to a method flow for comprehensive utilization of steelmaking waste, in particular to a multi-stage treatment method for steel slag. Background technique [0002] Steel slag is the main solid waste in the steelmaking process. Based on the national steel production capacity of 800 million tons, 120 million tons of steelmaking steel slag is currently produced. However, domestic steel slag treatment methods are simple and extensive; usually after hot stuffing, cooling, and decomposition, large-diameter steel scrap and magnetic separation powder are sorted out; the remaining tailings are more than 20mm, accounting for more than 80% of the total treatment. Because it is not fully broken, it still contains about 4% elemental iron, and the content of more people even exceeds 5%. Moreover, the remaining tailings have serious problems of slag-coated iron and slag-iron solidification; due to the limitation of domestic technical level, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00B02C21/00B03C1/30
CPCB02C21/00B03C1/30B09B3/00B09B5/00
Inventor 王严
Owner 南京芬钢环保科技有限公司
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