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A kind of recycling technology of lf furnace refining slag

A refining slag and process technology, which is applied in the field of LF furnace refining slag recycling technology, can solve problems such as complex procedures and achieve the effect of reducing production costs

Active Publication Date: 2015-10-07
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent effect is better, but the process is more complicated
At present, there is no report about using LF slag as binder to prepare cold solidified pellets.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The cold-pressed pellet mixture consists of the following ingredients by weight percentage:

[0013] LF slag 10%, converter mud 30%; gas ash 30%; blast furnace pit ash 30%, of which the moisture content of the mixture is 14%.

[0014] The preparation method of the above-mentioned cold-pressed pellets is to first mix the mixture in a mixer for 20 minutes, mix evenly, press and form it under a pressure of 150 tons through a cold-press molding machine, and measure its compressive strength after placing it for 25 days to be 2600N. 1 meter high free drop test is 22 times.

Embodiment 2

[0016] The cold-pressed pellet mixture consists of the following ingredients by weight percentage:

[0017] 15% LF slag, 25% converter dust; 35% gas mud; 25% blast furnace slag, of which the moisture content of the mixture is 15%.

[0018] The preparation method of the above-mentioned cold-pressed pellets is to first mix the mixture in a mixer for 25 minutes, mix evenly, press and form it under a pressure of 180 tons through a cold-press molding machine, and measure its compressive strength after 27 days to be 2800N. The free drop test from a height of 1 meter is 25 times.

Embodiment 3

[0020] The cold-pressed pellet mixture consists of the following ingredients by weight percentage:

[0021] LF slag 20%, converter mud 27%; gas mud 31%; blast furnace slag 22%, of which the moisture content of the mixture is 17%.

[0022] The preparation method of the above-mentioned cold-pressed pellets is to first mix the mixture in a mixer for 20 minutes, mix evenly, press and form it under a pressure of 200 tons through a cold-press molding machine, and measure its compressive strength after 28 days to be 3000N. The free drop test from a height of 1 meter is 28 times.

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Abstract

The invention discloses a recycling process for low-frequency (LF) furnace refining slag. The process is characterized in that the process comprises the following steps of: mixing LF furnace slag with the weight percentage of 10-30 percent with iron-containing waste materials with the weight percentage of 70-90 percent; controlling moisture content of the mixed material to be 13-18 percent; putting the mixed material into a mixing mill for mixing and milling according to the proportion for 20-30 minutes to uniformly mix; compacting and forming the mixture by a cold press forming machine; and naturally placing for 25-30 days to form metallurgy cold-pressed pellets. The process has the effects that for the pellets prepared by the method, the compression strength of a single pellet can reach over 2500N, a one-meter free drop test can be performed more than twenty times to completely meet a requirement of the strength of the metallurgy cold-pressed pellets, and the pellets can be applied to blast furnaces or converters. The process provides a new path for recycling LF furnace refining slag. A binder is not needed to add, the LF furnace refining slag is used, and the high-strength pellets are compressed, so that a direction for the recycling metallurgy iron-containing waste materials is provided, and the production cost of the cold-pressed pellets is reduced.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of refining slag, and relates to a recycling process of LF furnace refining slag. Background technique [0002] In the metallurgical industry, it is very important to implement an environmentally friendly circular economy, comprehensively utilize iron-containing dust and sludge waste generated in the process of smelting and rolling steel, and produce cold-pressed pellets for blast furnaces or converters. In addition, steel mills use different refining methods to improve the quality of molten steel in the secondary refining process of molten steel, among which LF furnace produces a large amount of residue after refining. At present, the main treatment method is: transporting the residue from the steel mill to the waste dump, which not only takes up space, costs a lot of freight, increases the production cost of the steel mill, but also pollutes the environment. Making full use of these ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C21B3/04
CPCY02W30/54Y02W30/542Y02P10/20Y02W30/50
Inventor 于淑娟张大奎王向锋王俊山侯洪宇耿继双徐鹏飞袁玲
Owner ANGANG STEEL CO LTD
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