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Molten steel casting residue treatment and recycling method

A casting slag recycling technology, applied in the field of metallurgy, can solve problems such as the inability to realize the comprehensive utilization of casting slag recycling, achieve uniform and stable product particle size, better grinding effect, and promote the effect of expansion and pulverization

Active Publication Date: 2014-12-17
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods can recover metal materials in casting slag, they cannot realize comprehensive utilization of casting slag resources

Method used

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  • Molten steel casting residue treatment and recycling method

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Experimental program
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Effect test

Embodiment approach

[0026] The water spraying described in step A is spraying atomized cooling water, the spray surface covers the mouth of the casting residue tank, and the water spraying time is 1 hour.

[0027] The size of the grid sieve described in step B is 100-200 mm×100-200 mm, preferably 150 mm×150 mm.

[0028] The casting slag described in the step B includes the casting slag and hot stuffy steel slag digested by the water spraying method, and the hot stuffy steel slag is the converter solid or molten steel slag with a temperature of 300-1600°C is tipped into the hot stuffy pool, Mechanical agitation and manual pumping of water make it primary crushed and soaked to wake up the slag, then cover the hot stuffy cover for intermittent water and stuffy slag pumping operation, make full use of the waste heat of steel slag to generate water vapor, and promote f-CaO and f- in steel slag MgO is decomposed and powdered by volume expansion, which is convenient for subsequent processing. The two k...

Embodiment 1

[0051] Water spraying method to treat casting residue: the water supply system sprays atomized cooling water at a water supply rate of 210L / min to the mouth of the casting residue tank through the atomizing nozzle, and the spray surface covers the entire tank mouth. Sprinkle water for the first time until water overflows from the mouth of the tank, and stop watering; after an interval of 1 hour, water again until water overflows from the mouth of the tank, and stop watering. Repeatedly pouring water in this way until no steam emerges from the mouth of the tank, stop watering, and leave the casting slag tank to stand and age until the surface temperature is less than 70°C to complete the treatment of casting slag.

Embodiment 2

[0053] Sprinkling water method to treat casting residue: the water supply system sprays cooling water at a rate of 210L / min to the mouth of the casting residue tank through an ordinary sprinkler (shower), and the entire tank mouth should be covered when spraying water. Spray water for the first time until water overflows from the mouth of the tank, and stop watering; after an interval of 0.5 hours, water again until water overflows from the mouth of the tank, and stop watering. Repeat this until no steam emerges from the mouth of the tank, stop watering, and leave the casting slag tank to age until the surface temperature is less than 70°C to complete the treatment of casting slag.

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Abstract

The invention discloses a molten steel casting residue treatment and recycling method which comprises the circular treatment steps of slaking, screening, magnetic separation and the like. The f-CaO in casting residue is slaked by vapor to accelerate the expansion and efflorescence of the casting residue, thereby solving the problem on the separation of the casting residue from a tank body and reducing dust nuisance. According to the method, a mixture of water spray casting residue and pyrolytic steel slag is used as the raw material, and the pyrolytic steel slag has the advantage of low f-CaO content, thereby ensuring that the f-CaO content of the final product can meet the requirements of cement and construction material industries; and a rod grinder treatment process is used, thereby achieving favorable grinding effect and ensuring that the product is uniform and stable in particle size. For the product disclosed by the invention, slag steel of which the grade is greater than 80% can be returned for steel making; purified steel shots and magnetic separation powder of which the grade is greater than 42% can be used for a sintering procedure; and steel tailings of which the iron content is smaller than 2% and the f-CaO content is smaller than 3% can be used for producing steel slag powder, steel slag cement, construction material products and road materials. The invention maximally recycles the metal material in the casting residue, realizes the zero discharge of industrial solid waste and ensures that the casting residue can be recycled 100% at a high added value.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for comprehensive utilization of steelmaking slag, in particular to a method for processing and resource utilization of molten steel casting slag. Background technique [0002] Casting slag is the mixture of molten steel and steel slag remaining in the ladle after continuous casting of molten steel, and its composition is roughly the same as that of converter slag. Its main mineral composition is tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), rhodonite (C 3 MS 2 ), olivine (CMS), RO phase and NaCaSmitite (C 7 P.S. 2 ) after each furnace of molten steel is poured, the remaining casting slag will be poured into the slag tank, and will condense quickly; each slag tank can hold about several furnaces to dozens of furnaces of casting residue The poured casting slag eventually becomes a layered large slag steel mound, which is also firmly bonded ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C04B5/00B03B9/04B03C1/02B07B1/00
CPCY02P10/20Y02W30/50
Inventor 方丽华孙小跃何建松段江涛董瑞章王志雄张海涛张进国贺压柱郑楠吴永红
Owner WUKUN STEEL
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