Method for cracking and granulating steel slag

A granulation and steel slag technology, applied in the field of iron and steel metallurgy, can solve the problems of high energy consumption of multi-stage crushing, large investment in equipment and large water consumption, and achieve the effect of high practical value, reduced production cost and low cost.

Active Publication Date: 2015-05-27
马鞍山市华东冶金科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the existing steel slag granulation mode: 1) multi-stage crushing has high energy consumption, low processing efficiency, and general granulation effect; 2) large consumption of water resources, large investment in equipment capital, and serious environmental pollution The problem is to provide a steel slag cracking and granulation method; using the steel slag granulation technology of the present invention, the steel slag can be effectively cracked and granulated, and the granulated steel slag has a uniform particle size and a suitable size, which is easy to process and utilize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A steel slag cracking and granulation method in this embodiment, selects limestone with a particle size of less than 60mm and performs drying and mixing, uses the final slag of a converter in a steelmaking plant, and the slag is discharged from the converter at 1600°C (steel slag has strong fluidity at this temperature), and the After mixing and drying, the limestone and liquid steel slag are hedged, and at the same time, the ratio of the feeding rate of limestone to liquid steel slag is controlled to be equal to the mass ratio of limestone to liquid steel slag and poured into the slag bag. Mixing with steel slag evenly provides an important guarantee for obtaining granulated steel slag with uniform particle size and appropriate size. The ratio of the feeding rate of limestone to liquid steel slag is controlled to be equal to the mass ratio of limestone to liquid steel slag. Maintaining this feeding rate can not only make full use of the heat of liquid steel slag, but al...

Embodiment 2

[0031] A kind of steel slag pyrolysis granulation method of the present embodiment, selects the dolomite 160g that particle size is less than 60mm and carries out drying and mixing, weighs 3000g of the final converter slag of a certain steelmaking plant, first puts this 3000g steel slag in the graphite crucible preheating, Put it into a muffle furnace with a furnace temperature of 1600°C and melt it. After the steel slag is completely melted, mix it with dolomite in another preheated crucible, and finally air-cool the mixture to 600°C. Perform crushing and screening.

Embodiment 3

[0033] A kind of steel slag cracking and granulation method of the present embodiment, selects 80kg of limestone with particle size less than 60mm and carries out drying and mixing, weighs 450kg of refining slag of LF furnace of a factory, first puts 450kg of steel slag in graphite crucible for preheating, and then puts Melt in an intermediate frequency induction furnace with a furnace temperature of 1600°C. After the steel slag is completely melted, add it to the preheated slag bag together with the mixed and dried limestone and mix evenly. Finally, air-cool the mixture to 600°C and mix it evenly. The material is crushed and screened.

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Abstract

The invention discloses a method for cracking and granulating steel slag, belonging to the technical field of ferrous metallurgy. According to the invention, a cracking agent is mixed with liquid steel slag; the cracking agent is a carbonate mineral, the granularity of which is less than 60 mm; the carbonate mineral is one or more selected from a group including dolomite, limestone, magnesite and siderite; the carbonate mineral is heated and decomposed to generate CO2; CO2 can generate air holes in the steel slag; therefore, after being solidified, the steel slag is changed from an original continuous tissue to a porous discontinuous tissue; and the solidified steel slag having the tissue structure can be cracked and granulated very easily under the action of force. By utilizing the steel slag granulating technology disclosed by the invention, the steel slag can be effectively cracked and granulated; and the granulated steel slag is uniform in granularity, proper in size and easy to process and utilize.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically relates to a method for cracking and granulating steel slag. Background technique [0002] Steel slag, as the waste slag of steelmaking, generally accounts for about 15% of crude steel output. In recent years, with the rapid development of my country's iron and steel industry, the accumulation of steel slag has increased year by year, which not only occupies a large amount of land, but also causes serious environmental pollution. With the continuous key breakthroughs in the comprehensive utilization of steel slag resources, the comprehensive utilization of steel slag resources is getting higher and higher. At present, the utilization methods of steel slag mainly include water quenching method, air quenching method, drum method, hot pouring method, granulation wheel method, hot stuffing method and so on. The common purpose of the above treatment processes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06
CPCC21B3/06Y02W30/50
Inventor 范鼎东
Owner 马鞍山市华东冶金科技发展有限公司
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