Novel method for modification of KR desulfuration residue

Abstract

The invention provides a novel method for modification of KR desulfuration residue. Taken a 11 slag ladle of converter slag as an example, the method comprises the steps of swinging and overturning by a travelling crane; first, adding KR desulfuration residue to the slag ladle, wherein 2.0-2.8 tons of desulfuration residue is added into each ladle; then, adding 8-14 tons of liquid slag to a converter; carrying out redox reaction on slag in the slag ladle, wherein the property of the KR residue is converted from reducibility to oxidability, that is, mineral composition in the residue is modified; the KR desulfuration residue is generated by adding a desulfurizer in molten iron which is mechanically agitated, and liquid slag is a byproduct obtained in the process of converter steelmaking. The slag ladle selected is made of 16MnA steel casting.

Description

technical field [0001] The invention relates to the treatment of molten iron desulfurization slag, which combines converter liquid steel slag with KR steel slag for upgrading treatment, and realizes the optimization and utilization of steel slag. Background technique [0002] Desulfurization of hot metal by KR method, that is, desulfurization by mechanical stirring, is to insert a stirrer made of refractory material into a certain depth under the liquid level of the molten iron tank and make it rotate. When the stirrer rotates, the liquid level of the molten iron forms a "V" shape. Vortex (low in the center and high around), when the desulfurizer is added, the desulfurizer particles are dispersed due to turbulence in the end area of ​​the blade, and "spit out" along the radial direction, then suspend, rotate around the axis and float up In the molten iron, that is to say, the desulfurizer is involved in the molten iron and contacted with the mechanical agitation, mixed and s...

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Problems solved by technology

[0003] Literature search disclosure: (1) Zhang Chengyong, Chen Shouhong, etc. "Application of Bottom Blowing Nitrogen Process in KR Process for Hot Metal Desulfurization" was published in "Steelmaking" in 2010 (3); (2) Li Fengxi, Yu Chenghuan, etc. "Review of KR Process Discussion on Two Desulfurization Processes of Hot Metal and Injection Method" was published in "Steelmaking" in 2000 (1); (3) Zhang Maolin and Xu Anjun's "Comparison of the Application of 2KR Method and Injection Method in Hot Metal Desulfurization" was published in "Steelmaking "Published on May 5, 2009; it can be seen that the desulfurization slag produced by the KR desulfurization process is a kind of reduction slag, and it is easy to pulverize as the temperature of the slag decreases. The pollution is very serious, and there is no good recycling method at present, resulting in the accumulation of desulfurization slag in many steel factories, which has become a kind of dust hazard in steel enterprises

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