Method for utilizing recovered high-silicon waste refining slag in low-silicon aluminum-containing steel
A refining slag and high-silicon technology, which is applied in the field of recycling high-silicon waste refining slag in low-silicon aluminum-containing steel, can solve the problems of poor fluidity of refining slag, difficulty in desulfurization, high cost of refining auxiliary materials, etc., and shorten the refining time , the total oxygen content is reduced, and the effect of improving the quality of the slab
Active Publication Date: 2018-01-16
RIZHAO STEEL HLDG GROUP
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[0006] In view of the above problems, the purpose of the present invention is to provide a method for recycling high-silicon waste refining slag in low-silicon and aluminum-containing steel, so as to solve the problems of poor fluidity of refining slag, difficulty in desulfurization, and high cost of refining auxiliary materials.
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[0020] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that these embodiments may be practiced without these specific details.
[0021] In view of the existing low-silicon and aluminum-containing steel refining process proposed above, the amount of lime used per ton of steel is 7-9kg, the amount of fluorite used is 1.8kg / t, and the amount of Al in slag 2 o 3 content of 15.26%, refining slag fluidity is poor, desulfurization is difficult, LF bottom blowing flow rate is large, stirring time is long, molten steel Si increases seriously after adding high silicon refining waste slag, which does not meet the requirements of steel types, and the cost of refining auxiliary materials is high. The present invention proposes A new recovery and reuse method of high-silicon waste refining slag in low-silicon and aluminum-containing steel. ...
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The invention provides a method for utilizing recovered high-silicon waste refining slag in low-silicon aluminum-containing steel. The method comprises the following steps: adding 5 to 8 kg / t of high-silicon waste refining slag, 1 to 3 kg / t of lime and 0.1 to 0.5 kg / t of fluorite before into-station operation of LF furnace refining; and controlling the dynamic conditions of ladles during LF furnace refining to be that bottom-blowing argon flow is 800 to 900 m<3> / h in the early stage of LF furnace refining, that the bottom-blowing argon flow is 150 to 200 m<3> / h in the power transmission stageof LF furnace refining, and that the bottom-blowing argon flow is 500 to 600 m<3> / h and stirring time is 40 to 50 S in the later stage of LF furnace refining, thereby inhibiting generation of Si. Themethod provided by the invention can overcome the problems of poor mobility and difficult desulfurization of refining slag, high cost of auxiliary refining materials, etc.
Description
technical field [0001] The invention relates to the technical field of steelmaking, and more specifically relates to a method for recycling high-silicon waste refining slag in low-silicon and aluminum-containing steel. Background technique [0002] CaO, Al in waste refining slag 2 o 3 The content is high, and recycling in the LF refining process can reduce the amount of refining slag and achieve rapid slag removal, which is of great significance for enterprises to improve quality and reduce costs. However, due to the high silicon dioxide content of high-silicon waste refining slag, it is recycled from low-silicon and aluminum-containing steel. In the LF refining process, SiO in waste slag 2 It is easy to react with Al in steel as follows: 3SiO 2 +4Al=3Si+2Al 2 o 3 . The occurrence of this reaction increases the Si content in the steel, and the Si content of low-silicon and aluminum-containing steel requires less than 0.05%, so that the Si content in the refining proces...
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IPC IPC(8): C21C7/076C21C7/072
CPCY02P10/20
Inventor 孙作迎蒲锐齐士兵米辉
Owner RIZHAO STEEL HLDG GROUP