Blowing powder for molten steel secondary refining and preparation method and methods for using same

A technology for external refining and molten steel furnace, which is applied in the field of injection powder for external refining of molten steel and its preparation and application. It can solve the problems of insufficient matching of smelting time and affect the production efficiency of steelmaking process, etc., and achieve shortening of operation time and improvement of operation. Efficiency, the effect of reducing production costs
CN100547086CInactive Publication Date: 2009-10-07INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
Publication Date
2009-10-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for molten steel secondary refining by means of blowing powder is characterized in that the blowing powder is formed through mixing passivated calcium aluminate powder and calcium metal powder according to a certain proportion; the mass percent of the chemical composition of the powder is as follows: Ca is more than or equal to 1 and is less than or equal to 48, while calcium aluminate is more than or equal to 52 and is less than or equal to 99; moreover, both the particle sizes of the calcium metal powder and the calcium aluminate powder are less than or equal to 1.5 mm. During blowing, single blowing of calcium aluminate powder, or mixing blowing of mixed calcium metal powder and calcium aluminate powder, or compound blowing process of calcium metal and calcium aluminate can be adopted. The method can replace LF furnace process in molten steel secondary refining; moreover, the method substantially saves secondary refining time, increases utilization rate of calcium metal and obtains ideal refining effect.
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Description

technical field

[0001] The invention relates to a method for refining molten steel outside a furnace by using injection powder, the required powder and its preparation. Background technique

[0002] At present, in steelmaking production, most enterprises adopt the technological process of molten iron pretreatment-converter (or electric furnace) smelting-out-of-furnace refining-continuous billet casting. The out-of-furnace refining methods in the process include LF, VD, RH plus argon blowing and stirring There are several ways, among which the LF furnace process was used earlier and more widely. The main purpose of using LF furnace for out-of-furnace refining is to increase the temperature of molten steel and slagging and refining to remove inclusions in molten steel, including further desulfurization and deoxidation of molten steel. However, with the shortening of the converter smelting time and the substantial increase of the billet casting speed in the continuous billet c...

Claims

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