Ladle furnace refining fluoride-free pre-melted slags, preparation method and using method

Abstract

The invention belongs to the field of the steel-making secondary refining ladle metallurgy, particularly relates to ladle furnace refining fluoride-free pre-melted slags, a preparation method and a using method and is suitable for the slagging refining process of the steel-making secondary refining in a steel ladle. The invention aims to provide the ladle furnace refining fluoride-free pre-melted slags, the preparation method and the using method by utilizing existing spodumene resources and adding a refining flux and a slag regulation component, solve the problems of defects of slag desulfurization, low dephosphorizing efficiency, large difficulty in rephosphorization control, poor slag melting performance, poor slag inclusion adsorption performance and the like of current ladle refining slagging materials, also reduce the ladle secondary refining slagging cost and implement the low-cost processing and utilization of a spodumene mineral. The ladle furnace refining fluoride-free pre-melted slags are characterized by being prepared from the following raw materials in percentage by weight: 40 to 60 percent of spodumene powder, 30 to 50 percent of lime powder and 5 to 25 percent of aluminium ash powder.

Description

technical field [0001] The invention belongs to the field of ladle metallurgy for refining outside a steelmaking furnace, in particular to a fluorine-free pre-melted slag for refining in a ladle furnace, a preparation method and a use method, which are suitable for the slagging refining process in the ladle for secondary refining of steelmaking. Background technique [0002] With the development of social economy, users have put forward higher and higher requirements for the quality of steel products. As an important production process in the modern steelmaking process, extra-furnace refining plays a pivotal role in the entire steel production process. In the refining process, synthetic slag refining has the functions of desulfurization, dephosphorization, deoxidation and absorption of inclusions in steel, etc., and has been widely used and developed. [0003] At present, the refining slag outside the steelmaking furnace mainly includes the following basic series: CaO-CaF 2...

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Problems solved by technology

[0009] The purpose of the present invention is to use the existing spodumene resources, by adding refining flux and slag adjustment components, to provide a ladle furnace refining fluorine-free pre-melting slag and its preparation method and use method, so as to solve the problem of current ladle refining slag The existing problems of slag desulfurization and dephosphorization efficiency are not high, phosphorus return control is difficult, slag melting performance, and inclusion absorption performance are insufficient. At the same time, it reduces the cost of secondary refining slagging of ladles and realizes the low cost of spodumene minerals processing and utilization

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