Abstract
Direct alloying with molybdenum oxides has been regarded in years; the main addition methods are adding to the bottom of electric arc furnace (EAF) with scrap, adding to the ladle during the converter tapping and mixing molybdenum oxide, lime and reductant to prepare pellet added to basic oxygen furnace (BOF). In this paper, a new method for direct alloying with molybdenum trioxide is proposed, adding molybdenum trioxide molten steel by feeding wire method in ladle furnace (LF) refining process. The feasibility of molybdenum oxide reduction, the influence rules of bottom-blown on liquid steel fluidity and the yield of molybdenum by feeding wire method were analyzed. Results show that molybdenum oxide can be reduced by [Al], [Si], [C], and even [Fe] in molten steel. Bottom blowing position has a significant influence on the flow of molten steel when the permeable brick is located in 1/2 radius. The yields of Mo are higher than 97% for the experiments with feed wire method, the implementation of direct alloying with molybdenum trioxide by feed wire method works even better than that uses of ferromolybdenum in the traditional process.
Highlights
Direct alloying with oxide in steelmaking process is a new alloying method relative to traditional process; oxide minerals added to smelting furnace react with reductants in molten steel, the metal elements are as reduction product dissolved in molten steel [1,2,3]
Direct alloying with molybdenum oxides has been regarded in years; the main addition methods are adding to the bottom of electric arc furnace (EAF) with scrap, adding to the ladle during the converter tapping and mixing molybdenum oxide, lime and reductant to prepare pellet added to basic oxygen furnace (BOF)
Bottom blowing position has a significant influence on the flow of molten steel when the permeable brick is located in 1/2 radius
Summary
Direct alloying with oxide in steelmaking process is a new alloying method relative to traditional process; oxide minerals added to smelting furnace react with reductants in molten steel, the metal elements are as reduction product dissolved in molten steel [1,2,3]. Many researchers have investigated direct alloying with molybdenum oxide in steelmaking – the central research focuses on volatilization of molybdenum trioxide and adding method. The melting process of direct alloying was studied, and the primary addition method is as follows, adding to the bottom of EAF with scrap, adding to the ladle during the converter tapping, molybdenum oxide, lime, and reductant are mixed to prepare pellet added to BOF [1012]. Based on previous researches and practical experiences, a new method for direct alloying with molybdenum trioxide is proposed in this paper; molybdenum trioxide can be added to molten steel by feeding wire method in LF refining process
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