OPportunities for obtaining of deoxidizing and alloying alloy by metallurgical utilization of vanadium waste
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2017-01-01
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Abstract
For the contemporary steel production, deoxidizing and desulfurizing alloys produced via ferroalloys metallurgy are required. Such kind of alloys is silicocalcium. When its production is accompanied by additives containing alloying elements, the alloy obtained has alloying properties at its import in a certain steel grade. Using of a few hundredths of the alloying elements (such as vanadium, niobium, etc.) to the steel quantity increases significantly its strength indexes. The most common minefields of vanadium contain about 1% vanadium in the form of complex compounds with various elements. This makes uneffective their direct utilization in the ferrous metallurgy. There are corporate organizations that are manufacturing products from vanadium-containing raw materials. One of these products is vanadium catalyst - material that is distributed in factories for production of sulfuric acid. After a certain period of use it is deactivated and deposited and it contains significantly higher amounts of natural vanadium. It contains over 60 % SiO2. Catalyst utilization in a combination with calcium-containing materials via pyrometallurgical method is an optimal opportunity for both environmental protection and preparation of precious metallurgical alloys as silicocalcium. Currently in Bulgaria imported and expensive silicocalcium is being used. The paper presents the results of laboratory calculations using three methods for silicocalcium production with increased vanadium content.