Utilization of dispersed waste of ferroalloy production on the basis of metallurgical SHS-process

Abstract

A review of methods for processing dispersed waste from f loy production was performed. In ferroalloy plants there is a problem of formation and accumulation of cyclone dust (the catch product from crushing – CPC), formed during the grinding and fractionation of ferroalloys. The drawbacks of the known methods for the disposal of such dust are shown. The authors have investigated the possibility of obtaining commercial nitrided ligatures from CPC’s and substandard ferroalloy fines using the technology of self-propagating high-temperature synthesis (SHS). On the basis of the proposed “metallurgical” SHS method, a technology has been developed and the possibility of largescale production of nitrided ferrosilicon, ferrovanadium, ferrochrome and other materials has been shown, which has demand on the world market. Synthesized SHS materials are superior in quality to nitrided ferroalloys obtained by conventional furnace method, in particular, they have a lower content of oxygen, hydrogen and other impurities, and differ in better physical and mechanical properties: density, porosity, strength, and others. Based on the method of metallurgical SHS, the production of nitrided ferroalloys and composite ligatures with the possibility of processing up to 5000 ton per year of cyclone dust of ferrosilicon and other alloys was established in Russia, Magnitogorsk on the production base of scientific and technical production company LLC “STPF “Etalon”. A new approach to the practical implementation of the SHS method is developed and the possibility of using synthesis products in metallurgy is shown. The main application of these products is the use of alloying additives in smelting of a wide range of steels and alloys: transformer, rail, stainless, high-strength structural, and others. Another popular consumer of composite “metallurgical” SHS materials is the refractory production. Modification of traditional refractories used in smelting of cast iron, steel and non-ferrous metals with new composite SHS materials based on nitrides, borides, carbides and other refractory compounds can significantly increase the service life and reduce the expenses for refractories.