IMPROVEMENT OF DEEP PROCESSING TECHNIQUES FOR WASTE IN STEEL-MELTING PRODUCTION. Part 2. Development of process flow diagram

The aim of this work is the experimental study of the feasibility and advisability of reducing processing of steel slags in order to obtain the metal and oxide phases, which can be used in the metallurgical industry and in the industry of structural materials. The slag from slag dumps of Zlatoust Metallurgical Works (the Russian Federation) has become the object of the experimental study. These studies have included some experiments on the recovery of slag samples with carbon. The composition of the experimental samples was determined by electron microscope analysis. The carried out theoretical and experimental studies suggested that the mass of the metallic phase obtained during recovering can be up to 20 % by weight of the initial slag and even slightly higher. At the same time, the iron, which is contained in slag, can be recovered almost completely. Besides, some prevailing or significant part of such elements as chrome, nickel, manganese, and some other valuable components can transmit into the composition of metal. It is expedient to carry out the liquid-phase recovery of slag at temperatures about 1500°С or higher to obtain more complete recovery of metals and formation of the consolidated metal phase. This study shows the expediency of the prior solid-phase reduction of the slag at temperatures of 1100 - 1200°C. This process will enable the most part of the iron included in slag as oxides to convert them into the form, which will be susceptible to magnetic separation. The subsequent magnetic separation enables to separate the fraction with a high content of valuable metals from the oxide fraction depleted by valuable metals; this fraction can be used for production of building materials. When designing units for implementation of the developed technology, it is recommended to provide some measures for the utilization of large volumes of carbon monoxide and vapors of the metals presented in the gas phase. The use of the received gas as a reducing agent for preliminary solid-phase slag recovery can become the way of CO utilization. The research allowed developing the scheme of deep processing of slag dumps of this kind.

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