Abstract
Recovery and recycling of substandard metallic iron is a very urgent task from an environmental and economic point of view. At present increased attention is being paid to the problems of recycling metal waste, but relatively few methods of recycling have been developed. An electrochemical method is a promising approach, which makes it possible to obtain valuable products that are in demand by the industry. These are ferrites of alkaline earth metals, in particular, barium and strontium ferrites. Their valuable properties, for example, high coercive force, saturation magnetization, corrosion resistance and resistance to temperature changes, make them popular materials. In this regard, this study proposes a method of anodic oxidation of steel 3 in an aqueous saline solution, followed by the transition of the dissolution products into an electrolyte with the formation of a hydrated precipitate and its subsequent heat treatment. This method involves simple hardware design, environmental safety and low costs. This article discusses the features of anodic oxidation of steel 3 in aqueous salt solutions of barium and strontium compounds. It was revealed that activator ions, for example, chloride ions, which contribute metal oxidation, are necessary for the dissolution of steel in a nitrate solution. The results of high-temperature treatment of the resulting precipitate, in which the presence of two phases was established: strontium hexaferrite and iron III oxide. Thermal studies of dispersed precipitation at different temperature ranges demonstrate the presence of endothermic effects associated mainly with the removal of different forms of water.
Published Version
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