STUDY OF THE PROPERTIES OF OILED FINE-DISPERSED OIL FROM THE VILALS OF THE METALLURGICAL PLANT

Abstract

The task of obtaining of iron-containing secondary raw materials from finely dispersed oily slag accumulated in the dumps of metallurgical plants of Ukraine is important and urgent. This slag contains from 60 % to 75 % of iron oxides. Every year, up to 2.5 million tons of it is dumped into the dumps of PJSC “Kryvorizhstal” alone. To determine the favorable conditions for degreasing and cleaning of dump slag, studies of its structure, composition, physicochemical and technological properties were conducted. It is shown that, in addition to iron oxides, oil and water, there is a significant amount of more than 30 % of the amount of organic matter. The relative amount of components is different. A liquid reagent for the separation of organics from the starting material is defined. When the slag cleaned of organic matter is heated to 500 °C, a gradual decrease in the mass of the sample occurs, until it stops with exposure, with the preservation of all original iron oxides, FeO, Fe3O4 and Fe2O3, in the final product, in the absence of oil. When the slag is further heated to 950 °C, up to 97.5 % of hematite, Fe2O3, was obtained as the final product. In addition to hematite, oxides of other metals and more than 1.3 % of quartz are present in the final product in small quantities, up to 1.2 %. Bibl. 12, Fig. 8, Tab. 1.