Abstract

A qualitative and quantitative chemical analysis of samples of sludge from a thermal power plant obtained after magnetic separation has been carried out. It is shown that the main components of the material are iron and silicon (partially in the form of oxides). A technological scheme for the utilization of sludge is proposed, including the magnetic separation of slags and their subsequent processing by melting their mixture with sodium tetraborate. As a result of the study of the chemical and phase composition of the resulting alloy, it was found that it contains about 86.4% Fe, 10.6% Si and 0.9% C, which leads to the formation of the predominant phases Fe3Si and Fe3C in the alloy composition close to the composition of ferrosilicon - ferroalloy, which is widely used in the production of cast irons and high-quality silicon steels.

Keywords: Ash; Slag; Utilization; Ferroalloy; Iron; Silicon; Oxide; Ingot