Stary Oskol Technological Institute named after A. A. Ugarov (branch) of the National University of Science and Technology MISIS (Stary Oskol, Russia)
A. V. Karamin, Postgraduate Student, andrey31.karamin@yandex.ru
V. A. Sklyar, Cand. Eng., Associate Prof., vitaliiskliar@gmail.com
E. A. Chermenev, Cand. Eng., Associate Prof., fenix–evg@yandex.ru
Stary Oskol Technological Institute named after A. A. Ugarov (branch) of the National University of Science and Technology MISIS (Stary Oskol, Russia)1 ; Branch of the National University of Science and Technology MISIS (Gubkin, Russia)2
A. A. Kozhukhov, Dr. Eng., Associate Prof., Deputy Director for Science and Innovation1,2, kozhukhov.aa@misis.ru
The article presents the results of a comprehensive analysis of the chemical and mineralogical composition of integrated sludges formed at different stages of the production of oxidized pellets, their subsequent metallization in shaft furnaces, and briquetting in roll presses. The sources of sludge formation have been analyzed, and it has been shown that the integrated sludge from the pelletization and metallization processes will be a mixture of sludge and dusts of various chemical compositions, characteristic of each stage of the production chain. Chemical analysis data show a sufficient amount of iron in both pelletizing sludge and metallization sludge, which makes it possible for them to be returned to the technological process or processed in other metallurgical units. At the same time, the study of the granulometric composition shows that the sludge particles have a sufficiently high fineness, which limits the possibility of their return to the pelletizing stage. The mineralogical analysis data, in turn, show that the iron in the sludge is mainly in the form of non-magnetic hematite, which makes it impossible for them to return to the grinding stage, since hematite will not be extracted by the available magnetic separation equipment. Thus, a comprehensive assessment of the metallurgical properties of pelletizing and metallization sludges allows us to recommend the process of cold briquetting or vacuum extrusion with the addition of binding materials for the processing of sludge from this group. In this case, it will be possible to maintain a stable composition of briquettes by changing the proportion of pelletizing and metallization sludges in the mixture, which facilitates their subsequent disposal in metallurgical units.
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