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ArticleName Magnetizing roasting and magnetic separation of highphosphorus brown iron ore from the Kirovskoe deposit
DOI 10.17580/or.2023.05.02
ArticleAuthor Mukhtar A. A., Makashev A. S., Atakhan M. M., Gabdullin S. T.

J. Abishev Chemical and Metallurgical Institute (Karaganda, Kazakhstan)

Mukhtar A. A., Head of Laboratory, Candidate of Engineering Sciences, Associate Professor,
Makashev A. S., Senior Researcher
Atakhan M. M., Engineer
Gabdullin S. T., Head of Laboratory, Candidate of Engineering Sciences


This article presents the results of research carried out in order to develop a processing technology for high-phosphorus oolitic brown iron ores from the Kirovskoe deposit in Kazakhstan with the following initial composition: 37.95 wt% of iron, 0.56 wt% of phosphorus, 3.30 wt% of aluminum oxide, and 29.14 wt% of silicon oxide. The material composition of the ore, studied by X-ray phase analysis, is represented mainly by the iron mineral of hydrogoethite, with an insignificant amount of hematite as an admixture. The nonmetallic part of the sample mainly consisted of clay minerals, silicon and aluminum oxides, and was removed through desliming. The resulting product was subjected to dry magnetic separation (DMS) in a high-intensity magnetic field, which rendered a magnetic product with an iron content of 48.18 wt%. In order to improve the product grade, the DMS product was further subjected to magnetizing roasting aimed to convert iron hydroxides into magnetite and remove hydrate moisture. The magnetic roasting cinder then underwent wet magnetic separation in a weak magnetic field to produce a concentrate containing 64.13 wt% of iron, 0.941 wt% of phosphorus, 5.09 and 3.92 wt% of aluminum and silicon oxides, respectively. The throughout recoveries into the final concentrate were: 74.86 % for iron, 75.23 % for phosphorus, and 67.70 and 5.96 % for aluminum and silicon oxides, respectively, with a concentrate yield of 44.30 %. Based on the relevant laboratory research, a process has been developed, including desliming, magnetizing roasting, and magnetic separation, that renders high-grade iron concentrates.

This research was supported under an agreement concluded between the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan and the Zh. Abishev Chemical and Metallurgical Institute (grant IRN No. AP19675375).

keywords High-phosphorus brown iron ore, oolites, desliming, magnetic separation, reducing agent, magnetizing roasting, dehydration

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