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

A. A. Mukhtar, Cand. Eng., Associate Prof., Head of the Laboratory “Enrichment of ores”
A. S. Makashev, Senior Researcher, Laboratory “Enrichment of ores”
B. K. Kasymova, Engineer, Laboratory “Enrichment of ores”, e-mail: bkosimova@mail.ru
M. M. Atakhan, Engineer, Laboratory “Enrichment of ores”

This paper presents the results of research on the dephosphorization of high-phosphorus brown iron ore concentrate obtained from the ore at the Kirovskoe deposit (Republic of Kazakhstan). The initial ore of this deposit is similar in its geological, structural, and chemical composition to the ore of the Lisakovskoe deposit, where beneficiation scheme consists of the following sequential technological operations: grinding, desliming, dry magnetic separation, reducing roasting and wet magnetic separation. The obtained concentrate, despite its high iron content, is noncompliant in terms of phosphorus content and requires additional processing to reduce the phosphorus content to the level which is acceptable for the metallurgical industry. According to the scheme, which includes such operations as grinding, desliming, dry and wet magnetic separation, and reducing roasting with addition of 3 % calcinated soda and 4 % coke to the charge, a concentrate with Fe content 63.9 % and P content 0.945 %, with a product output 86 %, was obtained from ore at the Kirovskoe deposit. The high-phosphorus concentrate obtained at the Kirovskoe deposit was leached by 5 % sulfuric acid solution, with a liquid/solid ratio 3:1 during 60 min, resulting in a dephosphorized concentrate with an iron content 65.3 %, phosphorus content 0.189 % and output 88.5 %. X-ray analysis showed that introduction of calcinated soda into the charge during roasting improves reduction of goethite and promotes formation of a nepheline-like phase, enriched with sodium and having high fluidity and low melting temperature. This phase facilitates penetration of oolites into cracks and effective removal of impurities, including phosphorus, during leaching.

This research was carried out under financial support of the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant IRN No. АР19675375).

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