Combined processing and dephosphorization of brown iron ore of the Kokbulak deposit
Mukhtar A.A. Makashev A.S. Kasymova B.K. Atakhan M.M.
2024Ore and Metals Publishing house
Obogashchenie Rud
2024#2024Issue 23 - 7 pp.
The article presents studies aimed to establish the possibility of obtaining iron ore concentrate with low phosphorus content from high-phosphorus ore (with mass fractions of iron of 43.67 % and phosphorus of 0.89 %) of the Kokbulak deposit in Kazakhstan (Northern Aral Sea region). The mineral and grain-size compositions of Kokbulak ore have been studied. According to the X-ray phase analysis data, the ore is represented by goethite-hydrogoethite, hydrogoethite, and quartz. Grain-size composition analysis has shown the highest concentration of iron for the fractions of –1.0 +0.5 and –0.5 +0.315 mm. Laboratory research was conducted to develop and test a combined process that included dry magnetic separation of ore in a strong magnetic field, oxidizing roasting of the resulting oolitic magnetic middlings at 850 °C for 60 minutes for the purpose of destruction and dehydration of oolites and activation of phosphorus in them, and subsequent dephosphorization of the roasting product by leaching with a 5 % sulfuric acid solution. The technology for removing phosphorus from brown iron ores by roasting and leaching with a weak sulfuric acid solution was selected as the most promising option, since it had successfully passed the pilot tests at Arcelor Mittal Temirtau JSC using gravity-magnetic concentrate from the Lisakovsk deposit. The process developed during the research rendered cake (final concentrate) with a yield of 91.60%. The mass fraction of iron in the cake was 58.45% and the mass fraction of phosphorus was 0.26 %, with the total recovery of iron, phosphorus, silicon, and aluminum oxides at 93.22, 20.35, 37.91, and 68.49 %, respectively.
brown iron ore , dephosphorization , leaching , magnetic separation , oolites , oxidizing roasting
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J. Abishev Chemical and Metallurgical Institute, Karaganda, Kazakhstan
Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan
J. Abishev Chemical and Metallurgical Institute
Abylkas Saginov Karaganda Technical University
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