THE COMPOSITION OF THE CRUSHING AND SORTING PLANTS COARSE-GRAINED PRODUCT OF THE KRYVYI RIH BASIN AS THE SECONDARY IRON ORE RAW MATERIAL

UDC 549 : 553.31 (477.63)
https://doi.org/10.15407./mineraljournal.39.04.089
O.S. Demchenko, V.D. Evtekhov
State institution of higher education "Kryvyi Rih National University"
11, Vitaly Matusevich Str., Kryvyi Rih, Ukraine, 50002
E-mail: o.s.demcgenko@gmail.com; evtekhov@gmail.com
THE COMPOSITION OF THE CRUSHING AND SORTING PLANTS COARSE-GRAINED PRODUCT OF THE KRYVYI RIH BASIN AS THE SECONDARY IRON ORE RAW MATERIAL
Language: Ukrainian 
Mineralogical journal 2017, 39 (4): 89-96
Abstract: The deposits of rich ores of the Kryvyi Rih basin are developed by seven mines and two open pits. In the process of mining ores the non-metallic material with ore-including hematite quartzites, as its main components, is mixed to the ore mass of non-metallic material because of imperfection of mining technologies and complexity of the form of ore deposits. As a result, the total iron content in the extracted ore mass is significantly lower (52—54 wt. %) compared with the corresponding parameters that meet the current requirements of metallurgical enterprises to commercial sinter ore (55—60 wt. %). To increase the content of iron in the commodity ore extracted from the bowels the ore mass is processed at crushing and sorting plants (CSP). The fine-grained product of the last stage of screening is a commercial sinter ore with a content of iron from 55—57 to 60—62 wt. %. The coarse-grained product, which is a waste of enrichment, was studied by the authors of this article as secondary iron-ore raw material for the production of useful end products with different iron content — from 55 to 69 wt. %. According to the results of petrographic, mineralogical and chemical research of the material of 27 samples of the coarce-grained product of all mines and open pits, the main its components (76—77 wt. % of its total mass) are rich iron ores, enriched and ordinary hematite quartzites; the content of low-grade and non-metallic components (shale, silicate and monomineral quartzites) is 23—24 wt. %. The content of petrographic components, the mineral and chemical composition of the coarse-grained product in the direction from the north to the south flank of the Saksagan iron ore district is not significant — for each component in the range of 1—3 wt. %: the number of particles of rich ores, enriched hematite quartzites, non-condition hematite quartzites, shales and vein quartz decreases; in the reverse direction the number of ordinary hematite quartzites increases significantly. The proximity of the mineral composition, structure and texture of the ore and rocky components of the coarce-grained product of different mines gives rise to the development of a single technological scheme for its enrichment.
Keywords:  banded iron formation, Kryvyi Rih basin, rich iron ores, waste products of enrichment, mineral composition, petrographic composition, chemical composition.
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