Kryvyi Rih National University, Kryvyi Rih, Ukraine:

Evtekhov V. D., Professor, Doctor of Geological and Mineralogical Sciences, e-mail: evtekhov@mail.ru

Evtekhov E. V., Assistant Professor, Candidate of Geological and Mineralogical Sciences

Hematite quarzites are one of rock and ore components of iron and silicon formation — the main iron ore source of the planet. According to the different estimations, the exploited reserves of iron ores, which belong to the iron and silicon formation, make from 700 to 800 bn. t, which corresponds to near 70 % of the confirmed global reserves of iron ores. The implication of hematite quarzites into the development is the basic widening direction of mineral raw materials base of iron and silicon formation deposits. The following risks could be rated to the main, connected with the introduction of concentration technologies of hematite quarzites into the manufacturing:
- nonoptimality of mineral composition of the feedstock (low value of ratio martite + micaceous hematite/dispersed hematite + iron hydroxides);
- presence of ore-formation materials in the feedstock composition (the ore-formation materials significantly differ by value of the specific magnetic susceptibility : for example, hematite and magnetite or goethite, hematite and magnetite), (the risks of using the separators with intensive magnetic field);
- disposition of ore minerals (especially martite) to the recrushing during ore preparation.
The results of geological and mineralogical researches are the basis for the quantitative and qualitative estimation of the reserves of hematite quarzites, revelation of mineralogical, chemical, structure, textural and physical factors, which determine their concentrability, for the purpose of the development of optimal concentration technologies for hematite raw materials. In connection with this, Kryvyi Rih National University and Science and Production Association "RIVS" planned to hold the mineralogical and technological researches, aimed at the development of non-traditional economically and ecologically balanced, energy saving and material saving production technologies from the poor hematite ores of high-quality iron-ore concentrate.

1. Belevtsev Ya. N., Kulik D. A., Korzhnev M. N. et al. Zhelezisto-kremnistye formatsii dokembriya evropeyskoy chasti SSSR. Zhelezonakoplenie v dokembrii (Iron and silicon formations of the Precambrian of European part of USSR. Precambrian iron accumulation). Kiev : Naukova dumka, 1992, 228 p.

2. Belevtsev Ya. N., Vaylo A. V., Vetrennikov V. V. et al. Zhelezisto-kremnistye formatsii dokembriya evropeyskoy chasti SSSR. Struktury mestorozhdeniy i rudnykh rayonov (Iron and silicon formations of the Precambrian of European part of USSR. Structures of deposits and ore regions). Kiev : Naukova dumka, 1989, 156 p.

3. Belevtsev Ya. N., Tokhtuev G. V., Strygin A. I. et al. Geologiya Krivorozhskikh zhelezorudnykh mestorozhdeniy (Geology of Kryvyi Rih iron ore deposits). Kiev : Publishing House of Ukrainian SSR Academy of Sciences, 1962, Vol. 1, 484 p.; Vol. 2, 567 p.

4. Pirogov B. I., Porotov G. S., Kholoshin I. V., Tarasenko V. N. Tekhnologicheskaya mineralogiya zheleznykh rud (Technological mineralogy of iron ores). Leningrad : Nauka, 1988, 302 p.

5. Belevtsev R. Ya., Belyaev O. Ya., Vetrennikov V. V. et al. Zhelezisto-kremnistye formatsii dokembriya evropeyskoy chasti SSSR. Metamorfizm (Iron and silicon formations of the Precambrian of European part of USSR. Metamorphism). Kiev : Naukova dumka, 1989, 148 p.

6. Evtekhov V. D., Evtekhov E. V. Syrevaya baza predpriyatiy po proizvodstvu gematitovogo kontsentrata v Krivorozhskom basseyne (Raw materials base of enterprises on the production of hematite concentrate in the Kryvyi Rih basin). Materialy VI Kongressa obogatiteley stran SNG. 28—30 marta 2007 goda (Materials of the VI Congress of Concentrators from the CIS countries. March 28—30, 2007). Moscow : MISiS, 2007, Vol. 2, pp. 113— 114.

7. Lazarenko E. K., Gershoyg Yu. G., Buchinskaya N. I. et al. Mineralogiya Krivorozhskogo basseyna (Mineralogy of the Kryvyi Rih basin). Kiev : Naukova dumka, 1977, 544 p.

8. Bogdanova I. P., Gekht M. I., Dokuchaeva I. N. et al. Tekhnologicheskaya otsenka zheleznykh rud (Technological estimation of iron ores). Izuchenie veshchestvennogo sostava i obogatimosti zheleznykh rud (Study of the material composition and concentrability of iron ores). Moscow : Nedra, 1976, pp. 57—97.

9. Nazarov Yu. P., Smirnov Yu. A. Gornyi Zhurnal — Mining Journal, 2010, No. 10, pp. 64—68.