INVESTIGATION OF THE SINTERING PROCESS WITH PARTICIPATION OF MAGNETITE CONCENTRATES OF THE KOVDOR DEPOSIT IN THE CHARGE

 Using the method of electronic microanalysis, it has been established that in magnetite ores magnetite crystals, depending on the  temperature-time conditions of natural ore formation, have different  microstructure. So in the composition of sedimentary-metamorphic  ferruginous quartzites and magmatic skarns, magnetite crystals have a homogeneous structure and are close in composition to stoichio metry.  In the Kovdor deposit, magnetite crystals have a heterogeneous structure, in the matrix of crystals of which the isomorphic impurities of  Al,  Mg, Ti, etc. exist as separate spinel microphases. When the crystals of  Kovdor magnetite are restored under conditions close to agglomeration, it is established that in the process of agglomeration, crystals of  a heterogeneous structure are destroyed with the formation of two ore  phases: solid solutions of magnetite and wustite that do not participate  in liquid-phase hardening of agglomerates. At the final stage of production of fluxed agglomerates, calcium silicate bonds (melilitic composition) with low strength properties are formed in the composition of  the finished product at the melt site. In accordance with the results of  the present study, the physical and chemical processes of hardening of  fluxed agglomerates using magmatic ores of different genesis it is suggested, when buying iron ore deposits, to pay attention not only to the  content of iron oxides and silicon in the ores, but also on the structural  features of crystals of magnetite itself. At the same time, there are a  number of magmatic ore occurrences in which the magnetite crystals  have a heterogeneous structure.

1. Tatarinov L.M. Usloviya obrazovaniya mestorozhdenii rudnykh i nerudnykh poleznykh iskopaemykh [Conditions for the formation of  deposits of ore and non-metallic minerals]. Moscow: Gosgeotekhizdat, 1955, 280 p. (In Russ.).

2. Sinyakov V.I. Osnovy teorii rudogeneza [Fundamentals of the theory of ore genesis]. Leningrad: Nedra, 1987, 192 p. (In Russ.).

3. Ovchinnikov L.N. Obrazovanie rudnykh mestorozhdenii [Formation of ore deposits]. Moscow: Nedra, 1988, 285 p. (In Russ.).

4. Rostovtsev S.T. In: Teoriya i praktika metallurgii [Theory and practice of metallurgy]. 1938, no. 6, pp. 3–9. (In Russ.). 

5. Ramm A.N. Theoretical bases of application of fluxed sinter in blast  furnaces. In: Trudy NTO ChM. Vol. 8. Moscow: Metallurgizdat,  1956, pp. 44–64. (In Russ.).

6. Luyken W. Die Vorbereitung des Hochofenmöllers einschließlich des Hochofenkokses. Berlin u. a., Springer-Verl., 1953. (Russ.ed.:  Luyken W. Podgotovka syrykh materialov k domennoi plavke. Moscow: Metallurgizdat, 1959, 412 p.).

7. Parfenov A.M.  Osnovy aglomeratsii zheleznykh rud [Basics  of  sintering of iron ores]. Moscow: Metallurgizdat, 1961, 320 p. (In  Russ.).

8. Yakubtsiner N., Gorelik I. Manufacture of self-melting sinter from  magnetite ore and smelting of cast iron from it. Stal’. 1940, no. 5-6,  pp. 1–3. (In Russ.).

9. Khokhlov D.G., Miller V.Ya. Theory and practice of production of  fluxed sinter. Stal’. 1955, no 6, pp. 488–497. (In Russ.).

10. Babushkin N.M., Timofeev V.N. Experimental study of the carbon  combustion in the layer of sintering charge. In: Nauchn. tr. VNIIMT.  Moscow: Metallurgizdat, 1962, no 7, pp. 17–47. (In Russ.).

11. Sigov A.A., Shurkhal V.A. Aglomeratsionnyi protsess [Sintering  process]. Kiev: Tekhnika, 1969, 232 p.

12. Malysheva T.Ya. Petrografiya zhelezorudnogo aglomerata [Petrography of iron ore sinter]. Moscow: Nauka, 1969, 168 p. (In Russ.).

13. Malysheva T.Ya. Zhelezorudnoe syr’e, uprochnenie pri termoobrabotke [Iron ore raw materials, hardening at heat treatment]. Moscow: Nauka, 1988, 197 p. (In Russ.).

14. Korotich V.I. Osnovy teorii i tekhnologii podgotovki syr’ya k domennoi plavke [Fundamentals of the theory and technology of raw material preparation for blast furnace smelting]. Moscow: Metal lurgiya,  1978, 210 p. (In Russ.).

15. Korotich V.I., Frolov Yu.A., Bezdezhskii G.N. Aglomeratsiya rudnykh materialov [Sintering of ore materials]. Ekaterinburg: UGTUUPI, 2003, 400 p. (In Russ.).

16. Vegman E.F. Okuskovanie rud i kontsentratov [Sintering of ores and  concentrates]. Moscow: Metallurgiya, 1968, 257 p. (In Russ.).

17. Bazilevich S.V., Vegman E.F. Aglomeratsiya [Sintering]. Moscow:  Metallurgiya, 1967, 368 p. (In Russ.).

18. Puzanov V.P., Kobelev V.A. Strukturoobrazovanie iz melkikh materialov s uchastiem zhidkikh faz [Structuration from small materials  with the participation of liquid phases]. Ekaterinburg: UrO RAN,  2001, 633 p. (In Russ.).

19. Malysheva T.Ya., Dolitskaya O.A. Petrografiya i mineralogiya zhelezorudnogo syr’ya [Petrography and mineralogy of iron ore raw  materials]. Moscow: MISIS, 2004, 423 p. (In Russ.).

20. Puzanov V.P., Kobelev V.A. Vvedenie v tekhnologiyu metallurgicheskogo strukturoobrazovaniya [Introduction  to  the  technology of metallurgical structure formation]. Ekaterinburg: UrO RAN,  2005, 501 p. (In Russ.).

21. Bowen N.L., Schaiser J.F., Posnjak E. The system CaO – FeO –  SiO2 . Am. J. Sci, 5th Ser. 1933, vol. 26, pp. 193–284. 

22. Allen W.C., Snow R.B. The orthosilicate iron oxide portion of  the system CaO – FeO – SiO2 . J. Am. Ceram. Soc. 1955, vol. 38,  pp.  264–280.

23. Kisin D.A., Litvinova T.I. Sintering of iron ores. Stal’. 1960, no 5,  pp. 397–403. (In Russ.).

24. Livshits  B.A.,  Vasil’ev  G.S.  Composition  of  sinters.  Izvestiya VUZov. Chernaya metallurgiya = Izvestiya. Ferrous Metallurgy.  1964, no 6, pp. 23-29. (In Russ.).

25. Utkov V.A. Vysokooflyusovannyi aglomerat [Highly fluxed sinter].  Moscow: Metallurgiya, 1977, 155 p. (In Russ.).

26. Gaidukova V.S. Elektronnaya mikroskopiya dlya resheniya prakticheskikh geologo-mineralogicheskikh zadach [Electron microscopy for solving practical geological and mineralogical problems].  Moscow: Nedra, 1983, 225 p. (In Russ.).

27. Malysheva T.Ya., Pavlov R.M., Mansurova N.R., Detkova T.V.  Effect of natural ore formation on mineral composition and cold  strength  of  iron  ore  fluxed  sinters.  Izvestiya VUZov. Chernaya metal lurgiya = Izvestiya. Ferrous Metallurgy. 2015, vol. 58, no 3,  pp. 180–185. (In Russ.).

28. Pisarev S.A., Kurenkov D.S., Malysheva T.Ya. Behavior of magnetite ores of Kovdor deposit in sintering process. Izvestiya VUZov. Chernaya metallurgiya = Izvestiya. Ferrous Metallurgy.  2016,  vol.  59, no 5, pp. 354–356. (In Russ.).