magnetite and sinter

Jun 11, 2019· Jun 11, 2019· Sintering: A Step Between Mining Iron Ore and Steelmaking. The USGS defines iron ore as a mineral substance which, when heated in the presence of a reductant, will yield metallic iron (Fe). It almost always consists of iron oxides, the primary forms of which are magnetite (Fe3O4) and hematite (Fe2O3). It's a major ingredient in steel.

While magnetite, fayalite and glass containing iron oxides are the major mineral phases for siliceous sinter, the ferrites, magnetite and mixed calcium iron silicates are the major mineral phases for fluxed sinter . Sintering is a fast process and it is unlikely that equilibrium will be reached during sintering.

EFFECT OF MAGNETITE, HEMATITE AND PELLET SCREENINGS AS FEED IN SINTER PRODUCTION Mikael Pettersson1, Peter Sikström1 and Dr. Volker Ritz2 1LKAB, 952, 971 28 Luleå, Sweden 2SGA, Grubenstrasse 5, 38704 Liebenburg, Germany Abstract During the last years, the availability of coarse, high quality sinter feed has decreased.

blending ratio of magnetite ore in sinter mixture, Fe2+ in the iron ore sinter increases, which results in lower reduc-ibility.1) Therefore, in the sintering process, promoting magnetite oxidation to hematite is important for high reduc-ibility. In addition to the above-mentioned effects, oxidation

Apr 09, 2008· Because sintering in the magnetite phase started earlier (950 °C) compared to the hematite phase (1100 °C), the difference in shrinkage rates between these two phases was largest at around 1100 °C and was larger for the finer raw materials. Finer grind in the raw material would, therefore, promote the formation of duplex structures.

Mar 29, 2012· We have developed a simple process for sintering of soft magnetization materials using microwave sintering. The saturated magnetization (Ms) of sintered magnetite was 85.6 emu/g, which was as high as 95% of magnetite before heating (90.4 emu/g). On the other hand, the averaged remanence (Mr) and coercivity (Hc) of the magnetite after heating were 0.17 emu/g and …

ISIJ International, Vol, producedsinter wasmainly bondedby silicates andhigh temperature morphologySFCA(silico-ferrite of calcium andaluminium). Basedon the observations in the study, it wasidentified that increasing hematite sintering fines was a practical wayto improve sintering performance and sinter quality, besides promoting magnetite ore oxidation and adopting low coke rate sintering.

3.3. Magnetite Oxidation during Sintering Magnetite oxidation may be expressed by DH 298 ° 27400cal Obviously, the oxidation of magnetite is an exothermic re-action. The heat generated is roughly equivalent to that of 0.29mol carbon being combusted to CO 2 (C O 2 CO 2, DH°298 94490cal) when complete oxidation is achieved.

ISIJ International, Vol. 37 (1 997), No. 9, pp. 854-861 Oxidation tlons and Sintering of Magnetite Ore under Oxidising Condi- L, X. YANGand E. MATTHEWS BHPResearch Newcastle Laboratories. P.O, Box 188, Wallsend, NSW2287, Australia. (Received on,4pril 7. 1997.• accepted In final form on June2. 1997) E-mail: yang.lisa.1((7'bhp.com,au Theoxidation of magnetite mineral in a wide range of iron ...

ISIJ International, Vol. temperature zoneto supply the necessary heat for sinter- ing reactions. COand C02are generated in the com- bustion. Other componentsin the exhaust gas are free oxygen arid nitrogen. In self-fluxed sinter production from a magnetite concentrate, it wasfound that waste gas composition was C02=200/o, C0=20/0and 02= 6o/o at 4min sintering andbecameC02=2o/o, CO Io/o ...

sintering of magnetite starts at lower temperatures than hematite sintering, the non-oxidized or unreacted magnetite in the core shrinks away from the hematite shell, thus forming a socalled - duplex structure [1], [3], [4]. The duplex structure with non-oxidized magnetite core and oxidized

3.3. Magnetite Oxidation during Sintering Magnetite oxidation may be expressed by DH 298 ° 27400cal Obviously, the oxidation of magnetite is an exothermic re-action. The heat generated is roughly equivalent to that of 0.29mol carbon being combusted to CO 2 (C O 2 CO 2, DH°298 94490cal) when complete oxidation is achieved.

In this work, sintering performance of two typical magnetite concentrates (MC-1# and MC-2#) from China and Australia, respectively, were compared through mini-pot (100 500 mm) sintering tests in ...

Studies havebeencarried out for sintering of magnetite ore alone.5) It wasfound that magnetite wasless reactive than hematite and piso]ite, and therefore required high sintering temperature to ensure adequate sinter strength. This maybe the main reason whya high coke rate is often associated with magnetite ore blend sintering. Underan oxidising ...

EFFECT OF MAGNETITE, HEMATITE AND PELLET SCREENINGS AS FEED IN SINTER PRODUCTION Mikael Pettersson1, Peter Sikström1 and Dr. Volker Ritz2 1LKAB, 952, 971 28 Luleå, Sweden 2SGA, Grubenstrasse 5, 38704 Liebenburg, Germany Abstract During the last years, the availability of coarse, high quality sinter feed has decreased.

The iron ore sintering process is mainly subject to the bonding phases which can effectively bond with solid phases such as hematite and magnetite to form the product sinter with good strength.