High alumina, usually found in Indian iron-ore conditions, are unsuitable for blast furnace process. Alumina being acidic, it decreases the basicity of slag, thereby leading to a thicker slag...
Dong et al. indicated that the high alumina content was bad for the melt formation and fluidity properties of iron ores, and had an adverse effect on sinter quality .
Alumina affects the sintering of iron ore. The most harmful effect of alumina is to worsen the RDI (reduction degradation index) value of sinter. RDI value increases as the alumina content rises. It is seen that within a 10 % to 10.5 % CaO content range, an increase of 0.1 % in the alumina content raises the RDI by 2 points.
In iron making, the adverse effect of alumina on reducibility, coke rate, productivity and blast furnace operation is well established and with the characteristic high alumina present in Indian 361 Fig 1: Blending ratio in Composite 24
However, due to the limited reserves and increasing depletion of high-grade iron ore resources, the alumina content of iron ores is expected to increase gradually. While the increase in such...
Due to depletion of high grade iron ore resources, alumina content in the iron ore fines is expected to increase gradually. Ore with higher alumina content is usually expected to be detrimental in forming the sinter matrix, if sintered alone, due to the low reactivity of alumina bearing minerals and the high viscosity of primary melts.
However, due to the limited reserves and increasing depletion of high-grade iron ore resources, the alumina content of iron ores is expected to increase gradually. While the increase in such constituents is relatively slow over a long period, it has still caused problems for blast furnace operators.
Alumina is one of main impurities present in iron ores usually come from clay minerals such as kaolinite, montmorillonite, illite, alunite and gibbsite, and from laterite minerals (Singh and...
Effect of high alumina on slag High Al2O3 content in BF slag has many adverse effects. The increase of Al2O3 in the iron ore not only affects the strength of the sinter, but also its characteristics at high-temperatures in the cohesive zone.
High silica, low alumina iron ores have no specific disadvantage in blast furnace iron making, unless silica is so high that it results in large slag volume. Low Al2O3 in ore facilitates and helps...
Considerable emphasis has therefore been placed on the chemical composition and consistency of iron ore fines, particularly in terms of alumina content. However, due to the limited reserves and increasing depletion of high-grade iron ore resources, the alumina content of iron
7/5/2015· Iron ore is being used for iron and steel production. It is being used in two forms, lump and fines. The High alumina percentage in ores results in high sintering tempera-ture, longer sintering time, increase in fuel rate and lower productivity. These can be of the
Iron ore pellets are largely characterized by inherent physical and chemical properties of the ore. Alumina and silica play important roles in determining the productivity of a Blast Furnace. Mohanty S, Nayak B, Konar J (2017) Beneficiation of high-alumina bearing iron
Indian iron ores are rich in iron but contain high alumina (as high as 7%) .The alumina content in the iron ore fines used for sinter making /pellets all over the world is less than 1%,whereas
Zhang M., Andrade M.W. (2017) Effect of Alumina and Magnesia on Microstructure and Mineralogy of Iron Ore Sinter. In: Ikhmayies S. et al. (eds) Characterization of Minerals, Metals, and Materials 2017. The Minerals, Metals & Materials Series. Springer
The ore contains high alumina and sili-ca and it is to be used as feed in steelmaking; however these impurities adversely affect the production of pig iron and steel . High silica and alumina also form high viscous slag with greater volume in blast furnaces which
10/3/2016· Flotation studies of naturally occurring iron ores further established the fact that it is easier to upgrade the iron values from a high silica ore compared to a high alumina ore. It was possible to produce an overall iron concentrate containing 62% Fe with 86% recovery for a silica bearing ore, but the grade and recovery of an alumina bearing ore were found to be low.
1/1/2021· Effect of alumina and silica content in the calcium aluminosilicoferrite Ca 2 (Ca,Fe,Mg) 6 (Fe,Si,Al) 6 O 20 bonding phase on the strength of iron ore sinter Author links open overlay panel Roland Mežibrický a b c Tamás Csanádi d Marek Vojtko d Mária Fröhlichová b Rainer Abart c
Indian blast furnaces are running of high alumina slag due to high alumina to silica ratio in ores. slag mainly contains lime(CaO), silica (SiO 2),alumina(Al 2 O 3) and magnesia(MgO) along with smalleramount of FeO, MnO, TiO 2, K 2 O and S. The flow
in high-alumina ores. Another study reported on the effect of limestone distribution in quasi-particle on sintering of iron ores, and the sintering performance was improved at Kashima Works No. 2 Sinter Plant by separately granulat-ing high and low CaO quasi