Mar 10, 2016· The silica and alumina bearing minerals present in the iron ore are quartz, kaolinite, montmorillonite, illite, gibbsite, diaspore and corundum. Out of these, it is often observed that, kaolinite and gibbsite are the two main alumina bearing minerals present in iron ore.
Low Al2O3 in ore facilitates and helps in maintaining lower alumina in slag without increasing slag rate and keeps it fluid. However in sponge iron making (DRI) the SiO2 / Al2O3 ratio should
Jan 01, 2011· The iron ore slimes were in situ sieved and analysed with 94.4% present as < 25 microns particles. The sub-25 micron fraction contained 58.8% Fe, 5.74% SiO 2, 6.65% Al 2 O 3 and 0.15% P. The bulk mineralogical analysis of iron ore rejects slime is shown in Table 1 which contained about 13% silica and alumina gangue minerals. It was used as
Sep 08, 2017· Alumina during ironmaking enters the process through impurities in the input materials mainly iron ore. 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.
Increase in alumina content increases the viscosity of the slag which is difficult to separate from molten slag. Usually the Alumina in iron ore should be less than 2%.
A high alumina/silica ratio greater than 1.2-1.9 in pellet feed adversely affects the firing temperatures, slag melt distribution and hence the physical strength of the fired pellets.
Apr 01, 2012· The contents of hematite Issue 4 Effect of Basicity and Alumina-Silica Ratio on Formation of Silico-Ferrite of Calcium and Aluminum -3. ‘r( Y \ I \ z ;SFCA . A 1.6 2.0 2.4 2.8 3.2 Basicity Fig. 3 Effect of basicity on mineralogical components of sintering sample and porosities did not take on any obvious variations initially, but
[Show full abstract] head sample contained about 49.2 percent Fe, 8.79 percent alumina and 12.01 percent silica. The received iron ore sample is amenable to upgradation through beneficiation to
May 27, 2013· BF slag Al2O3 content is mainly dependent on the Al2O3 content of the input materials mainly iron ore. In those cases where iron ore Al2O3 content is less than 1 % the Al2O3 content in the slag hardly goes above 10 %. But in those iron ores where Al2O3 content is 2 % and higher, raise the Al2O3 levels in BF slag to 20 % and higher.
Iron ore requirement to meet the objective of draft NSP Quality / Size Requirement of Iron Ore in Steel Industries The quality requirement of iron ore concentrate for steel production in India is mainly governed by silica and alumina. Apart from silica and alumina other minor deleterious
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Jan 01, 2011· The iron ore slimes were in situ sieved and analysed with 94.4% present as < 25 microns particles. The sub-25 micron fraction contained 58.8% Fe, 5.74% SiO 2, 6.65% Al 2 O 3 and 0.15% P. The bulk mineralogical analysis of iron ore rejects slime is shown in Table 1 which contained about 13% silica and alumina gangue minerals. It was used as
This study investigates the removal of silica and alumina as impurities from hematite based low-grade iron ore containing 34.18 mass% iron, 31.10 mass% of silica and 7.65 mass% alumina. Wet high-intensity magnetic separation (WHIMS) and reverse flotation (RF) were investigated. In WHIMS process, 93.08% of iron was recovered with a grade of 53
May 01, 2013· The IR thermography based sorting can be a new non-invasive technique for rejection of alumina-rich iron ore lumps/fines. By rejection of alumina-rich ores, not only the alumina content in the useful iron ore shall be reduced significantly but also the alumina/silica ratio can be maintained <1 which is suitable for blast furnace feed.
Apr 01, 2012· The contents of hematite Issue 4 Effect of Basicity and Alumina-Silica Ratio on Formation of Silico-Ferrite of Calcium and Aluminum -3. ‘r( Y \ I \ z ;SFCA . A 1.6 2.0 2.4 2.8 3.2 Basicity Fig. 3 Effect of basicity on mineralogical components of sintering sample and porosities did not take on any obvious variations initially, but
Iron Ore Alumina Differential per 1% with <5% (55-60% Fe Fines) TSIAF00 TSIAF03 Assessment Daily PMA1105 1% alumina below 5% for fines with 55-60% Fe $/dmt Iron Ore Silica Differential per 1% with 3-4.5% (60-63.5% Fe Fines) IOALF00 IOALF03 Assessment Daily PMA1105 1% silica within 3-4.5% range for fines with 60-63.5% Fe $/dmt
Amongst the gangue materials present in iron ore, Silica (Si02) and Alumina (A1203) are the most important. In Indiarkiron ore alumina is more and alumina to silica ratio is more than one. Quality of iron ore or agglomerate is judged by the assessment of several properties through some
A higher percentage of silica in the sinter mix counters the effect of high alumia in th ore. It is always desirable to have alumina/silica ratio in the sinter mix as 0.5 or below. Alumina plays an important role in reshaping and coalescing process during the sintering process by changing the physiochemical properties of the primary melt.
Head of Global Sales –Iron Ore Anglo American Higher Value Iron Ore For Efficient Iron Makers. 2 Lower silica and alumina HIGH LUMP RATIO 1) Two Lower Iron Grade products and other sub grades were discontinued in 2014 2)
Iron ore requirement to meet the objective of draft NSP Quality / Size Requirement of Iron Ore in Steel Industries The quality requirement of iron ore concentrate for steel production in India is mainly governed by silica and alumina. Apart from silica and alumina other minor deleterious
The effect of alumina and silica on the reaction kinetics of carbon composite pellet at 1474 K (1200°C) was investigated. Following conclusions can be made from this study. (1) The reduction rate of iron oxide in carbon composite pellet was influenced by alumina and silica contents.
Alumina is the common name given to aluminum oxide (Al 2 O 3). Alumina is produced from bauxite, an ore that is mined from topsoil in various tropical and subtropical regions. The Bayer process, discovered in 1887, is the primary process by which alumina is extracted from bauxite. To produce pure aluminum, alumina is smelted using the Hall
Process Of Limestone In Iron. Iron and steel making.basically limestone is used as a slag former.dolomite is used as a slag former, slag modifier and as a refractory material.the process of iron making is the reduction of iron ore to produce iron.iron ore normally contain gangue materials such as silica (sio2), alumina (al2o3) along with sulphur (s) and phosphorus (p).
Aluminum processing Aluminum processing Ores: Aluminum is the third most abundant element on Earth’s surface. Only oxygen and silicon are more common. Earth’s crust to a depth of 16 km (10 miles) contains 8 percent aluminum. Aluminum has a strong tendency to combine with other common elements and so rarely occurs in nature in the metallic form.