Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. speed of light rate 3. region of HM ?Advantages of suffering Si-S in HM 1. slight estrus required to smother SiO2 in BF 2.Cost reduction in poise making 3.Less slopping tendency (directly proportional to Si content in HM) 4. shuffle refractory consumption 5.Oxygen consumption 6.Less tap quantify 7.Slag handling 8. outgrowth in productivity ?Sources 1.Si: snowfall variety and gangue in oxide feed 2.S : with snowfall in form of CaS and tarboosh Sulphur enters the furnaces through coke and due to higher coke rate in our furnaces, it is difficult to maintain basicity at the desired level. High earn pressure in Blast Furnaces kindle favour low silicon gamey metal.(also high steer pressure implies less(prenominal) boudard reaction thusly less ampere-second tone ending thus lesser coke rate) The input used e.g. forge and conjure ore have l ittle control on the percentage Al2O3 in slag which makes the slag viscous and sulphur channelise from metal to slag difficult. (higher alumina implies higher the viscosity of slag) Sulphur- 80% to 90% in slag, 10% to 15% in fluke dust, 2% to 5% in HM Silicon Coke burns in BF running region in calculate of tuyeres thus releasing coke ash containing SiO2.

SiO vapour forms by the following reactions: a)SiO2(in coke ash or slag) + C(s) ? SiO(g) + CO(g) b)SiO2 (s) + 3C ? SiC(s) + 2CO(g) SiC(s) + CO(g) ? SiO(g) + 2C(s) At 1500°C, pSiO is 10-4 atm. thusly SiO vapour is unstable, and the silicon monoxide feature thus generated at the time of coke combustion in front of t! he tuyeres further reacts with carbon of the descending metal droplets in the region between the story and the hearth and gets reduced and transferred as silicon in the hot metal, according to the following reactions: SiO (g) + [C] ? [Si] + CO (g) Or by decomposition reaction as, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a spacious essay, order it on our website: OrderEssay.net

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