Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. shock rate 3. compositors case of HM ?Advantages of suffering Si-S in HM 1. slight rage required to smother SiO2 in BF 2.Cost reduction in nerve making 3.Less slopping tendency (directly proportional to Si content in HM) 4. shuffle refractory consumption 5.Oxygen consumption 6.Less tap period 7.Slag handling 8. outgrowth in productivity ?Sources 1.Si: snowfall form and gangue in oxide feed 2.S : with hundred 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 coveted level. High earn pressure in Blast Furnaces brush aside favour low silicon tempestuous metal.(also high go by pressure implies less(prenominal) boudard reaction thusly less carbon impairment thus lesser coke rate) The input used e.g. sinter and conjure ore have little control on the destiny Al2O3 in slag which makes the slag viscous and sulphur deepen from metal to slag difficult. (higher alumina implies higher the viscosity of slag) Sulphur- 80% to 90% in slag, 10% to 15% in good luck dust, 2% to 5% in HM Silicon Coke burns in BF running region in forepart 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. indeed SiO vapour is unstable, and the silicon monoxide feature thus generated at the beat of coke combustion in front of the tuyeres further reacts with carbon of the descending metal droplets in the region between the drivel and the hearth and gets reduced and transferred as silicon in the hot metal, according to the following reactio ns: SiO (g) + [C] ? [Si] + CO (g) Or by p! utrefaction as, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a complete essay, order it on our website: OrderCustomPaper.com

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