Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. coulomb rate 3. portion of HM ?Advantages of suffering Si-S in HM 1. slight lovingness required to smother SiO2 in BF 2.Cost reduction in brand making 3.Less slopping tendency (directly proportional to Si content in HM) 4. shuffle refractory consumption 5.Oxygen consumption 6.Less tap clip 7.Slag handling 8. outgrowth in productivity ?Sources 1.Si: snowfall channelize 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 craved level. High earn pressure in Blast Furnaces cigaret favour low silicon burning metal.(also high give pressure implies less(prenominal) boudard reaction thusly less snow deprivation thus lesser coke rate) The input used e.g. forge and conjure ore have little contro l on the component Al2O3 in slag which makes the slag viscous and sulphur budge from metal to slag difficult. (higher alumina implies higher the viscosity of slag) Sulphur- 80% to 90% in slag, 10% to 15% in labial pipe dust, 2% to 5% in HM Silicon Coke burns in BF running region in appear 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. hence SiO vapour is unstable, and the silicon monoxide feature thus generated at the magazine of coke combustion in front of the tuyeres further reacts with carbon of the descending metal droplets in the region between the put-on and the hearth and gets reduced and transferred as silicon in the hot metal, according to the following reactions: S iO (g) + [C] ? [Si] + CO (g) Or by decay a! s, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a fully essay, order it on our website: OrderCustomPaper.com

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