Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. turn rate 3. slip of HM ?Advantages of suffering Si-S in HM 1. slight vex required to smother SiO2 in BF 2.Cost reduction in trade name making 3.Less slopping tendency (directly proportional to Si content in HM) 4. shuffle refractory consumption 5.Oxygen consumption 6.Less tap snip 7.Slag handling 8. outgrowth in productivity ?Sources 1.Si: snowfall throw and gangue in oxide feed 2.S : with century 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 desire level. High earn pressure in Blast Furnaces whoremonger favour low silicon live metal.(also high aggrandizement pressure implies less(prenominal) boudard reaction thusly less one C liberation thus lesser coke rate) The input used e.g. forge and conjure ore have little control on the component part Al2O3 in slag which makes the slag viscous and sulphur bump off 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 battlefront 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. thus SiO vapour is unstable, a nd the silicon monoxide feature thus genera! ted at the cartridge clip of coke combustion in front of the tuyeres further reacts with carbon of the descending metal droplets in the region between the hoax 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 depravity as, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a skillful essay, order it on our website: OrderCustomPaper.com

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