Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. ampere-second rate 3. share of HM ?Advantages of suffering Si-S in HM 1. slight awake required to smother SiO2 in BF 2.Cost reduction in marque making 3.Less slopping tendency (directly proportional to Si content in HM) 4. shuffle refractory consumption 5.Oxygen consumption 6.Less tap sentence 7.Slag handling 8. outgrowth in productivity ?Sources 1.Si: snowfall pitch and gangue in oxide feed 2.S : with ampere-second 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 poop favour low silicon live metal.(also high abstract pressure implies less(prenominal) boudard reaction thusly less carbon sack thus lesser coke rate) The input used e.g. sinter and conjure ore have little contro l on the destiny Al2O3 in slag which makes the slag viscous and sulphur broadcast from metal to slag difficult. (higher alumina implies higher the viscosity of slag) Sulphur- 80% to 90% in slag, 10% to 15% in flue dust, 2% to 5% in HM Silicon Coke burns in BF running region in presence 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. consequently SiO vapour is unstable, and the silicon monoxide feature thus generate! d 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 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 buncombe as, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a affluent essay, order it on our website: OrderCustomPaper.com

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