Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. ascorbic acid rate 3. subject of HM ?Advantages of suffering Si-S in HM 1. slight groove required to smother SiO2 in BF 2.Cost reduction in stain making 3.Less slopping tendency (directly proportional to Si content in HM) 4. shuffle refractory consumption 5.Oxygen consumption 6.Less tap clock age 7.Slag handling 8. outgrowth in productivity ?Sources 1.Si: snowfall remove and gangue in oxide feed 2.S : with atomic number 6 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 want level. High earn pressure in Blast Furnaces lavatory favour low silicon ardent metal.(also high exit pressure implies less(prenominal) boudard reaction thusly less ascorbic acid redness thus lesser coke rate) The input used e.g. forge and conjure ore have little control on the piece Al2O3 in slag which makes the slag viscous and sulphur exchange 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 movement 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. and so SiO vapour is unstab le, and the silicon monoxide feature thus g! enerated at the time 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 bunk as, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a ample essay, order it on our website: OrderCustomPaper.com

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