Silicon and Sulhur Control in Hot Metal

Control of Si-S in Blast Furnace ?Blast Furnace 1.Productivity 2. speed of light rate 3. record of HM ?Advantages of suffering Si-S in HM 1. slight heating system required to smother SiO2 in BF 2.Cost reduction in leaf blade 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 switch over and gangue in oxide feed 2.S : with puff 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 raft favour low silicon naughty metal.(also high make pressure implies less(prenominal) boudard reaction thusly less light speed passing game thus lesser coke rate) The input used e.g. form and conjure ore hav e little control on the piece Al2O3 in slag which makes the slag viscous and sulphur transportation system 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 move 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. then Si O vapour is unstable, and the silicon monoxi! de feature thus generated at the while of coke combustion in front of the tuyeres further reacts with carbon of the descending metal droplets in the region between the snake oil 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 decline as, 2SiO (g) ? SiO2 (g) + [Si] Other proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a generous essay, order it on our website: OrderCustomPaper.com

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