Silicon and Sulhur Control in Hot Metal

Control of Si-S in onslaught Furnace ? thrill Furnace 1.Productivity 2.Coke rate 3. character of HM ?Advantages of throe Si-S in HM 1. slight warming required to smother SiO2 in BF 2.Cost reduction in steel making 3.Less slopping tendency (directly proportional to Si content in HM) 4. commix refractory consumption 5.Oxygen consumption 6.Less tap time 7.Slag handling 8. increase in productivity ?Sources 1.Si: snowfall deepen and gangue in oxide feed 2.S : with ascorbic acid in form of CaS and FeS Sulphur enters the furnaces done coke and due to naughty coke rate in our furnaces, it is difficult to maintain basicity at the desired level. High draw pressure in Blast Furnaces can favour wretched te hot metal.(also high top pressure implies less(prenominal) boudard chemical reaction thereofly less century loss therefore lesser coke rate) The input use e.g. sinter and conjure ore go for little control on the percentage Al2O3 in slag which makes the slag viscous and randomness transfer from metal to slag difficult. (higher alumina implies higher the viscousness of slag) Sulphur- 80% to 90% in slag, 10% to 15% in flue dust, 2% to 5% in HM Silicon Coke burn in BF running expanse in comportment of tuyeres thus releasing coke ash tree containing SiO2.

SiO evaporation forms by the succeeding(a) 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, and the silicon monoxide feature thus generated at the time of coke combustion in front of the tuyeres further reacts with carbon of the move metal droplets in the region between the bosh and the residence and beat ups reduced and transferred as silicon in the hot metal, agree to the following reactions: SiO (g) + [C] ? [Si] + CO (g) Or by decomposition as, 2SiO (g) ? SiO2 (g) + [Si] otherwise proposed reaction, (FeO) + SiO (g) ? [Fe] + (SiO2) In hearth,...If you indigence to get a full essay, distinguish it on our website: Ordercustompaper.com

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