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By R. V. Williams

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3. T h e oxidation of silicon by iron and manganese oxides in the slag as the iron droplets pass through the slag layer. 4. T h e desulphurization of metal droplets as they pass through the slag layer. There are three reaction equilibria of primary importance: S i 0 2 + 2C = Si 4- 2 C O , M n O + C = Mn + C O , C a O + S + Ç = CaS + C O , where the underscore indicates elements dissolved in iron. 44 The blast furnace and its control T h e processes for Si may be simplified as follows: Zone Chemical behaviour Si level Very low Bosh Fe Tuyere Gangue - Slag Slag-*— Hot metal reservoir Fe + 4%C Si Si •Metal 3-4% -Metal Reducing to 1-2% 1-2% 13 W e can see from this simplified version of recent papers by Decker and S c i m e r , Tsuchiyer 14 and T u r k d o g e n 12 that ( a ) the silicon level in the hot metal varies up to 3% or thereabouts in the bosh, but that ( b ) silicon is 'leached-out' as metal droplets pass down the slag.

T h e model can perform burden and slag calculations including certain useful predictions about slag chemistry. It will, for example, calculate the slag weight and analysis to be expected from a particular burden, including the sulphur partition. A l s o , if the required slag composition is input, then the necessary weight and analysis of one of the burden components can be calculated, such as a flux addition to a burden consisting of acid pellets and sinter. T h e ease with which the combined oxygen can be removed from different ores, pellets and sinters can be measured by simple laboratory techniques to give a figure for the burden's reducibility.

This gas reacts with coke to form C O ( 1 0 0 % ) . 3. This then reduces F e O to F e , . . and so on up this region of the furnace. 2) recorded by Cavaghan and W i l s o n . Thermal reserve zone A b o v e the 1200 Κ (927°C) isotherm, the coke gasification reaction, C02 ( g) 4- C ( S) - > 2 C O ( g ), markedly slows but the reduction of Wustite takes place instead: C O ( g) + F e O ( s) - > F e ( s) + C 0 2 . ( g ) A s this reaction is only slightly exothermic, the gases cool slowly above the 1200 Κ level.

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