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achieved addition alumina analysis ASTM index bell-less top bentonite blast furnace blast humidity British Steel Corporation bulk density bunkers calcium carbide CaO/SiO2 ratio carbon carryover chemical chute coke and CaO/SiO2 coke content coke rate desulphurization distribution drying effect equipment factors feed ferrite flow flowrate fuel rate gases gravity charging heat hematite high top pressure hopper hot coal hot metal hot-metal silicon improved increase injection iron ironmaking ladle large bell Llanwern lower LTBT index magnesia magnetite manganese method mineralogy moisture obtained operation output oven packed bed pelletizing plant permeability pig iron practice preheated coal problem properties raw mix reducibility rotating sealing valve shaft shown in Fig sinter plant sinter quality sinters containing slag slag volume soda ash specific steel steelmaking sulphur sulphur content sulphur levels temperature thermal tion top gas tuyere variables variation voidage wet coal