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Exploitation of slag obtd. from steel-making converters - where molten slag is mixed with fly ash and silica, and reduced in arc furnace to make casting powder
Exploitation of slag obtd. from steel-making converters - where molten slag is mixed with fly ash and silica, and reduced in arc furnace to make casting powder
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机译:矿渣的开发。来自炼钢厂的转炉-将熔渣与粉煤灰和二氧化硅混合,然后在电弧炉中还原成铸粉
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The slag obtd. during the refining of molten iron is mixed, pref. while molten, with fly ash from coal burning power stations; schist or coal shale; scrap contg. SiO2 and Al2O3; and/or molten blast furnace slag. Silica or sand is next added so the ratio Al2O3/SiO2 is max. 0.17; and the mixt. contains 30-70%, esp. 40-70% SiO2. The mixt. is kept molten via a burner, and is then reduced in an electric arc furnace with C reducing agents, followed by granulation in water, but recovering the reduced metals by decantation. Fluxes may be added to the mixt., e.g. CaF2, alkalies, Li2O and/or B2O3. The granulate is pref. milled to below 50 microns size. The milled prod. is employed as a casting powder, or as a constituent of such powder, used on the molten metal in the mould of a continuous casting plant.
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