Zhengzhou Rongsheng Kiln Refractory Co., Ltd，introduces you to the refractory materials for converters, including refractory products for converters, and uses. Welcome to inquiry and
contact us.
Converter steelmaking raw materials are scrap steel and molten iron, carbon is removed by slagging, oxygen blowing and other methods. Converter lining life varies with smelting steel species. For example, larger converter which only smelt carbon steel, has low smelting temperature and stable slag components, so its service life is much longer. But with the development of top bottom combined blowing technique, i.e., blowing N2, CO2, Ar or O2 into converter through bottom purging plug, converter smelting time is shortened, steel liquid quality is improved and smelting cost is reduced, but the corrosion to lining refractories is accelerated.
Furnace crown mainly suffers slag corrosion and air washing,
magnesia carbon bricks oxidization and mechanical damage during cleaning, so high strength and high oxidization resistant magnesia carbon bricks can be used at converter crown.
Converter trunnion area has severe slag corrosion, air washing, oxidization and mechanical stress, meanwhile, it is hard to be patched, so the best quality high strength and high corrosion resistant magnesia carbon bricks which contain 16%~18% carbon can be adopted here.
For slag line zone, where mainly suffers slag corrosion, premium high corrosion resistant magnesia carbon bricks should be used. For charging side, which not only exposes to liquid steel and slag corrosion, but also suffers iron liquid washing and scarp steel impact, therefore, high strength magnesia carbon bricks which have strong resistance to corrosion, and good resistance to thermal shock should be adopted.
Taphole main damage reasons are oxidization, slag corrosion, drastic temperature change, liquid steel washing and so on, so high strength and high oxidization resistant magnesia carbon bricks should be adopted.
To increase converter using life, lining refractories quality is one important factor, while operation condition is a more important factor. Maintenance is anther important method to promise converter service life, lining protection measures can prolong using life fore several times. Currently converter main patching and maintaining methods are the follows.
Hot self flow patching materials are mainly used at front and back large faces, gunning mix is mainly used for trunnion area and other parts.
Slag splashing protection technique. Light burned magnesia balls or dolomite can be added into converter, so the melting point and viscosity of slag can be increased, then through high pressure nitrogen blowing, light burned magnesite and dolomite containing slag is splashed to converter lining, so the corrosion to furnace lining is reduced during smelting.
Before the development of
magnesite carbon bricks, converter lining is mainly built by burned magnesite bricks or tar pitch bonded magnesia bricks, magnesite dolomite bricks, etc. But now, magnesite carbon bricks are more and more popularly used in converters, almost all converter linings are constructed by magnesia carbon bricks. Converter permanent lining is built by magnesia bricks, jointing materials are magnesia ramming mass.
