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近几年来,在烧结料中配加一定量的含镁熔剂,使烧结矿MgO含量维持在2.5—3.0％,已在高炉冶炼中取得了良好的效果。增加烧结矿MgO含量,可以提高软化温度,减小高炉炉渣粘度受炉温波动的影响。因此,含MgO物料已成为烧结料中必不可少的添加物。包钢使用的含镁物料和全国大多数厂家一样,是白云石。由于包头铁精矿含SiO_2低,为保证烧结矿强度和高炉内造渣的需要,烧结料中要配一定量的高硅矿粉,使SiO_2维持在7.0—7.5％左右。
In recent years, adding a certain amount of magnesia flux in the sinter to maintain the content of MgO in the sinter at 2.5-3.0% has achieved good results in blast furnace smelting. Increasing the content of sinter MgO can increase the softening temperature and reduce the influence of furnace temperature on the viscosity of blast furnace slag. Therefore, the MgO-containing material has become an indispensable additive in the sintering material. Magnesium Baotou used materials and most of the manufacturers, dolomite. Due to the low SiO_2 content in Baotou iron ore concentrate, a certain amount of high-silicon ore powder should be used in sintering materials to keep the strength of sinter and the need of making slag in the blast furnace so as to keep the SiO_2 at about 7.0-7.5%.