脱碳渣热态返回脱磷炉再利用的研究

Research on dephosphorization converter utilizing hot returned steel slag of decarburization converter

为实现＂全三脱＂工艺少渣冶炼,进一步降低半钢辅料消耗,首钢京唐钢铁联合有限责任公司进行了脱磷炉采用脱碳渣热态直接返回利用工艺。对热态脱碳渣的脱磷能力及可回收性进行了分析,并研究了热态渣对脱磷炉成渣工艺的影响及在脱磷炉中的应用效果。结果表明：每炉回收热态渣10~15t,可节约石灰1.6~2.4t,若铁水w（Si）〈0.15%,脱磷炉可不加石灰,钢铁料消耗相应减少2.4kg/t,并且可取消萤石及轻烧石灰的使用。脱磷炉采用回吃热态脱碳渣工艺后,终点磷含量与常规处理几乎相同,同时可利用转炉渣中的显热,降低热量损失。

In order to achieve less slag of＂Full-Tri-de＂smelting process,new technology which was study on dephosphorization converter using recycling of hot steel slag of decarburization converter was employed to further reduce material consumption of semi steel smelting process by Shougang Jingtang.The dephosphorizing ability and recyclability of hot steel slag of decarburization converter were analysised.Simultaneously,the effect of hot steel slag on slag forming path and application effects in dephosphorization converter were investigated.The results show that average consumption of 1.6-2.4t lime was saved through recycling hot steel slag 10-15 tper ladle.If silicon mass fraction in molten iron is lower than 0.15 %,lime could not be added to dephosphorization furnace.The consumption of2.4kg/t iron and steel raw material was correspondingly cut.Meanwhile,light-burned dolomite and fluorite as burden materials were eliminated in dephosphorization furnace.The end-point phosphrous content was almost the same with the normal operation after adopting recycling of hot steel slag of decarburization converter.At the same time,the heat loss could be reduced by using sensible heat of converter hot slag.