一、前言包钢在钢铁冶炼上面临着几个问题,例如:第一,若高炉采用高碱度操作,高炉结瘤的问题虽可解决,但铁水含硫量势必增高;第二,要解决转炉冶炼时间长、生产率低的状况,必须设法降低铁水的含磷量;第三,铁水中的铌必须更有效地进行回收。通过国内外的研究结果表明;碳酸钠系(苏打)熔剂能够有效地脱除铁水中的磷、硫、铌,并能从生成渣中去回收铌。加之,包钢所处的内蒙 I. INTRODUCTION Baotou Steel faces several problems in the iron and steel smelting. For example: First, if the blast furnace adopts the high alkalinity operation, the problem of the nodule formation in the blast furnace can be solved, but the sulfur content of the molten iron is bound to increase; secondly, Converter smelting a long time, the production rate is low, we must try to reduce the phosphorus content of hot metal; third, the niobium in hot metal must be more effective recovery. The research results at home and abroad show that sodium carbonate (soda) flux can effectively remove phosphorus, sulfur and niobium from molten iron and can recover niobium from the generated slag. In addition, Baotou Steel is located in Inner Mongolia