Abstract: The ironmaking process of oxygen top-blown smelting reduction from high phosphorus iron ore mixed with ilmenite was studied. The experiments were conducted to investigate the effects of slag basicity, temperature, molar ratio of carbon to oxygen, oxygen-blowing time, holding time and oxygen flow rate on iron recovery rate. The experimental results showed that the iron recovery rate increased with increasing of smelting temperature, content of CaO added, molar ratio of carbon to oxygen, oxygen-blowing time, holding time and oxygen flow rate within a certain range. The slag and iron were well separated and iron recovery rate was up to 96.17% under the conditions of holding time of 30 min at 1500℃, slag basicity of 1.3, molar ratio of carbon to oxygen of 1.0, oxygen-blowing time of 10 min and oxygen flow rate of 350 L/h.

Key words: high phosphorus iron ore, ilmenite, smelting reduction, ironmaking

摘要： 采用氧气顶吹熔融还原法进行了高磷铁矿和钛铁矿混合矿炼铁的实验研究，考察了熔渣四元碱度、反应温度、碳氧摩尔比、通氧时间、保温时间和氧流量对炼铁效果的影响. 结果表明，提高反应温度、在一定范围内增加CaO加入量、提高碳氧摩尔比、延长通氧时间和保温时间、增加氧流量都能不同程度地提高铁还原率. 确定的合理工艺条件为：温度1500℃，碱度1.3，碳氧摩尔比1.0，保温时间30 min，通氧时间10 min，氧流量350 L/h，在此条件下渣铁分离较好，铁还原率达96.17%.

关键词: 高磷铁矿, 钛铁矿, 熔融还原, 炼铁