褐铁矿直接还原熔分制备珠铁研究

Production of Iron Nuggets Using Limonite by Direct Reduction

采用包头地区某褐铁矿粉和无烟煤粉为主要原料配制含碳球团,通过高温直接还原熔分制备珠铁。考察了配碳量、粒度、温度、保温时间对还原和熔分的影响。试验结果表明,温度和保温时间是直接还原和融分效果的主要影响因素。球团配碳量nC/nO=1.1,褐铁矿粉和煤粉粒度为小于0.048 mm(-320目)在1 370℃保温时间为5 min,所得产物还原率高,渣铁分离效果好,并且分离的渣能够自然粉化,有利于进一步筛分得到高品质的珠铁,产品可以作为炼钢原料。

Using limonite and anthracite mined in Baotou region as main raw materials to manufacture pellets containing carbon which is used to produce iron nugget by direct reduction technique.The impacts of nC/ nO,particle size,temperature and heating time on the reduction and melting has been investigated.The analysis of experimental results was carried out.The results showed that temperature and holding time strongly influenced the direct reduction and melting process.When the pellets with nC/ nO= 1.1,limonite and anthracite particle size less than 0.048 mm（320 mesh） was held at 1 370 ℃ for 5 min,slag and iron nuggets could be separated well,and the reduction rate of product was high.The separated slag can be readily pulverized.The iron nuggets can be used as a kind of steelmaking feed.