中文摘要：

针对难处理的鲕状高磷铁矿,提出了首先采用高气化性生物质木炭制备含碳球团,然后通过直接还原-高温熔分的方法,成功实现了该铁矿的除磷提铁.直接还原实验采用管式炉.考察了还原温度、生物质木炭加入比例（碳氧摩尔比）和气氛等条件对样品还原行为的影响,并确定了适宜的还原条件为温度1373 K、配碳量0.9、时间15～25 min以及气氛PCO2/PCO =1：1.在此条件下,样品的金属化率和残碳质量分数分别在75%～80%和0.69%～0.11%的范围内.通过对该金属化球团的X射线衍射和扫描电镜-能谱分析发现：还原后样品中的主要物相为金属铁、磷灰石和硅酸三钙；磷没有被还原而仍以磷灰石的形式存在于脉石中.高温熔分实验采用Si-Mo棒高温箱式炉.实验结果得到磷质量分数为0.4%的铁样.在熔分体系中进一步添加相对质量为2%～4%的Na2CO3,可以得到磷质量分数在0.3%以下的铁样.基于以上分析,证明了采用生物质木炭用于高磷铁矿的除磷提铁是可行的.

英文摘要：

A method of phosphorus removal was proposed to process oolitic high-phosphorus iron ore. It is an integration of direct reduction and melting separation with carbon-containing pellets prepared with high-reactivity biomass char. Direct reduction experiments were performed in a tubular furnace, and three parameters were investigated, i. e. , reduction temperature, biomass char adding ratio （ carbon-to-oxygen molar ratio） and atmospheres. The optimum condition was determined to be the reduction temperature of 1373 K, the biomass adding ratio of 0. 9, the PCO2/PCO value of 1：1, and the reduction time of 15 to 25 min. Under this condition, the metallization rate and the residual carbon content of reduced samples are 75% to 80% and 0. 69% to 0. 11%, respectively. SEM-EDS and XRD examination of reduced samples obtained under the optimum condition shows that the major phases are metallic iron, calcium silicate and calcium phosphate, but phosphorus still remains in gangue. Subsequent melting separation experiments were conducted in a Si-Mo high-temperature furnace. Metal with the phosphorus content of some 0. 4% was obtained from the reduced samples;and furthermore, metal with the phosphorus content of less than 0. 3% could be obtained after introducing 2% to 4% Na2 CO3 into the melting system. Based on the above analysis, the feasibility of applying biomass char for phosphorus removal is demonstrated.