北京科技大学学报Issue(7)：867-874,8.DOI:10.13374/j.issn1001--053x.2014.07.003
生物质木炭用于鲕状高磷铁矿除磷
Phosphorus removal of oolitic high-phosphorus iron ore using biomass char
摘要
Abstract
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 experi-ments 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 met-allization 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 sili-cate 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 further-more, metal with the phosphorus content of less than 0. 3% could be obtained after introducing 2% to 4% Na2 CO3 into the melting sys-tem. Based on the above analysis, the feasibility of applying biomass char for phosphorus removal is demonstrated.关键词
铁矿石/脱磷/生物质/直接还原Key words
iron ores/phosphorus removal/biomass/direct reduction分类
矿山工程引用本文复制引用
唐惠庆,范立强,马龙,郭占成..生物质木炭用于鲕状高磷铁矿除磷[J].北京科技大学学报,2014,(7):867-874,8.基金项目
国家自然科学基金资助项目(51144010) （51144010）
钢铁冶金新技术国家重点实验室开放基金资助项目(416020020) （416020020）
