高磷鲕状赤铁矿直接还原同步脱磷新脱磷剂李永利.pdfVIP

第 43 卷第 3 期 中南大学学报( 自然科学版) Vol.43 No.3 2012 年 3 月 Journal of Central South University (Science and Technology) Mar. 2012 高磷鲕状赤铁矿直接还原同步脱磷新脱磷剂 李永利，孙体昌，徐承焱，刘占华 (北京科技大学 金属矿山高效开采与安全教育部重点实验室，北京，100083) 摘要：为开发高磷鲕状赤铁矿，采用直接还原焙烧的方法对含 TFe 品位为43.58% ，磷含量 0.83% 的鄂西某宁乡式 高磷鮞状赤铁矿进行系统研究。通过 X 线衍射仪(XRD)和扫描电镜(SEM)对提铁降磷机理进行研究。研究结果表 明：在配合使用NCP 和新脱磷剂 TS 2 种脱磷剂的条件下，可以获得 TFe 品位为91.35%、铁回收率为 85.12%、 磷含量为 0.081% 的直接还原铁粉。原矿加入脱磷剂焙烧后，含磷矿物的物相并没有发生变化，仍以氟磷石的形式 存在，通过细磨磁选实现提铁降磷。加入的脱磷剂有助于破坏鲕状结构，使金属铁颗粒与脉石颗粒的接触面变得 平滑、清晰，改善高金属铁和脉石的解离条件，同时脱磷剂还能促进中间产物铁橄榄石的还原。 关键词：高磷鲕状赤铁矿；直接还原焙烧；脱磷剂；磁选；脱磷率 中图分类号：TF553 ；TD951 文献标志码：A 文章编号：1672−7207(2012)03−0827−08 New dephosphorizing agent for phosphorus removal from high-phosphorus oolitic hematite ore in direct reduction roasting LI Yong-li, SUN Ti-chang, XU Cheng-yan, LIU Zhan-hua (State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China) Abstract: In order to exploit high-phosphorus oolitic hematite, Phosphorus removal in direct reduction roasting of the Ningxiang type high phosphorus oolitic hematite with iron content about 43.58%, phosphorus content about 0.83% was studied. XRD and SEM were used to analyze the mechanism of direct reduction roasting and phosphorus removal. The results show that the direct reduction iron powder with an iron grade 91.35%, 85.12% in recovery, phosphorus content about 0.081% is obtained under the condition that dephosphorizing agent NCP and new dephosphorizing agent TS is used together. It is found that phosphate phase has