SiO_(2)对高磷鲕状赤铁矿碳热还原过程中铁磷物相转变规律研究  

Study on Phase Transformation of Iron and Phosphorus by SiO_(2)during Carbon Thermal Reduction of High-phosphorus Oolitic Hematite

作　　者：齐冰力 路明 何志军[1] 张媛媛[1] QI Bingli;LU Ming;HE Zhijun;ZHANG Yuanyuan(College of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Dagushan Pelletizing Plant of Anshan Iron and Steel Group Co.,Ltd.,Anshan 114051,Liaoning,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]鞍山钢铁集团有限公司大孤山球团厂,辽宁鞍山114051

出　　处：《矿产保护与利用》2022年第5期95-103,共9页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金项目(51874171);辽宁省项目(XLYC2002064)。

摘　　要：为了明确高磷铁矿在碳热还原过程中磷相进铁的行为,以碳热还原工艺为基础,研究了高磷铁矿在不同还原温度下含磷相进铁的反应过程。结果表明:在不同还原条件下,还原过程中发生了多种物相转变,如氧化铁的还原、氟磷灰石的分解以及脉石相的转变,当SiO_(2)存在时,含磷矿物还原温度降低,磷元素更易进入铁中,两者交织溶蚀,难以分离;且随着还原温度的升高,铁中的磷含量逐渐增加并呈不规则分布。SiO_(2)的加入对含磷矿物还原有一定促进作用,SiO_(2)与氟磷灰石分解产物磷酸三钙和氧化钙反应,降低了氟磷灰石还原温度,促进了氟磷灰石分解,从而使还原出的磷元素大量进入铁中。本研究为高磷铁矿铁磷分离提供了理论基础,对高磷鲕状赤铁矿的开发利用具有一定的指导意义。In order to clarify the behavior of phosphorus phase entering iron phase in the process of carbon thermal reduction of high phosphorus iron ore,the reaction process of phosphorus phase entering iron at different reduction temperatures was studied based on carbon thermal reduction process.The results showed that under different reduction conditions,a variety of phase transitions take place in the reduction process,such as reduction of iron oxide,decomposition of fluorapatite and gangue phase transformation.When SiO_(2)exists,the reduction temperature of phosphate minerals decreases,and phosphorus is more likely to enter iron,which is difficult to separate.With the increase of reduction temperature,the phosphorus content in iron gradually increases and presents irregular distribution.The addition of SiO_(2)can promote the recovery of phosphate minerals to a certain extent.SiO_(2)can react with the decomposition products of fluorapatite,tricalcium phosphate and calcium oxide,which reduces the reduction temperature of fluorapatite and promotes the decomposition of fluorapatite,so that a large number of reduced phosphorus elements enter iron.This study provides a certain theoretical foundation for the separation of high phosphorus iron and iron phosphorus,and has certain guiding significance for the development and utilization of high phosphorus iron ore.

关 键 词：高磷铁矿 SiO_(2) 碳热还原 物相转变 氟磷灰石 

分 类 号：TD951.1[矿业工程—选矿] TD91