复杂铌矿高温还原熔炼-炉渣冷却结晶富集铌试验  

Selective Enrichment of Niobium in Complex Ore by Reduction Smelting and Cooling Crystallization of Slag

作　　者：任国兴[1] 肖松文 李家林[1] 彭泽友[1] 冉孟杰 陈雯[1] REN Guo-xing;XIAO Song-wen;LI Jia-lin;PENG Ze-you;RAN Meng-jie;CHEN Wen(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)

机构地区：[1]长沙矿冶研究院有限责任公司,湖南长沙410012 [2]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《矿冶工程》2021年第4期79-83,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金重大研究计划重点支持项目(92062223)。

摘　　要：针对白云鄂博铁铌稀土复杂多金属矿中铌矿相种类多、性质差异大、难以利用的难题,提出了复杂铌矿高温还原熔炼-炉渣控温冷却定向结晶富集铌新工艺,考察了碱度(CaO/SiO_(2)比值)、铁还原率、冷却速度对渣中富铌矿相粒度、形貌与组成的影响。结果表明,铌主要富集于铈铌钙钛矿相,碱度是影响结晶矿相组成的关键因素,而铁还原程度不影响结晶矿相组成。降低冷却速度可以有效提高富铌矿相粒度。Up to now,it is still difficult for the niobium resource in the Bayan Obo complex polymetallic ore to be effectively utilized due to the existence of a great variety of phases of niobium minerals and quite different Nb properties.Aiming at such problem,a combined processing technique consisting of high-temperature reduction smelting of complex niobium ore and cooling crystallization of slag was proposed to transform various Nb-bearing minerals into a type of Nb-bearing phase,which is beneficial to Nb extraction.The effects of basicity(CaO/SiO_(2) ratio),the reduction degree of Fe and cooling rate on the grain size,compositions and micro-structure of Nb-bearing phase in the obtained slag were investigated in detail.It is found that the Nb in the slag exists mainly in the form of loparite;the basicity(CaO/SiO_(2) ratio)is the key factor affecting the composition of crystalline phase of mineral,but the reduction degree of Fe has no effect on the composition of crystalline phase of mineral;a lower cooling rate is beneficial for increasing the grain size of Nb-bearing phase.

关 键 词：白云鄂博 稀土矿 铌 还原熔炼 含铌炉渣 结晶生长 

分 类 号：TF111[冶金工程—冶金物理化学]