Enrichment of Nb and Ti from carbonatite pyrochlore ore via calcining-slaking followed by gravity separation  

作　　者：Shuhui Zhang Mingjun Rao Rendong Xiao Jinxiang You Guanghui Li Tao Jiang 

机构地区：[1]School of Minerals Processing&Bioengineering,Central South University,Changsha 410083,China

出　　处：《International Journal of Mining Science and Technology》2022年第3期615-626,共12页矿业科学技术学报（英文版）

基　　金：This work was supported by the Basic Science Center Project for National Natural Science Foundation of China(No.72088101);the National Key Research and Development Program of China(No.2020YFC1909800);the Hunan Provincial Innovation Founda-tion for Postgraduate(No.2021zzts0298).

摘　　要：In this work,a novel process consisting of calcining-slaking followed by gravity separation for the enrichment of niobium(Nb)and titanium(Ti)from carbonatite pyrochlore ore was proposed,validated and compared with the current mainstream flotation method.During calcining of the pyrochlore ore,within which the carbonates were transformed into lime.Subsequently,when the calcined ore was slaked,lime was transformed into hydroxide with fine particles which were amenable to gravity separation.After calcining at 900℃for 60 min,slaking at 90℃for 10 min with a liquid–solid ratio of 3:1(mL/g),approximately 40%of tailings can be removed by gravity separation,the recoveries of Nb and Ti were 94.7%and 91.0%,and the enrichment ratios of Nb and Ti were 1.61 and 1.43,respectively.The new approach exhibits high separation efficiency of carbonate gangue minerals and valuable minerals,satisfactory recoveries of niobium as well as titanium can be achieved.

关 键 词：NIOBIUM Titanium Pyrochlore ore CALCINATION Gravity separation 

分 类 号：TF823[冶金工程—有色金属冶金] TF841.6