An integrated and efficient process for borax preparation and magnetite recovery from soda-ash roasted ludwigite ore under CO–CO_(2)–N_(2) atmosphere  

作　　者：Jinxiang You Jing Wang Mingjun Rao Xin Zhang Jun Luo Zhiwei Peng Guanghui Li 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第11期2169-2181,共13页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2020YFC1909803);the Basic Science Center Project for the National Natural Science Foundation of China(No.72088101);the Graduate Research and Innovative Project of Central South University(No.506021739)。

摘　　要：To realize the comprehensive utilization of ludwigite ore,an integrated and efficient route for the boron and iron separation was proposed in this work,which via soda-ash roasting under CO–CO_(2)–N_(2) atmosphere followed by grind-leaching,magnetic separation,and CO_(2) carbonation.The effects of roasting temperature,roasting time,CO/(CO+CO_(2))composition,and Na_(2)CO_(3) dosage on the boron and iron separation indices were primarily investigated.Under the optimized conditions of the roasting temperature of 850℃,roasting time of 60 min,soda ash dosage of 20 wt%,and CO/(CO+CO_(2)) of 10 vol%,92%of boron was leached during wet grinding,and 88.6%of iron was recovered during the magnetic separation and magnetic concentrate with a total iron content of 61.51 wt%.Raman spectra and^(11)B NMR results indicated that boron exists asB(OH)_(4)^(-) in the leachate,from which high-purity borax pentahydrate could be prepared by CO_(2) carbonation.

关 键 词：ludwigite ore soda-ash roasting CO-CO_(2)-N_(2)atmosphere BORAX 

分 类 号：TD981[矿业工程—选矿]