钒铬渣锰盐焙烧酸浸过程中钒、铬的分离行为  

Separation of vanadium and chromium from vanadium-chromium slag by manganese salt roasting

作　　者：温婧 姜涛 余唐霞 孙红艳 周密 WEN Jing;JIANG Tao;YU Tang-xia;SU Hong-yan;ZHOU Mi(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《中国有色金属学报》2021年第4期977-983,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51574082,51604065)。

摘　　要：本文针对目前钒铬渣中钒铬组元难以实现高效环保分离的研究现状,以钒铬渣为研究对象,碳酸锰为焙烧添加剂,通过钒铬渣碳酸锰焙烧−酸浸工艺实现了钒铬的高效分离。通过正交试验设计研究碳酸锰加入量、焙烧温度、恒温时间和升温速率对钒铬浸出行为的影响。结果表明:焙烧过程中钒尖晶石与碳酸锰的分解产物Mn_(2)O_(3)结合生成酸溶性的焦钒酸锰Mn_(2)V_(2)O_(7),随后在浸出过程中进入液相。而铬与铁结合生成稳定的固溶体(Fe_(0.6)Cr_(0.4))_(2)O_(3),浸出后转移入渣相。当碳酸锰加入量(以n(MnO)/n(V_(2)O_(5))计)为2.0,焙烧温度为850℃,恒温时间为2 h,升温速率为5℃/min时,钒浸出率达到最大值89.37%,铬浸出率仅为0.10%,实现钒的高效提取与钒铬分离。In view of the current research status that it is difficult to separate vanadium and chromium from vanadium chromium slag with high efficiency and environmental protection,vanadium-chromium slag was taken as the research object,and manganese carbonate was used as the roasting additive to achieve the high-efficiency separation of vanadium and chromium by manganese carbonate roasting-acid leaching process.The effects of manganese carbonate content,roasting temperature,holding time and heating rate on the leaching behaviors of vanadium and chromium were studied by orthogonal test design.The results show that,in the roasting process,vanadium spinel combines with the decomposition product of manganese carbonate,Mn_(2)O_(3),to form the acid soluble Mn_(2)V_(2)O_(7),and then enter the liquid phase after leaching.The stable solid solution(Fe_(0.6)Cr_(0.4))_(2)O_(3) is formed by the combination of chromium and iron,which is transferred into the slag phase after leaching.The leaching rate of vanadium reaches the maximum of 89.37%when the addition amount of manganese carbonate(n(MnO)/n(V_(2)O_(5))is 2.0,the roasting temperature is 850℃,the holding time is 2 h and the heating rate is 5℃/min.At the same time,the leaching rate of chromium is only 0.10%,realizing the efficient extraction of vanadium and separation of vanadium and chromium.

关 键 词：钒铬渣 锰盐焙烧 酸浸 分离 

分 类 号：TF11.31[冶金工程—冶金物理化学]