不同钙化剂对高钒渣酸浸提钒的影响

Effect of different calcification agents on vanadium extraction from high-vanadium slag by calcified roasting-acid leaching

针对传统钒渣钠化焙烧-水浸提钒工艺的不足,确定对钒渣钙化焙烧-酸浸提钒进行研究。在理论分析的基础上,本研究以高钒渣为原料,研究了钙化焙烧-酸浸提钒过程中3种钙化剂(CaSO4、CaCO3、CaO)的焙烧机理以及对提钒效果的影响。研究结果表明:钒浸出率随焙烧温度的升高先增大后减小,且在1 450K时达到最大值;钙化剂配比为100%CaSO4时提钒率最大;在目前实验室研究条件下,钒的浸出率最大可达93.53%。

Compared with the traditional technology of vanadium extraction from vanadium slag,a new process of classified roasting-acid leaching is researched in this study.Based on the theoretical analysis on the principle of calcified roasting process,the roasting mechanism and the effect of three kinds of calcification agents （CaSO4 ,CaCO3 and CaO）on vanadium extraction in the calcified roasting and acid leaching processes are investigated in which high-vanadium slag is used as raw material.Research results show that the leaching ratio of vanadium increases with the increasing of roasting temperature when the temperature is lower than 1 450 K.The leaching ratio reaches maximum at 1 450 K,and then comes down.The best calcification agent composition is 100% CaSO4 .By controlling the experimental conditions,the leaching ratio of vanadium in high-vanadium slag can reach 9 3 .5 3%.