摘要
以江西某地石煤为原料，采用直接酸浸－萃取－反萃－沉钒－煅烧的工艺进行萃余液循环利用实验，对石煤提钒萃余液循环利用过程中V浸出率、V萃取率，萃取现象，V205产品质量与萃余液循环次数之间的关系及杂质元素Al，K，Ca，Mg，Fe，Si在萃余液循环利用过程中的行为进行了研究。研究表明：萃余液的循环利用对V浸出率、V萃取率，萃取现象及V：05产品质量的影响不大，在萃余液循环利用过程中，V的浸出率在92％～94％之间波动，V的一级萃取率在75％～78％之间波动，萃取现象正常，V2O5产品的品位始终大于98％；萃余液未循环时，浸出液中的Al，K，Ca已饱和，过饱和的Al，K以KAl（SO4）2（H2O）12的形式析出进入浸出渣中，过饱和的Ca以CaS04的形式析出进入浸出渣中，使得萃余液循环过程中浸出液、萃原液、萃余液中Al，K，Ca的含量在第一次循环时急剧增加，随后增加趋势减缓，最终保持稳定；浸出液、萃原液、萃余液中Mg，Fe的含量随萃余液循环次数的增加逐渐累积，累积至一定程度后趋于稳定；浸出液、萃原液、萃余液中Si的含量在萃余液循环利用过程中基本不累积。
The stone coal obtained from a certain area of Jiangxi in China was used as raw materials. The experiments of raffinate recycling utilization were carried out with a process of direct acid leaching, solvent extraction, stripping, vanadium precipitation and calcining. The relationships of the leaching efficiency of vanadium, extraction rate of vanadium, extraction phenomenon and the product quality of V205 with the cycle times of raffinate were studied. And the behavior of impurity elements （e. g. Al, K, Ca, Mg, Fe, Si） in the process of raffinate recycling utilization was also investigated. The results showed that the leaching efficiency of vanadium, ex- traction rate of vanadium, extraction phenomenon and the product quality of V205 were not remarkably affected by utilization of the re- cycled raffinate. In the process of the raffinate recycling utilization, the leaching efficiency of vanadium fluctuated between 92%- 94% , the first extraction rate of vanadium fluctuated between 75%~ 78%, the extraction phenomenon kept normal and the rates of the product of V205 were always above 98%. During raffinate recycling, the contents of Al, K and Ca in the leaehate, the extraction con- centrate or the raffinate increased sharply when the raffinate was recycled for the first time, and then the tendency slowed down, finally, the contents of Al, K and Ca kept stable, this phenomenon was all for that the contents of Al, K and Ca in the leachate were saturated before recycling the raffinate, the supersaturated Al and K precipitates in the leaching residue were in the form of KAI（ S04 ）2 （H：O）~2and the supersaturated Ca precipitated in the leaching residue was in the form of CaSO4. At the same time, the contents of Mg and Fe trended to be stable after gradually circulated to a certain degree. And the content of Si was basically unchanged all the time.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第6期952-960,共9页
Chinese Journal of Rare Metals
基金
国家科技部"十二五"科技支撑计划重点项目(2011BAB05B01)资助
关键词
石煤
萃余液
萃取
循环利用
stone coal
raffinate
extraction
recycling utilization
