提钒尾渣加压碱浸提钒的基础研究

Basic Study on Extraction of Vanadium by Pressurized Alkali Leaching from Vanadium Extraction Tailings

针对提钒尾渣中钒的回收与利用,提出碱法加压浸出提钒工艺,从而实现提钒尾渣中钒的浸出与提取。进行了原料分析并考察了浸出过程中温度、氢氧化钠浓度、反应时间、液固比和搅拌转速对尾渣中钒、铬、硅的浸出率的影响。结果表明,在温度120℃、氢氧化钠用量10%、液固体积质量比4~6 mL/g、时间1 h、搅拌转速400 r/min的条件下,钒的浸出率可控制在50%,同时尽量减少了铬与硅的浸出,保持溶液的净化程度,为后续的萃取提钒工艺提供很好的溶液条件。

In view of the recovery and utilization of vanadium from vanadium extraction tailings,the alkaline pressure leaching technology was proposed to realize the leaching and extraction of vanadium from vanadium extraction tailings.The raw material was analyzed and the effects of temperature,sodium hydroxide concentration,reaction time,liquid-solid ratio and stirring speed on the leaching rate of vanadium,chromium and silicon in the tailings were investigated.The results indicate that the leaching rate of vanadium can be controlled at 50%when the temperature is 120℃,the dosage of sodium hydroxide is 10%,the liquid-solid ratio is 4-6 mL g,the time is one hour,and the stirring speed is 400 r min.At the same time,the leaching of chromium and silicon is reduced as much as possible.The purification degree of the solution is maintained,and good solution conditions are provided for the subsequent extraction of vanadium.