摘要
研究机械活化对高钙钒渣的物化性质及酸浸提钒的影响。采用X射线衍射仪(XRD)、扫描电镜(SEM)、激光粒度分析仪(LPSA)、比表面积测试仪(BET)、红外分析(FTIR)等检测方法,分析不同活化时间高钙钒渣的物相结构、表观形貌、粒度和比表面积的变化规律。同时考察了不同活化时间高钙钒渣的钒浸出率,当活化30 min后,与未活化相比,钒的浸出率增加了约10%。研究结果表明,机械活化不仅能使高钙钒渣的粒度变小和比表面积增大,还使钒渣的物相结构发生一定的变化。主要表现为硫酸钙等物质衍射峰强度随活化时间的延长先增高后降低,间接表明了这些物质随着活化时间的延长先被释放出来而后又被包裹起来,从而影响了钒的浸出率。最后也研究了不同浸出时间高钙钒渣浸出率的变化,在H;SO;浓度200 g·L^(-1)、固液比1∶10 g·ml^(-1)、反应温度120℃、反应时间60 min、搅拌速度300 r·min^(-1)条件下,高钙钒渣的钒浸出率可达82.15%。
The high-calcium vanadium slag was the tailings after calcification roasting and acid leaching.The tailings contained 1%~3%vanadium,which had great utilization value.At present,Chinese and foreign scholars had done a lot of researches on the mechanical activation of minerals,the purpose of which were to change the occurrence state of minerals,increase their leaching activity,and improve the utilization rate of minerals.Therefore,this study used this as a basis to investigate the changes in phase,apparent morphology,particle size and specific surface area of the high-calcium vanadium slag after mechanical activation for different time.At the same time,the vanadium leaching rate of high calcium vanadium slag with different activation time was also investigated.The high-calcium vanadium slag used in the experiment was from Jiuyuan County,Sichuan Province.After crushing,ball milling,sieving and drying,the material with a particle size of less than 75μm was used as the experimental raw material.In each mechanical activation test,80 g high-calcium vanadium slag and 800 g steel balls were added to the ball milling jar.The particle size of the steel balls was 10 and 12 mm,and the ratio of the two particle size steel balls was 1∶1.And then the ball mill jars were symmetrically put into planetary ball mill.The ball mill speed for all batch experiments was 250 r·min^(-1).The activation time of the high-calcium vanadium slag was respectively 5,15,30,45,60 min.After the high-calcium vanadium slag was mechanically activated,50 g of the activated sample and 500ml of 200 g·L^(-1)H_(2)SO_(4)were added to the zirconium reactor,and then the mixed slurry was reacted at 120℃for 30 min.After the leaching residue was analyzed,it could be calculated that the vanadium leaching rate of the activated sample was 82.15%.Compared with the vanadium leaching rate of the unactivated sample,it was increased by about 10%.After the high-calcium vanadium slag was mechanically activated for different time,the results of X-ray diffraction(XRD)a
作者
瞿金为
张廷安
牛丽萍
吕国志
张伟光
陈杨
Qu Jinwei;Zhang Tingan;Niu Liping;Lv Guozhi;Zhang Weiguang;Chen Yang(Key Laboratory for Ecological Utilization of Multi-Metal Intergrown Ores of the Ministry of Education,School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2021年第12期1472-1479,共8页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51874094)
中央高校基础研究基金项目(182504018)资助
关键词
高钙钒渣
机械活化
浸出率
high calcium vanadium slag
mechanical activation
leaching rate
