化工学报2019，Vol.70Issue(5)：1742-1749,8.DOI:10.11949/j.issn.0438-1157.20181253
湿法磷酸固-液体系混沌混合与浸出强化行为
Solid-liquid chaotic mixing and leaching enhancement performance in phosphoric acid leaching process
摘要
Abstract
In the process of wet-process phosphoric acid leaching, the mode of action of the traditional rigid stirring paddle is mainly shearing, and it is easy to form a symmetrical flow field structure and reduce the stirring efficiency. The effects of impeller type, impeller off-bottom clearance, stirring speed, length of flexible wire, diameter of flexible wire on leaching rate and largest Lyapunov exponent (LLE) were investigated experimentally. The results showed that rigid-flexible impeller changed structure of flow field and improved the fluid chaos mixing degree through coupling interaction of rigid-flexible-fluid. At leaching time 120 min, agitation speed 225 r/min, off-bottom clearance h=T/4, diameter of wire d=0.42r and length of wire L=1.3T, LLE of rigid-flexible impeller reached 0.9071 and leaching rate of phosphate rock increased by 10.8%. At the same power consumption (Pv=9860 W/m3), the suspension uniformity and the slag phosphorus content were reduced by 40.8% and 17.67% with the rigid-flexible impeller, respectively. In addition, the morphology of the crystal was improved when the rigid-flexible impeller was used. Meanwhile, the filtration performance of phosphogypsum was enhanced.关键词
湿法磷酸/刚柔组合桨/两相流/浸取/结晶/最大Lyapunov指数Key words
wet-process phosphoric acid/rigid-flexible impeller/two-phase flow/leaching/crystallization/largest Lyapunov exponent分类
化学化工引用本文复制引用
李兵,杨义,刘作华,陶长元,谷德银,许传林,王运东..湿法磷酸固-液体系混沌混合与浸出强化行为[J].化工学报,2019,70(5):1742-1749,8.基金项目
国家重点研发计划项目(2017YFB0603105) （2017YFB0603105）
国家自然科学基金项目(21576033,21621636004) （21576033,21621636004）
国家科技支撑计划项目(2015BAB17B01) （2015BAB17B01）
中央高校基本科研业务费专项资金(106112017CDJQJ228808) （106112017CDJQJ228808）
重庆市科技创新领军人才支持计划项目(CSTCCXLJRC201703) （CSTCCXLJRC201703）
