齐放,张一敏,薛楠楠,刘涛,黄晶.搅拌器参数对钒页岩浸出罐流场的影响优化[J].有色金属(冶炼部分),2019(11):59-65.
搅拌器参数对钒页岩浸出罐流场的影响优化
Effect of Agitator Parameter Optimization on Flow Field of Vanadium Shale Leaching Tank
投稿时间:2019-06-10  修订日期:2019-06-12
DOI:doi:10.3969/j.issn.1007-7545.2019.11.013
中文关键词:  钒页岩  浸出罐  优化  数值模拟  速度场  浓度场
英文关键词:vanadium shale  leaching tank  optimization  numerical simulation  velocity field  concentration field
基金项目:国家重点研发计划(2018YFC1900505);国家自然科学基金资助项目(51804226,51774215,51774216)
              
作者单位
齐放 武汉科技大学 资源与环境工程学院
张一敏 武汉科技大学 资源与环境工程学院
薛楠楠 武汉科技大学 资源与环境工程学院
刘涛 武汉科技大学 资源与环境工程学院
黄晶 武汉科技大学 资源与环境工程学院
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中文摘要:
      搅拌浸出罐是钒页岩湿法提钒浸出段主要操作单元,但在工业生产中因浸出罐流场状态的差异存在固相分布不均、罐底矿物易沉积等问题。通过改变桨叶层数、双层桨的层间距和下层桨距底高度等手段,结合计算流体力学软件FLUENT,模拟分析不同径向测点位置与轴向测点位置颗粒的速度场与浓度场分布特点。结果表明,增加桨叶层数能够有效降低浸出罐内存在的浓度梯度,促使固液两相充分混合;双层桨层间距的增大能够缓解浸出罐上方流体速度较小问题,以“合并流”为主的层间距在0.33D~0.53D时,更有利于加强桨叶间区域的固液两相接触碰撞和充分混合;双层桨的下层桨叶距底高度为0.13D~0.23D时,强化了罐底颗粒的轴向速度,有效缓解矿物颗粒在罐底沉积问题。
英文摘要:
      Stirring leaching tank is main operation unit in wet leaching section of vanadium shale, but there exist some problems in industrial production, such as uneven distribution of solid phase, easy deposition at the bottom of tank for minerals and so on. By changing number of blade layers, blade layer spacing and bottom height of the lower pitch for double propeller, combined with computational fluid dynamics software FLUENT, distribution characteristics of velocity field and concentration field of particles at different radial and axial positions were simulated and analyzed. The results show that increasing number of agitator layers can effectively reduce concentration gradient in leaching tank and promote full mixing between solid and liquid. Increasing double blade layer spacing can alleviate problem of lower fluid velocity upper part of leaching tank. The layer spacing at 0.33D~0.53D is mainly "merging flow", which is more beneficial to strengthen contact collision between solid and liquid phase and full mixing in the region between blades. When the height of the lowest blade of double propeller is 0.13D~0.23D, the axial velocity of particles at bottom of tank is strengthened, so as to effectively alleviate problem of mineral particles deposition at the bottom of tank and promote effective dispersion of solid particles.
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