论文部分内容阅读
采用耦合传质的格子Boltzmann方法模拟风化壳淋积型稀土矿中稀土浸出的溶质传递过程,在验证模型有效性的前提下,获得了稀土矿填充孔隙中流体流动的速度分布和伴随流动过程的溶质浓度分布.通过考察浸取流速对溶质传递过程的影响,得到最佳浸取流速,约为0.25～0.35 mm/s,使溶质传递效率最高.浸取流速小于0.2 mm/s导致浸取周期过长、浸取剂消耗量大;浸取流速大于0.4 mm/s引起沟流,导致稀土不能有效地浸出.此外,模拟所得传质舍伍德数Sh随雷诺数Re的变化关系与经验关系式吻合,表明提出的模型可用于预测稀土浸出过程的溶质传递规律.
The coupled mass transfer lattice Boltzmann method was used to simulate the solute transfer process of rare earth leaching in weathering crust rare earth deposits. The validity of the model was validated to obtain the velocity distribution and the accompanying flow processes The solute concentration distribution was investigated by investigating the influence of the leaching rate on solute transport.The optimum leaching rate was 0.25-0.35 mm / s and the solute transfer efficiency was the highest.The leaching rate was less than 0.2 mm / s, which led to the leaching cycle Too long, the consumption of leaching agent is large; when the leaching velocity is more than 0.4 mm / s, the channeling is caused, which leads to the rare earth can not be effectively leached.In addition, the relationship between the mass transfer Schrödinger number Sh and the Reynolds number Re and the empirical relation The results show that the proposed model can be used to predict the solute transport in rare earth leaching process.