This study aims to the industrial scale development of Bauxite Residue leaching for Scandium recovery, by optimizing a hydrometallurgy method and taking account appropriate design concepts for process intensification. Approaching the design issue either by adapting arithmetic methods, or using related software, showed inconsistent convergence, which is caused by the process particularities and non-conventional characteristics (i.e., feed flow-rates dependent on reflux ratio, hybrid of continuous and intermittent processes, etc.). Seeking also for process economic viability, typical cost-based objective functions showed to deviate from optima with a real economic sense. To deal with both challenges, necessary modeling simplification for advanced Leaching with Mineral Acids (LMA) was made, coupled with commercial economics and profit-based objective functions. Under the design aspect, additional constraints were introduced for the Pregnant Leach Solution (PLS) that were arisen from the subsequent Resin ion eXchange (RX) and the avoiding of colloidal silica gel formation. The optimized leaching resulted to the highest possible: solids-to-liquid ratio; molarity for RX-complying PLS; and temperature for acceptable [Si] (e.g., SL = 33.3 %, C_FA = 0.31 M, T_L = 32 °C, P_L = 1 atm, N = 1.01, τ_L≥1 h). Also, the developed simulation model can have expanded application for different LMA cases, and the introduced economic evaluation method is suitable for the production of various internationally traded commodities.

这项研究旨在通过优化湿法冶金方法并考虑适当的工艺强化设计概念，以工业规模开发铝土矿渣浸出以回收Scan。通过采用适应性算法方法或使用相关软件来解决设计问题，显示出不一致的收敛性，这是由于工艺的特殊性和非常规的特性（例如，进料流速取决于回流比，连续和间歇性工艺的混合，等等。）。还在寻求过程经济可行性的情况下，典型的基于成本的目标函数显示出具有实际经济意义的最优值。为了应对这两个挑战，对必要的简化了矿物酸（LMA）浸出的模型进行了简化，加上商业经济学和基于利润的目标函数。在设计方面，由于随后的树脂离子交换（RX）和避免形成胶体硅胶而对孕浸液（PLS）引入了其他限制。优化的浸出工艺可实现最高的固液比；符合RX的PLS的摩尔浓度; 以及可接受的[Si]的温度（例如，SL = 33.3％，Ç _FA = 0.31男，Ť_大号= 32℃，P_大号= 1个大气压，Ñ = 1.01，τ_大号≥1小时）。而且，所开发的仿真模型可以在不同的LMA案例中得到扩展应用，并且所引入的经济评估方法适用于生产各种国际贸易商品。