带支体萃取法工艺参数最优化研究

Branch-current involved extraction (BCE) process is another advanced extraction method developed by our country since the three-outlet extraction process. As an important progress in the solvent extraction technique, BCE process can simultaneously obtain three highly-purified products with high yield and low consumption, thus has become an advanced rare-earth extraction technology of our country on the international stage. However, the problem to be urgently solved is to develop a processing parameter optimization and calculation method for BCE process. A couple of branch-currents are involved in the BCE process; thus processing parameter optimization is much harder for the BCE process comparing with the three-outlet extraction process, and no optimization formula is ever developed for the BCE process. Herein, a novel investigative method will be used to study the optimization theory of the EBC process. Basic experimental investigation and data analysis for the EBC process is made at first. Then, equations between technological parameters are found out with mathematical modeling, formula derivation and computer calculation. The studying on the optimization of EBC process is of important scientific value, clear application prospect and wide application areas; especially an important significance to the use of rare-earth and non-ferrous metals resource in jiangxi province.

带支体萃取法是我国继提出三出口萃取工艺后，又率先研发的一种先进萃取分离工艺。带支体萃取法工艺可同时获得三种高纯产品，产品直收率高、成本低消耗小、分离效率好。已经成为我国稀土萃取分离领先国际同行的先进技术。带支体萃取法工艺面临的关键科学问题是如何设计计算其最优化工艺参数。带支体萃取法与三出口相比，多了一个或二个支体工艺，所以它的工艺参数间关系比三出口工艺复杂得多，是个复杂体系。目前还没有提出类似于分馏萃取、三出口工艺的工艺参数最优化方程。本课题寻找新的路径，通过基础实验研究及数据分析，采用优选法，数据建模，数学推导运算和辅以计算机，找出工艺参数间的新关联，建立创新的带支体萃取法工艺参数最优化方程。本课题的研究对我国率先开发的带支体萃取法工艺优化发挥出更好的经济效益和保持实现世界领先的工业工艺水平具有重要意义，有明确工业应用背景。尤其对江西稀土和有色金属等优势资源利用有重要的应用前景。

带支体萃取法工艺是继我国率先研发三出口萃取工艺后，又首创的一种先进萃取分离工艺。带支体萃取法工艺可同时获得三种高纯产品，产品直收率高、成本低消耗小、分离效率好。是我国稀土溶剂萃取技术的重要进展之一，已经成为我国稀土萃取分离领先国际同行的先进技术。建立带支体萃取法工艺最优化理论是带支体萃取法工艺亟待解决的关键科学问题。与三出口萃取工艺相比，带支体萃取法工艺多了一个或二个支体工艺，因而增加了多个工艺参数和多个分离指标。工艺参数间关系复杂，工艺优化是个复杂难题。带支体萃取法工艺优化方程理论未见报道。还没提出类似于分馏萃取、三出口工艺的最优化方程。本课题总结实验研究和大量文献实验资料，对该工艺深入基础研究。对以水相进料三出口主体工艺洗涤段引出水相带一个支体的带支体萃取法工艺，成功建立了整体优化工艺的最优化萃取量方程和分步优化方法及其最优化萃取量方程，并推导出带二个支体的带支体萃取法工艺的最优化萃取量方程。还推导出以水相进料主体工艺萃取段引出有机相带一个支体的带支体萃取法工艺的最优化萃取量方程。解决了带支体萃取法工艺参数最优化问题，使工艺流程有更好的分离效率，达到更高、更先进的技术经济指标。可指导试验研究，减少盲目性，缩短研制周期。为工业生产提供最优化工艺参数，并为萃取生产的在线控制提供理论依据。串级萃取最优化理论是串级萃取理论的重要内容。带支体萃取法工艺可广泛用于稀土、有色金属、稀有金属、核燃料等萃取分离领域。本课题带支体萃取法工艺参数最优化研究具有广阔的应用领域，对带支体萃取法工艺和串级萃取理论都有重要的科学意义。江西拥有世界罕见的离子稀土矿特色资源和丰富有色金属资源，本课题研究对江西省稀土及有色金属等优势资源开发利用具有重要的应用前景。