| China is rich in rare earth resources,with largest reserves and production in the world.Rare earth elements have been widely used in various fields,known as "industrial vitamins",and have become extremely important strategic resources.In rare earth separation enterprises,the solvent extraction method is commonly used to separate and extract single rare earth elements from mixed rare earth symbiotic ore.In order to obtain rare earth products with high purity,it is necessary to use a mixed clarification tank for multi-level step extraction.Difficult-to-extract and easy-to-extract rare earth components are obtained from the outlet of aqueous phase and the outlet of organic phase respectively.It is necessary to determine the optimal process parameters of the rare earth cascade extraction process when rare earth separation enterprises develop a new process,reorganize the existing rare earth extraction processes and re-optimize the process parameters.On the basis of the cascade extraction theory,and the unremitting efforts of many experts,great achievements have been obtained in the design and production of rare earth separation process in China.However,there are still a series of problems,for example,when developing a new process,technicians usually use small-scale model tests to determine process parameters,resulting in a great waste of human and material resources;When the working conditions of the production process change,it is still necessary to adjust the process parameters with the help of workers’ experience,which leads to the instability of the quality of export products,and has become a bottleneck restricting the development of China’s rare earth industry.On the basis of the mechanism model based on the theory of relative separation coefficient,considering the extraction efficiency of the extraction tank,this paper introduce the correction value of separation coefficient to realize the expansion of the mechanism model of rare earth extraction.What’s more,combined with the actual working conditions on the industrial site,the optimization design of the rare earth cascade extraction process of the multi-component two-export system is studied,and the optimized design system of the rare earth cascade extraction process is established to realize the optimal process parameter design and process simulation of the rare earth extraction process.The specific research content is as follows:1.The cascade extraction process technology is described,and the mechanism model of the rare earth extraction and separation process is analyzed.The formulas for the parameters of the rare earth extraction process are listed.The theory,realize the calculation of process parameters,and combine the example to optimize the design of the La Ce/Pr Nd extractionproduction line of a rare earth separation company,and give the optimal process parameters;2.The dynamic simulation of rare earth extraction process is realized by using the separation funnel method,and its shortcomings are analyzed.Aiming at the problem that the process simulation model based on the rare-earth extraction mechanism does not consider the extraction efficiency of the extraction tank,the content of the components at each level of the model is difficult to meet the actual industrial conditions.The mechanism model and data-driven method are combined to establish the rare earth extraction process simulation based on the correction of separation coefficient.On the basis of the mechanism model of the rare earth extraction process with the relative separation coefficient,the correction value of the separation coefficient is introduced to realize the expansion of the rare earth extraction mechanism model,the Fibonacci tree optimization algorithm(FTO)are used to optimize the correction values at all levels.Then,according to the actual industrial field data,the dynamic performance of the model in this paper is verified when the operating conditions are changed,and the results show that the simulation of the process established in this paper meets the actual operating conditions of the rare earth extraction process;3.The MATLAB GUI is used to develop a rare earth cascade extraction process optimization design system,which realizes the optimization design and extraction process simulation of the rare earth cascade extraction process according to field conditions and production indicators,and introduces the system development and design block diagram and functions of each module.To sum up,the optimization design of the rare earth cascade extraction process and the simulation of the rare earth extraction process in a multi-component two-export system are carried out,which provides important references for the establishment of new rare earth separation enterprises,the development of new processes,the reorganization of existing rare earth extraction processes,and the optimization of process parameters,greatly shorten the construction period,and improve the economic and technical indicators of the whole industry,with important practical significance. |
