绿色矿冶

At present, there are two common types of ternary precursor wastewater stripping and deamination processes. One is to use a distillation tower equipped with a reboiler and condenser, and inject saturated steam into the reboiler as a heat source. The other is to use a distillation tower equipped with only a condenser but no reboiler, and directly inject saturated steam from the bottom of the distillation tower as a heat source. These two processes have the problem of high energy consumption or a large amount of wastewater treatment discharged downstream. Therefore, this article proposed an optimized process route, which is to use a distillation tower with a reboiler and no condenser for ammonia distillation operation, fully utilizing the steam at the top of the distillation tower and the outlet liquid from the tower kettle for reasonable heat exchange with raw material wastewater, and the raw material liquid after heat exchange enters from the top of the distillation tower. And Aspen Plus process simulation software was used to simulate and compare the optimized process with the two traditional processes mentioned above. When modeling, ELECNRTL thermodynamic model and equivalent transformation were used to accelerate convergence. The simulation results indicate that the optimized process combines the advantages of two traditional processes, not only avoiding direct contact between steam heat sources and materials, but also reducing the amount of waste water in the ammonia tower kettle; Moreover, it fully utilizes the residual heat of the steam at the top of the ammonia distillation tower and the effluent from the tower kettle, thereby reducing the energy consumption of the entire system.