Sustainable Mining and Metallurgy

Oslo crystallizer is a typical crystallizer commonly used in continuous industrial crystallization process, and its crystallization effect directly affects the quality of the final crystallization product. In this paper, CFD fluid simulation software was used to calculate the distribution of solid phase in the crystallizer at different heights (500mm, 700mm, 900mm, 1100mm, 1300mm, 1500mm) from the lowest point of the feed downcomer to the bottom of the crystallizer under uniform particle size. The influence of the insertion depth of the downcomer on the internal flow field of the Oslo crystallizer was obtained, and the optimal design size of the downcomer structure was determined and optimized. The results show that when the lowest point of the feed downcomer is 900mm from the bottom of the crystallizer, the Oslo cooling crystallizer can operate normally and is conducive to the discharge of high-concentration materials. Based on the simulation results, a variable diameter tube is added at the bottom of the feed downcomer. This structure can effectively improve the distribution of the flow field inside the crystallizer, increase the concentration of the discharged crystal, and provide a reference for the structural design of the Oslo cooling crystallizer.