Abstract:Traditional flotation equipment relies on inertial collision mechanisms and faces problems such as poor selectivity, low recovery rates, and poor foam mobility when processing fine-grained minerals, making it difficult to meet the requirements for efficient utilisation. Based on this, this paper proposes a new high-energy mechanical stirring flotation machine aimed at the efficient recovery of fine-grained minerals, which overcomes the limitations of conventional mineralisation mechanisms based on the design concept of strong turbulence constraint optimisation. Through the study of the flow field characteristics of a 30L strong constraint flotation machine, combined with experimental validation, the flow field characteristics under different impeller Reynolds numbers were systematically analysed. The results show that within the range of average impeller Reynolds numbers of 3.1×10?–4.6×10?, as the rotational speed increases, a clear triple circulation flow field is formed in the tank, the degree of back mixing is enhanced, and the gas phase distribution is more uniform; the turbulence kinetic energy and turbulence dissipation rate in the impeller-stator region are significantly enhanced, effectively increasing the probability of bubble-particle collisions; the internal tank structure significantly enhances the mixing intensity in the lower region, and the impeller circulation and internal tank circulation increase with rotational speed, reaching optimal circulation matching at Re’=4.2×10?. The study confirms the applicability and superiority of the strong turbulence constraint design for the flotation of fine-grained minerals, providing a theoretical basis and technical pathway for the development of high-performance flotation equipment.