Improving the efficiency of fine grinding of materials in a new inverted impact grinder with enhanced energy-technological performance

Abstract

An analysis of methods and equipment for fine material grinding was conducted, confirming the effectiveness of free impact and high-speed impact grinders. A novel inverted impact grinder with an innovative operating scheme is proposed, enhancing energy input and improving particle size classification. A simplified mechanical-mathematical model is introduced, enabling numerical determination of particle stress, grinding thresholds, impact velocity, force, and other key parameters. An engineering methodology is developed for calculating the required number of impacts and grinding time to reach the target particle size, predicting size changes, and regulating process parameters. Refined theoretical dependencies and graphical models support the determination of optimal operating conditions. The proposed model allows for estimating the operational performance of the grinder and selecting rational working parameters for the new grinder. Comparative experimental studies confirm the grinder’s operability, advantages, and increased efficiency. The findings show that the new operating scheme enhances performance and expands grinding capabilities. The system enables controlled particle disintegration, reducing energy consumption while producing finer particle sizes. The novel design and working principles present considerable potential for further development and optimization, potentially enabling ultrafine material grinding. The study establishes a foundation for future research on fine and ultrafine grinding, exploring new possibilities for cost-effective industrial applications.