Dvořák Karel, Macháčková Adéla, Ravaszová Simona, Gazdič Dominik
Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech Republic.
Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 17. listopadu 15, 708 00, Ostrava, Czech Republic.
Materials (Basel). 2020 May 13;13(10):2234. doi: 10.3390/ma13102234.
This contribution characterizes the performance of a DESI 11 high-speed disintegrator working on the principle of a pin mill with two opposite counter-rotating rotors. As the ground material, batches of Portland cement featuring 6-7 Mohs scale hardness and containing relatively hard and abrasive compounds with the specific surface areas ranging from 200 to 500 m/kg, with the step of 50 m/kg, were used. The character of the ground particles was assessed via scanning electron microscopy and measurement of the absolute/relative increase in their specific surface areas. Detailed characterization of the rotors was performed via recording the thermal imprints, evaluating their wear by 3D optical microscopy, and measuring rotor weight loss after the grinding of constant amounts of cement. The results showed that coarse particles are ground by impacting the front faces of the pins, while finer particles are primarily milled via mutual collisions. Therefore, the coarse particles cause higher abrasion and wear on the rotor pins; after the milling of 20 kg of the 200 m/kg cement sample, the wear of the rotor reached up to 5% of its original mass and the pins were severely damaged.
本论文描述了一台基于双反向旋转转子销磨机原理工作的DESI 11型高速粉碎机的性能。作为研磨材料，使用了几批莫氏硬度为6-7级的波特兰水泥，这些水泥含有相对坚硬且具有磨蚀性的化合物，比表面积范围为200至500平方米/千克，步长为50平方米/千克。通过扫描电子显微镜以及测量颗粒比表面积的绝对/相对增加量来评估研磨后颗粒的特性。通过记录热印记、利用三维光学显微镜评估转子磨损情况以及测量研磨一定量水泥后转子的重量损失，对转子进行了详细的特性分析。结果表明，粗颗粒通过撞击销钉的正面进行粉碎，而细颗粒主要通过相互碰撞进行研磨。因此，粗颗粒对转子销造成更高的磨损；在研磨20千克比表面积为200平方米/千克的水泥样品后，转子磨损量达到其原始质量的5%，销钉严重受损。
