机械动能磨制备硬质高岭土微粉的工艺参数研究

Study on Process Parameters of Hard Kaolin by Mechanical Energy Mill

为了避免高岭土在传统的湿法和普通机械磨超细粉碎过程中引入大量其他杂质,从而造成高岭土纯度降低,研究采用绵阳流能粉体设备有限公司的LNI-330A型机械动能磨对高岭土进行超细粉碎。在分级机转速为1 087 r/min,粉碎主机转速为120 m/s,系统风量为5 400 m3/h,二次风量为465 m3/h,主气流流量为3 523 m3/h情况下,最大产量为397 kg/h,激光粒度分析和扫描电镜分析表明,高岭土微粉的d50<4μm,呈现结构有序和形貌定型化的特征。

The purity of kaolin powder is decreased due to a lot of introduced other impurities by traditional wet treatment technology and mechanical wear in general ultrafine preparation process. In order to avoid above conditions, the Mianyang Liuneng Powder Equipment＇s mechanical energy mill （LNI-330A type） was used to prepare ultrafine kaolin powder in this experiment under the condition of dry type. Through the orthogonal experiment, the optimum condition： the classifier speed is 1 087 r/min, the grinding speed of main engine is 120 m/s, the total system air volume is 5 400 m3/h, the secondary air flow of second stage classifier is 465 m3/h, the main stream flow is 3 523 m3/h. Under this condition, the production yield of kaolin powder is 397 kg/h. The analysis of laser particle analyzer and scanning electron microscope shows that the particle size （ d50 ） of kaolin powder is lower than 4 μm, the ordered microstructures and morphology stereotyping of kaolin powder are formed.