... self-diffluent classifiers and multi-stage classifiers, are mainly used to sort materials by the combination of particle size, ... in powder materials. Specifically, air separators can be used for separating coarse materials in submicron powders and nano- ... / 68015651 Fax:(086)21-68015117Weifang Zhengyuan Powder Engineering Equipment Co., Ltd.Add:No.169,Yuqing Street,Weifang,Shandong,ChinaTel:(086) ...