1Research on Effects and Extent of Grinding Aid Agent in Wet Uitrafine Grinding of MineralDing Hao1-52Dispersion Behaviors of Hydrophilic and Hydrophobic Particles in WaterRen Jun, Lu Shouci6-93Magnification of Super-fine Powder Jet Classifier and Reserarch on Its FlowField DistributionZheng Shaohua, Tao Zhendong, Liu Futian, Jiang Fenghua10-134New Ideas of Powder Technology and Cement IndustryHan Zhongqi14-155Application and Market Prospects of Rotary Crusher with Dould CavitySun Chenglin16-206Progress of Research on Structure and Shape Control of Powder Made by Wet ChemistryLi Qihou, Xiao Songwen, Liu Zhihong21-247New Progress in Preparation Technique of Ultrafine M-type Barium Ferrite PowdersXiao Qi, Qiu Guanzhou, Zhang Qingcen, Huang Suping25-288Dust Explosion Risk Analysis and Protections for Bulk GrainHandling Equipment in HarborsS.Radandt, F.hauert, Li Gang, Deng Xufan, Yang Baogui, Jin Baoxiang, Chen Guodong, Zhan Haian, Wang Jiasheng, Li Yongqing29-329Application of Rolling Mill to Powder Engineering(Ⅱ)Li Zhengyu, Liu Zhen, Li Wenwu33-36