在处理含有小于0.5％cu和0.2％Ni的贫硫化矿石中,必然导致提高选矿设备处理能力超过1000吨/日。曾经制造和应用的大容积直流型浮选机,根据实践经验,这类机械的结构是可行的。近来试图制定浮选过程的相似标准,如果弗鲁德标准Fr=idem,那末对于具有几何相似的两台浮选机中的水-空气两相系 In the treatment of lean sulphide ores with less than 0.5% cu and 0.2% Ni, this inevitably leads to an increase in processing equipment capacity of over 1000 tons / day. Once the manufacture and application of large-capacity DC flotation machine, based on practical experience, the structure of such machinery is feasible. Recently, a similar standard for the flotation process has been attempted, and if the Frud standard Fr = idem, then for water-air two-phase systems in two flotation machines of similar geometry