目前,国内绝大多数选厂是采用单一的水力分级设备对物料进行分级的。其分级过程是按颗粒在水介质中的沉降规律进行,当有用矿物与脉石矿物比重差较大时,物料按粒度分级的精确度降低,导致分级效率较低。为了提高分级效率,增加磨机处理能力,马鞍山矿山研究院于1981年研制了φ400mm实验室型立式圆筒筛。在此基础上,又研制成功φ1m中型和φ2m工业型立式圆筒 At present, the vast majority of domestic select plants adopt a single hydraulic grading equipment to classify the materials. The grading process is based on particles in the water medium settlement law, when the useful minerals and gangue mineral gravity difference is larger, the grading accuracy of the material by grading, resulting in lower classification efficiency. In order to improve the classification efficiency and increase the mill capacity, Ma On Shan Institute of Mining in 1981 developed a φ400mm laboratory vertical cylindrical sieve. On this basis, the successful development of φ1m medium and φ2m industrial vertical cylinder