(一)A型浮选机存在的主要问题 目前国内广泛使用的A型浮选机存在的主要问题是:矿浆面翻花严重,槽内有10～20％的矿液面为无泡沫层,以致使刮板不能全部刮出泡沫。浮选槽内的充气量随着叶轮盖板的磨损而迅速降低,如表1所示。浮选机内的充气量一般只达到0.5～0.6米~3/米~2·分,井且进气量受给矿量的影响较大。粗、细矿物容易产生分层,并使底部积砂,电能消耗也大。 A型浮选机为了能形成足够的真空度,往往要求叶轮转速较高,叶轮与盖板径向与轴向间隙要求严格。由于高的叶轮转速会加剧叶轮与盖板的磨损,使它们之间的空隙加 (A) the main problems of A-type flotation machine At present, the main problems of the A-type flotation machine widely used in China are: serious over-flow of pulp surface, 10-20% of the liquid surface in the tank is a non-foam layer, So that the scraper can not all scratch the foam. Flotation tank inflatable volume with the impeller cover quickly decreased, as shown in Table 1. Flotation flotation machine generally only reached 0.5 ~ 0.6 m ~ 3 / m ~ 2 · min, well and the amount of air intake to a greater impact on the amount of ore. Coarse, fine minerals are prone to delamination, and the bottom of the sand, power consumption is also large. Type A flotation machine in order to form a sufficient degree of vacuum, often require high impeller speed, impeller and cover radial and axial clearance requirements are strict. As the high impeller speed will exacerbate the impeller and cover wear, so that the gap between them plus