湖南磷化工总厂直径30m的周边移动式浓缩机，原用于浓缩一200目含量为95％以上浮选后的精矿，现用于浓缩一100目含量90％以上的分级机溢流普钙。由于矿粒变粗，沉降速度加快，当矿浆从浓缩机中心给人时，经常造成底流管堵塞。严重时，用风管吹散矿位也无济于事，只得用人工从地 Hunan Phosphorus Chemical Plant diameter of 30m peripheral mobile thickener, used to concentrate a 200 mesh content of more than 95% of the flotation concentrate, is now used to concentrate a 100 mesh content of more than 90% of the grading machine overflow calcium. As ore particles coarsen and settle faster, when the slurry is given from the center of the concentrator, the underflow tube is often blocked. In serious cases, it is of no avail to blow the mine off with the air duct, only to use artificial ground