国内金属选矿广泛采用由温式格子型球磨机与螺旋分级机组成的闭路循环系统。由于分级机返矿口与磨机中心线的高差小只能装设笨重的联合给料器，能耗大造价高O一些选厂经过改造，成功地用效式给料器取代了联合给料器，达到了增产降耗的良好效果。1联合给料器存在的问题联合给料? Domestic metal beneficiation widely used by the warm grid-type ball mill and spiral classifier composed of closed-circuit circulation system. As the grading machine return port and mill centerline height difference can only be installed bulky joint feeder, high energy consumption and high cost of some of the dressing plant has been transformed, the successful use of feeders to replace the joint to give Feeder, to achieve a good effect of increasing production and consumption. 1 joint feeder problems combined feed?