Abstract: The development background， application scope， and separation principle and technical characteristics of ZQS periodic high gradient magnetic separator，which is special equipment for non-metallic ore purification，was introduced. The reasons for three questions of the high loss rate of concentrate， cracking of the rib plate of the vibration plate， and hydrops in the coil cavity were analyzed.The overall cost of the equipment is increased very little with optimizing the structure of the upper and bottom magnetic poles， enhancing the rigidity of the vibration plate， and making holes in the bottom plate of the coil cavity， which successfully solved the problems in the use of equipment and improved the performance of the equipment at the same time. Three optimized designs were applied to the design of the ZQS-1 000 high gradient magnetic separator and the prototype was tested in a quartz sand factory in Guangdong. Vibration ribs has no cracking， the concentrate loss rate was low， and the coil cavity had no water accumulation. Under the conditions of the feeding containing 0.0184% Fe2O3 and a processing capacity for 25.59 t/h， the quality of quartz sand is of Fe2O3 0.007 4% and meets the raw material iron contents requirements of photovoltaic glass quartz sand.

Key words: ZQS periodic high gradient magnetic separator, Loss rate, Cracking, Water accumulated, High-purity photovoltaic glass