吕家坨矿矸石破碎系统破碎能力低、能耗高，生产中还存在厂房振动大、设备故障率高等问题。为有效解决上述问题，吕家坨矿将矸石破碎工艺由“先破后筛”改进为“先筛后破”，并将一级破碎机由颚式破碎机更换为分级破碎机。优化改造后，系统破碎能力提升了67.74%，破碎能耗降低了67%，堵塞故障频次减少了75.4%，有效减少了检修维护工作量。吕家坨矿矸石破碎系统的优化改造实践可为其他企业矸石等硬岩物料破碎系统设计改造提供有益参考。

The issues existing in the LYUjiatuo Mine′s crushing system involve low crushing capacity, high energy consumption, large plant vibration and high failure rate of equipment. In order to solve the above problems, the gangue crushing process of first crushing and then screening originally applied by the mine is switched to a process that puts screening ahead of crushing, and the sizing crusher is used in place of the primary raw crusher. With the use of the renovated system, there has been seen a rise of crushing capacity by 67.74%, a drop of power consumption for crushing by 67%, reduction of risks of blocking of crusher by 75.4%, an effectively reduction of maintenance workload. The renovation work made may provided a useful reference for the design and transformation of the crushing system for hard rock materials such as gangue.