近年来我矿进入选厂的原生矿大大增多,原矿仓格筛上大块的破碎工作量相应增加。为减轻操作同志的体力劳动,提高生产效率,我矿于1975年8月,在南京凤凰山铁矿的大力支援下,在省冶金设计院的帮助下,制作安装了一台GP-80风动二次破碎机,使用至今,效果良好。过去,每班破大块的人员有时达到三、四人之多, In recent years, the mine has greatly increased the number of primary mines entering the beneficiation plant, resulting in a corresponding increase in the amount of crushing work on the bulk of the ore warehouse. In order to alleviate the manual labor comrades to improve production efficiency, I mine in August 1975, with the strong support of Nanjing Fenghuang Mountain Iron Ore, with the help of the Provincial Metallurgical Design Institute, produced and installed a GP-80 wind Secondary crusher, use so far, the effect is good. In the past, the class of people who broke large chunks sometimes reached as many as three or four people,