The second stage of Zhuzhou filling industrial pump was in the 1970s and 1980s, when tailings cemented filling technology was applied. Due to the lack of self-supporting ability of non cemented filling materials, it was difficult to meet the needs of high recovery rate and low dilution rate in mining technology. So after the development and promotion of water sand filling technology, cemented filling technology began to be adopted. During this period, the fine sand bonding filling materials mainly used tailings, natural sand, and sandblasting as filling aggregates, with cement as the bonding agent. The third stage is since the 1990s, with the rapid development of the mining industry, the original filling process can no longer meet the requirements of the mining process and further reduce mining costs or environmental protection needs. Therefore, new technologies such as high concentration filling, paste filling, waste rock bonding filling, and full tailings bonding filling have been developed Overview of the use of backfill mining method in foreign countries株洲充填工业泵工业充填泵  第二阶段是2O世纪70年代、80年代，开始应用尾砂胶结充填技术，由于非胶结充填体无自立能力，难以满足采矿工艺高回采率和低贫化率的需要。所以在水砂充填工艺得以发展并推广应用后，开始采用胶结充填技术。这一时期的细砂胶结充填料主要以尾砂、天然砂和棒磨砂等作为充填集料，胶结剂为水泥。   第三阶段是20世纪90年代以来，随着采矿工业的迅速发展，原充填工艺已不能满足回采工艺的要求和进一步降低采矿成本或环境保护的需要。因而发展了高浓度充填、膏体充填、废石胶结充填和全尾砂胶结充填等技术新。．国外充填采矿法的使用概况