Abstract:Innovations of mining technologies were proposed by beneficial utilizations of unfavorable factors such as high geostress, high geotemperature and high mining depth to achieve green mining as mining depth increases inevitably. Cuttability of deep hard rock was investigated by experimental and regressed analyses to find the reasonable stress adjustment method to improve non-explosive mechanized fragmentation for hard ore-rock. A non-explosive mechanized and intellectualized mining method was proposed to continuously and precisely exploit phosphate underground, which promoted the high-recovery, low-waste and high-efficiency exploitation of phosphate with recovery rate over 90%, dilution rate near 5% and cutting efficiency about 107.7 t/h. A circular economy model and the backfill system were proposed to conduct resource utilizations of solid waste, by which the utilization amount of waste increased year after year. In 2018, the utilization amounts of phosphogypsum, yellow phosphorus slag and waste rock increased to 1853.6×10³ t/a, 291.1×10³ t/a and 1493.8×10³ t/a, respectively.

Key words: hard rock mine; non-explosive mining; waste backfilling; circular economy; waste utilization; green mining