Backfilling mined cavities in coal mine - uses water absorbent waste material and mineral material, swelling on contact with water

摘要

The backfilling of mined cavities in a coal mine uses waste, as stowing material, stored in the open air and susceptible to water absorption. During and after filling, and during the placing of the stowing material, a dry mineral material is added to hinder water circulation, as it is subject to swelling when in contact with water. ADVANTAGE - Facility for using also water absorbent waste.