The development and practice of new quick-setting filling materials prepared by total industrial wastes

Traditional paste filling materials adopt industrial solid wastes such as unclassified tailings and waste rocks aggregates, but the binder used is dominantly commercial cement, which raises cost. Hemihydrate phosphogypsum (HPG) one of main by-products phosphorus chemical industry, high-efficiency utilisation technology HPG has been a problem worldwide. The potential gelling property found in laboratory at first. It then modified by appropriate physical methods to produce new with purpose replacing cement completely. A lot experiments show that (MHPG) outstanding properties quick setting (setting time less than 90 minutes), high early strength (UCS for three days more 8 MPa) good flowability (yield stress 50 Pa). In addition, MHPG can bind different aggregates according needs prepare homogeneous, non-settling, non-bleeding paste. past years, two mines Guizhou, China have adopted underground backfill surface open pit cemented based on materials. practice, this reduces material cost 30%, increases flow capacity 50%, rate 98% compared traditional methods.