Study on preparation and performance of phosphogypsum based filling materials
In order to improve the comprehensive utilization of phosphogypsum and achieve large-scale consumption of phosphogypsum,the preparation research of phosphogypsum based filling materials using phosphogypsum,fly ash and cement as raw materials is conducted.The effects of filling material mass fraction,phosphogypsum content and fly ash content on the fluidity,rheological properties,bleeding rate,setting time and unconfined compressive strength of the filling materials are investigated.Based on the working performance,strength and economic indicators of the filling materials,the optimized ratio is 75％mass fraction of the filling material,75％content of phosphogypsum and 20％content of fly ash.Under this ratio,the flow ability is 205 mm,the bleeding rate is 4.5％,the setting time is 3 days,and the strength of the hardened body after 28 days is 4.1 MPa,which can fully meet the working performance of the filling material and the mining filling strength.
phosphogypsum based filling materialspreparationrheological propertiesbleeding rate
NETL
NSTL
万方数据
