Abstract: Blast furnace slag has high level of heat energy,which belongs to high grade waste heat resource,and is of great value for recovery.Taking blast furnace slag as heat source,air as gas quenching medium,air and water as heat exchange medium,rotary slag cooler is applied to carry out high temperature residue heat recovery experiment.The process separates granulation from waste heat recovery,greatly reducing power consumption.The effect of the proportion of texturizer,gas quenching pressure and nozzle structure on the heat recovery efficiency of the system are studied in this paper.The results show that with the increase of the proportion of the texturizer,the thermal efficiency of the system first increases and then decreases,the optimum proportion is 10%.With the increase of gas quenching pressure,the thermal efficiency of the system increases first and then decreases,and the optimum pressure is 0. 3 MPa. With the increase of the Maher number of the nozzle,the thermal efficiency of the system increases gradually,but the number of Maher is over 1.4,the growth rate slows down,and the best Maher number is 1.6.When the three experimental variables are in the best working condition,the thermal efficiency of the system can reach 52.35%.