Waste selective catalytic reduction (SCR) catalyst as a hazardous waste has a significant impact on the environment and human health. In present study

a novel technology for thermal treatment of waste SCR catalyst was proposed by adding it to sinter mix for iron ore sintering. The influences of coke rate on the flame front propagation

sinter microstructure

and sinter quality during sintering co-processing the waste SCR catalyst process were studied. In situ tests results indicated the maximum sintering bed temperature increased at higher coke rate

indicating more liquid phase generated and higher airflow resistance. The sintering time was longer and the calculated flame front speed dropped at higher coke rate. Sinter microstructure results found the coalescence and reshaping of bubbles were more fully with increasing coke rate. The porosity dropped from 35.28% to 25.66%

the pore average diameter of large pores decreased from 383.76 μm to 311.43 μm. With increasing coke rate

the sinter indexes of tumbler index

productivity

and yield

increased from 33.2%

9.2 t·m

-2

·d

-1

28.9% to 58.0%

36.0 t·m

-2

·d

-1

68.9%

respectively. Finally

a comprehensive index was introduced t

o systematically assess the influence of coke rate on sinter quality

which rose from 100 to 200 when coke rate was increased from 3.5% (mass) to 5.5% (mass).