5.6　Sinter Cake Cooling

5.6.1　Off-strand cooling should be adopted for sinter cooling.For limonite or siderite，on-strand cooling may also be accepted.

5.6.2　Forced-air circular cooler should be adopted for large-scale and medium-scale sinter machines.When it is difficult to arrange a forced-air circular cooler，the straight line forced-air cooler may also be considered.

5.6.3　The air leakage rate of the circular cooler should be less than 10%.

5.6.4　Size grading and segregated distributing technology should be adopted for the cooler，and the feeding depth of the forced air circular cooler should be 1400 mm-1500mm.

5.6.5　When the forced air cooling mode is adopted，the ratio of cooling area to sintering area should be 0.9-1.2.When the on-strand cooling mode is adopted，the ratio of cooling area to sintering area should be 0.9-1.0.

5.6.6　The cooling air volume of the updraft cooler should be selected at 2200-2500m3 per ton of sinter，and the cooling time should be 60min.

5.6.7　The average temperature of sinter unloaded from the cooler shall be less than 150℃.

5.6.8　The hot waste gas of the cooler shall be utilized，and the hot waste gas utilization rate should be more than 40%.