5.7　Sinter Sizing

5.7.1　The process of sinter sizing and screening out hearth layer shall be adopted for sintering plant design.

5.7.2　The sinter sizing process flow shall be determined according to the construction site，sinter properties and blast furnace requirements，etc..When the content of sinter bigger than 50mm is less than 10%，the cold sinter crushing equipment should not be adopted，only three-stage cold screening process is adopted and vibrating screen should be adopted as screening equipment.The sizing of on-strand cooled sinter may be determined according to actual conditions.

5.7.3　When it is necessary to use cold sinter crushing equipment，double spiked roll cruhser shall be adotped，and four-stage cold sinter screening process shall be adopted.The primary screen shall be of fixed screen and the rest shall be of vibrating screens，and the automatic de-ironing device shall be installed before cold sinter crushing.

5.7.4　The particle size of product sinter should be 5-150mm without cold sinter crushing，the content of sinter bigger than 50mm should be less than or equal to 8%，and the content of sinter smaller than 5mm should be less than or equal to 5%.The particle size of sinter should be 5-50mm with cold sinter crushing，the content of sinter bigger than 50mm should be less than or equal to 5%，and the content of sinter smaller than 5mm should be less than or equal to 5%.

5.7.5　The particle size of hearth-layer material should be 10-20mm.

5.7.6　The particle size of return fines should be smaller than 5mm.

5.7.7　The sinter sizing system should be equipped with standby series or standby screening equipment according to actual conditions.