Method for increasing waste gas circulation sintering utilization coefficient and sintered ore barrate strength

The present invention relates to a sintered ore sintering process. A method for increasing a waste gas circulation sintering utilization coefficient and a sintered ore barrate strength in the present invention comprises: under existing sintering production process conditions, mixing sintering machine tail part heat waste gas with a temperature of 100-400 DEG C and ring cooling machine heat waste gas with a temperature of 100-400 DEG C during sintering; adding a certain amount of air or oxygen after mixing, wherein oxygen content in the circulating gas is maintained to 17-21%; conveying the mixed heat waste gas to the surface of the sintering machine material layer to be used for hot air sintering, wherein a temperature of the mixed heat waste gas is controlled to 80-400 DEG C; and concurrently reducing a ratio of a solid fuel during material preparation. According to the present invention, when waste gas circulation sintering is adopted, content of the added quick lime is increased, wherein a control range is 65-95%; a material lay thickness is correspondingly adjusted according to the content of the used quick lime CaO, wherein a material layer thickness control range is 450-950 mm; and sintered solid fuel consumption and waste gas emission can be substantially reduced, and a sintering utilization coefficient and a sintered ore strength can be increased.