Sintered composite additive agent

The invention relates to a sintering composite additive which comprises: 1.0 to 2.5 percent by weight of sodium nitrate, 0.5 to 1.5 percent by weight of sodium carbonate, 0.2 to 0.5 percent by weight of cerous nitrate, 1.0 to 1.5 percent by weight of borax and 95.3 to 96 percent by weight of water. The sintering composite additive needs to be diluted by 10 times when in use and the liquid mixture additive benefits even blending with coke powder and can highly disperse and absorb on the surfaces and in the pores of the coke powder to efficiently catalyze the combustion process; the sintering composite additive overcomes the defects that solid additives requires complex facilities such as an ore trough, a weighing machine and a belt conveyer, etc., provides convenience in the application and can be directly sprayed on the thin layer coke powder of large sinter feed belts without any modification to the existing production process. In addition, the sintering composite additive contains no chlorine elements and p