Composite additive for spraying coal into blast furnace

The invention discloses a composite additive for spraying coal into a blast furnace, which comprises the following components in percentage by weight: 5-15 percent of iron ore powder, 15-35 percent of blast furnace dust, 10-30 percent of iron oxide scraps, 5-15 percent of steelmaking bulk stock dust, 5-20 percent of calcium oxide, 15-35 percent of calcium peroxide, 3-8 percent of manganese oxide and 1-5 percent of rare-earth metal oxide. The invention can effectively improve the combustion performance of coal power sprayed into the blast furnace and the combustion rate of the coal powder at an air opening and reduce unburnt coal power content, has the advantages of simple and convenient production process and adding way, easy acquisition of raw materials, low cost and recycling of beneficial components, basically does not change the traditional equipment and changes waste materials into things of value, and more than 50 percent of components are by-products in metallurgic production.