Composite additive for spraying coal into blast furnace

Abstract

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.

Description

technical field [0001] The invention relates to a composite additive, which is used to improve the combustion performance of blast furnace coal injection, and can improve the utilization rate of secondary resources such as metallurgical ash and slag, and belongs to the technical field of metallurgy. Background technique Blast furnace coal injection is an important measure to reduce coke consumption and increase blast furnace operability. Since the pulverized coal stays in the combustion area of ​​the tuyere of the blast furnace for a short time, as the amount of coal injection increases, unburned pulverized coal will accumulate in the furnace, thereby reducing the air permeability of the blast furnace, destroying the airflow / temperature distribution in the furnace, and affecting the forward movement of the blast furnace . Catalytic combustion is a method of adding a small amount of additives based on the chemical reaction principle of coal combustion without changing the ...

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Problems solved by technology

At present, the main ingredients of blast furnace coal injection additives are mostly a variety of chemical products, such as the patent CN02133147.2 blast furnace coal injection combustion aid contains 5~10% LiCO 3 and 3~12% B 2 o 3 and other components, which increase the complexity and cost of the proces