Oxygen blast furnace iron-making method based on cold-bonded carbonic pellet

Abstract

An oxygen blast furnace iron-making method based on cold-bonded carbonic pellet belongs to the blast furnace iron-making field. The oxygen blast furnace iron-making method based on cold-bonded carbonic pellet is characterized in that 70 to 100 percent of carbonic pellet and 0 to 30 percent of sintered ore are adopted as materials for iron-making and added to a blast furnace from the top of the blast furnace; coke and coal injection are adopted as fuel of the blast furnace, wherein each ton of iron consumes 200 to 250kg/t HM of coke; the carbon content of the carbonic pellet is 1 to 20 percent and TFe content is 50 to 65 percent; mean compressive strength of the carbonic pellet is 1000 to 2000N/each; the carbonic pellet is subjected to an automatic reduction process in the blast furnace so as to change gas-phase partial pressure of reduction reaction and reduce coke load of the blast furnace; simultaneously, oxygen of normal temperature is injected through a blast-furnace tuyere to displace the traditional air heating furnace; the applied amount of oxygen is 200 to 500 Nm/t HM; coal gas with high heating value (7000 to 8000KJ/Nm) can be provided outward by the blast furnace, and the coal gas generated by the blast furnace can be recycled after going through a dust-removing and pre-heating device and then is respectively injected into the blast furnace from the blast-furnace tuyere and the lower part of the blast furnace body; the theoretical combustion temperature of the method provided is controlled to be between 1900 and 2300 DEG C; and the coke ratio of the oxygen blast furnace iron-making method can be reduced to 200 to 250 kg/t HM, and the coal ratio is above 200 to 300 kg/t HM.

Description

technical field [0001] The invention belongs to the field of blast furnace ironmaking. Specifically, it is an oxygen blast furnace ironmaking process in which oxygen is used instead of blast furnace hot air, and cold-solidified carbon-containing pellets are used as part or all of the iron-containing raw materials of the blast furnace. Background technique [0002] At present, the molten iron produced by traditional blast furnace ironmaking process accounts for more than 90% of the world's total pig iron. The pulverized coal is injected at 100-200kg / tHM, and the hot air is sent to the blast furnace through the hot blast stove. The air temperature is generally controlled at 1000-1300°C, and the blast oxygen enrichment rate is 0-5%. For the traditional blast furnace ironmaking process, a large amount of expensive metallurgical coke is used, and the high energy consumption, high pollution, high cost and the resulting shortage of coke resources in the coking process have become ...

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Problems solved by technology

For the traditional blast furnace ironmaking process, a large amount of expensive metallurgical coke is used, and the high energy consumption, high pol

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