A kind of blast furnace coal-injection combustion aid and using method thereof

Abstract

The invention belongs to the technical field of metallurgical industry and discloses a blast furnace coal injection combustion improver and a use method thereof. The blast furnace coal injection combustion improver comprises aluminum powder with activated aluminum being not less than 95wt%. According to the use method of the blast furnace coal injection combustion improver, the usage amount of a fire retardant accounts for 0.065%-0.10wt% of raw coal. According to the invention, the aluminum powder is adopted as the blast furnace coal injection combustion improver, the aluminum powder is mixed with the raw coal to prepare powder and then the powder is injected into a blast furnace for combustion to accelerate the oxygen diffusion velocity of coal powder and promote the macromolecule cracking of blast furnace coal injection coal powder, so that the purposes of lowering a coal powder ignition point and increasing the combustion efficiency of the coal powder positioned in front of a blast-furnace tuyere are reached, and the usage cost of the combustion improver disclosed by the invention is reduced to 3.23-2.07 yuan / ton of iron from about 5.13-6.17 yuan / ton of iron of the traditional rare earth combustion improver; the blast furnace coal injection combustion improver disclosed by the invention has the characteristics of no alkali metal, stable combustion-supporting effect and safe and reliable use and can effectively enhance the coal ratio of the blast furnace, reduce the coke ratio, increase the output and lower the addition cost, thus effectively increasing the integral economic benefit of blast furnace coal injection.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and ironmaking, and specifically relates to a blast furnace coal-injection combustion-supporting agent that does not contain alkali metal, has a stable combustion-supporting effect, is safe and reliable to use, can effectively increase the coal ratio of the blast furnace, reduce the coke ratio, and has low compounding cost and its use method. Background technique [0002] With the development of the iron and steel industry and the depletion of high-quality coal resources, the supply of high-quality coking coal is in short supply, and the price of coke has risen. In order to reduce smelting costs and increase profits, the iron and steel industry has studied the use of coal instead of coke, and reduced coke by expanding the amount of coal injection. The amount used achieves the purpose of saving coke; at the same time, the direct injection of pulverized coal without going through the coking proce...

AI Technical Summary

Problems solved by technology

Although rare earth oxides have a certain catalytic and combustion-supporting effect, as scarce resources, the price and cost are gradually being challenged, and the cost of use is gradually rising; and the alkali metal contained in the combustion-supporting agent will increase the alkali load of the blast furnace, which will have an adverse effect on smelting. It is also difficult to use on a large scale

There are also some combustion aids that do not contain alkali metals and rare earth oxides, but the amount added generally exceeds 1%, resulting in high cost of use, and the combustion-supporting effect is not obvious; and a few solid catalytic combustion aids (such as chloride salts, nitrates, etc.) Reduce the amount of combustion aid, but it has a corrosive effect on blast furnace equipment and gas pipelines, and even adversely affects the smooth operation of the blast furnace; there are also combustion aid formulations that contain KMnO 4 , while KMnO 4 The decomposition temperature is only 240°C, which poses a certain hidden danger to the safety of storage and milling systems

Of course, the existing technologies are all multi-raw material formulas, which are generally prepared by mechanical mixing process, the process is relatively complicated, and the preparation cost is relatively high.

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