Method of producing sponge iron from carbon dedusting ash and iron scales

Abstract

The invention relates to method of producing sponge iron from carbon dedusting ash and iron scaless, comprising the following steps: (1) stirring evenly the raw materials including 1-50 portions of dust of blast furnace gas dust by mass, 1-20 portions of the carbon dedusting ash and 30-80 portions of iron scales, and adding and stirring 1-15 portions of water by mass and 1-5 portions of agglomerant by mass to the raw materials; (2) pressing the mixture into balls, and baking or airing the balls; (3) spreading the balls on a tunnel kiln bogie, spreading a layer of coke on the surfaces of the balls, keeping the balls at 1200+ / -100 DEG C for 12+ / -1h, cooling the balls into the sponge iron, and moving the sponge iron out of the tunnel kiln; and (4) separating the surface of the sponge iron, spreading coke powder on the sponge iron and putting the finished sponge iron which contains more than 90 percent of TFe in the storage, wherein in the step (1), less than 20 portions of coke powder by mass can be added to the mixture. The method of producing the sponge iron from the carbon dedusting ash and the iron scaless has low cost and high efficiency.

Description

technical field [0001] The invention relates to a method for producing sponge iron by utilizing dust removal ash and iron scale, in particular to a utilization method for making sponge iron by utilizing carbon dust removal ashes and iron scale. Background technique [0002] In recent years, the country has vigorously developed circular economy, energy conservation and emission reduction. However, with the rapid development of my country's metallurgical industry, the output of iron and steel has risen steadily, and the associated resources have also increased, such as iron scale and dust. If they are not used effectively, they will not only be wasted A large amount of resources will also cause serious environmental pollution. Therefore, research and utilization of these resources has become an urgent subject to be solved. For general carbon dedusting ash, most of them enter the sintering plant for sintering, but because some dedusting ash (such as blast furnace gas ash, conve...

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Problems solved by technology

For general carbon dedusting ash, most of them enter the sintering plant for sintering, but because some dedusting ash (such as blast furnace gas ash, converter dedusting ash) contains a large amount of alkali metal elements such as K, Na, Zn, etc., if it enters sintering, it will reduce The quality of sinter, especially the entry of alkali metal elements such as K, Na, and Zn into the blast furnace, will accelerate other adverse effects such as blast furnace lining erosion, thereby reducing the service life of the blast furnace

At present, most of the reducing agent for sponge iron is coke powder, which has a long production cycle and high cost. In order to improve the economic benefits of sponge iron, it is urgent to reduce its production cost

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