Method for increasing direct reduced iron metallization rate by industrial wastes containing iron and carbon

Abstract

The invention provides a method for increasing direct reduced iron metallization rate by industrial wastes containing iron and carbon. The method is to mix the industrial wastes containing iron and carbon with the mass ratio of 95 to 99 percent and vegetable powder with the weight ratio of 1 to 5 percent into additive, mix 7 to 20 percent of the additive, 50 to 70 percent of iron raw material, 18 to 25 percent of reducing agent, and 5 to 8 percent of fusing agent by mass ratio, charge, heat and reduce the mixture according to the process of conventional direct reduced iron to obtain an iron product. The method can obviously improve the metallization ratio of direct reduced iron so as to improve the yield of reduced iron, reduce energy consumption, comprehensively utilize the industrial wastes containing iron and carbon, reduce pollution of the industrial wastes on the environment and harm on the main production process of steel and iron plants, and find a perfect approach for the industrial wastes containing iron and carbon.

Description

technical field [0001] The invention relates to a method for increasing the metallization rate of direct reduced iron, in particular to a method for increasing the metallization rate of direct reduced iron by using industrial waste containing iron and carbon in iron and steel plants, and belongs to the technical field of direct reduced iron smelting. Background technique [0002] The process of directly reducing iron in a tunnel kiln, that is, the Heganus coal-based tunnel kiln reduction method, was invented by the Swedish company Hegnas in the early 20th century. The process is to put iron ore powder, coal powder as a reducing agent, and lime powder as a desulfurizing agent into the reduction tank respectively according to the set ratio and charging method, and then put the reduction tank on the trolley and push it into the tunnel. In the kiln, direct reduced iron is obtained after heating, roasting and reduction. The tunnel kiln process was first applied in the powder met...

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Problems solved by technology

Based on this principle, conventional coke powder, coal powder and other carbon-containing materials are not suitable as internal additives for the production of direct reduced iron in tunnel kilns; the best additive should be graphite with extremely low ash and sulfur content, but its price Expensive and difficult to apply in large-scale industrial production

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