Preparation process and device of sponge iron

Abstract

The invention relates to a preparation process and a device of sponge iron, belonging to metallurgical industry steel-making raw material. The process comprises the following steps: mixing iron-containing raw materials with reducing agent, solvent and catalyst to prepare ultra fine powder, passivating and mixing to make pelletizing materials, sending the prepared pelletizing materials into a reducing furnace, drying and roasting, and obtaining sponge iron after the reduction reaction. The reducing device is connected with an upper furnace above a furnace base, a lower furnace body is connected to the downside of the furnace base, the upper end of the upper furnace body is connected with an upper furnace mantle, a drying bed grate is positioned at the upper end in the upper furnace body, a purifying device is connected with the upper furnace body and the lower furnace body through pipelines, and a residual heat circulating device is connected with the lower furnace body. The invention has the advantages that: firstly, the reduction temperature is reduced, the reduction speed is increased, the energy consumption is reduced, the production cost is lowered, the production efficiency is improved, and the uniformity of the quality is ensured; secondly, the degree of mechanization is high, the procedure is simple, the yield is large, the mass production can be performed; thirdly, the waste of raw materials is lowered, the environment pollution is reduced; and fourthly, the waste resource can be recycled so as to save the resource consumption.

Description

technical field [0001] The invention relates to a metallurgical industry steelmaking raw material, in particular to a preparation process and equipment for sponge iron. Background technique [0002] Sponge iron is a metallized product obtained by reducing or deoxidizing solid iron oxide powder (usually hematite) or other iron-containing oxides by using a non-blast furnace process below the melting point of iron, usually called direct reduction Iron (DRI). During the iron ore reduction process, due to the loss of oxygen, a large number of holes are formed inside, which retains the shape of the iron ore and the gangue in the ore. Its weight is 30% less than that of iron ore, and its specific gravity is about 4.4g / cm 3 . [0003] Sponge iron is a substitute for scrap steel and pig iron. It is characterized by low carbon content (<2%), more than 90% of total iron, not only low phosphorus and sulfur content, but also does not contain copper, zinc and other impurities compare...

AI Technical Summary

Problems solved by technology

However, H 2 The preparation cost is expensive, and H 2 The primary utilization rate is about 25%, the energy consumption per ton of iron is relatively high, and it is still difficult to prepare micro-nano powder in large quantities in industry, and the preparation cost is high

Under the current conditions, this achievement does not yet have industrial application

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