Technique for proportioning different materials in steel plant

Abstract

The invention relates to a technique for proportioning different materials in a steel plant. A proportioning room adopts a set of system A and a set of system B to proportion, wherein, the A system ismainly used for adding fine dry mash such as ferriferous dust; and the B system is mainly used for adding wet materials with less 13% water, or wet materials and auxiliary raw materials such as powder coal. The invention thoroughly solves the problem of dust dispersion in the proportioning process due to the dust with different properties, and the device layout of a workshop is more flexible simultaneously.

Description

technical field [0001] The invention belongs to the technical field of production of sintered ore, pellet ore and metallized pellets in the iron and steel industry, and in particular relates to a compounding technology for processing materials with different properties in iron and steel plants. Background technique [0002] Iron and steel enterprises, such as sintering plants or other dust processing plants, generally use raw material mixing systems: several high-level silos are arranged in a row (each silo contains only one raw material), and raw materials are fed from the silo through a disc. Machine or screw feeder, spread evenly on a movable batching belt in proportion, and the end of the belt sends the mixed material to the mixing system, that is, different materials are sent to the mixing device for mixing. [0003] There are following deficiencies in such commonly used raw material matching technology: [0004] (1) In the direct reduction process of the rotary hearth...

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Problems solved by technology

[0004] (1) In the direct reduction process of the rotary hearth furnace for dust treatment in iron and steel enterprises, in order to ensure stable product quality and performance, the dust generated in each process must be added separately. There are as many as 5 to 10 types of dust. If you consider the spare silo , the process layout of these silos lined up will be very long, the batching belt is very long, and the plant construction is also very long, which not only causes excessive resistance to the operation of the batching belt, but also has strict requirements for the site selection of the factory area (long strips are required site); no matter where there is a problem in the batching transmission system, the entire system will be unusable, reducing the operating rate of the batching system

[0005] (2) The material properties of dust, dust sludge and auxiliary raw materials (such as coal powder, binder, etc.) produced by various processes of iron and steel enterprises are different, such as blast furnace dry dust removal ash, converter dry dust fine ash, converter environment dust removal ash The finer particle size of -200 mesh accounts for more than 80% of the dust removal dust of the coking part and the coking part, and problems such as dust raising and difficulty in adding water are easy to occur during the mixing process; while the sludge materials such as converter sludge and rolling line sludge have large water content and need to be placed for a long time Too long and easy to agglomerate

Adding to the batching belt will cause a lot of dust on the batching belt and it is difficult to control. The general solution is to mix the wet material first and then the dry material. However, the dust is still serious and difficult to be effectively controlled

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