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A method of distributing ultra-fine ore for composite agglomeration process

A technology of composite agglomeration and concentrate, applied in the field of metallurgy, can solve the problems of over-melting layer, affecting the normal progress of sintering, etc., and achieve the effect of increasing the application ratio

Inactive Publication Date: 2011-12-28
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During this period, the feeding method has been adjusted many times, such as adding a reflector at the front end of the multi-roller distributor, and the angle and position of the reflector have also been adjusted many times. The angle of the reflector and the distance from the bottom of the trolley are based on the material The speed, the particle size composition of the mixture, the ratio of green pellets and other parameters are adjusted. After a period of operation, the reasonable segregation of green pellets and fuel in the mixture cannot be solved well, and the "over-melt layer" still appears. , affecting the normal progress of sintering

Method used

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  • A method of distributing ultra-fine ore for composite agglomeration process
  • A method of distributing ultra-fine ore for composite agglomeration process

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Experimental program
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Effect test

Embodiment 1

[0019] Test on a 265m 2 On the sintering machine. The proportion of fine ore in the reference period and the test period is 15wt% (to account for iron material). In the test period, 30-50wt% ultra-fine concentrate is used instead of Baotou's self-produced iron concentrate. At the same time, the thickness of the material layer in the test period is lower than that in the reference period. Increase by 100mm. During the test, 5-30wt% of superfine concentrate was pelletized, the particle size of the green pellets was stable, and the original cloth was still used for the cloth, namely, swing belt→wide belt→nine-roll distributor, only adjusting the speed of the multi-roll distributor and The number and location of the looser. The speed of the multi-roll distributor is increased by 6-8r / min compared with the reference period, the number of looseners is reduced to a single row, and the air permeability of the material layer is obviously improved.

[0020] The results showed that the pr...

Embodiment 2

[0022] Under the conditions of the same type and proportion of iron materials, using the same material layer thickness and the same technology, the green ball proportion has been increased from 5wt% to 18wt%, which means that the proportion of ultrafine concentrate has increased by about 14%. On the basis of the distributing device, only the rotation speed of the multi-roll distributing device is adjusted to 2~4r / min, and the particle size of the green balls remains stable at 4~12mm. The results show that due to the improved material layer permeability, the pressure of the main pipe of the sintering machine is reduced by 0.2kPa, and the speed of the sintering machine is increased by 0.02m / min. At the same time, due to the reasonable distribution of green pellets and fuel, the sintering fuel consumption is reduced by about 2kg / t, and the quality of the finished ore Maintained stability, and did not deteriorate with the increase in the proportion of self-produced ultra-fine concen...

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Abstract

The present invention relates to a method for distributing ultrafine concentrates in a composite agglomeration process. In the present invention, a part of the ultra-fine concentrate is made into raw balls of a certain particle size, and after mixing with another part of the sintering mixture, through a certain distribution technology, that is, adjusting the rotation speed of the multi-roller distributor rollers and the placement position of the loosener to carry out Reasonable fabric. Especially when the amount of raw balls in the mixture is different, the distribution method can make the raw balls and fuel reasonably distributed on the sintering machine trolley, which can not only improve the air permeability of the upper material layer of the sintering machine trolley, The fuel consumption can also be optimized.

Description

Technical field [0001] The invention relates to a method for distributing superfine concentrates to implement a composite agglomeration process, and belongs to the technical field of metallurgy. Background technique [0002] In recent years, Baotou Steel's steel production capacity has also developed rapidly along with the market growth of the domestic steel industry, and the demand for iron ore has also greatly increased. On the one hand, due to the tight domestic and international iron ore market, price, transportation and other factors, on the other hand, the use of its own iron ore resources can greatly reduce the cost of pig iron. For this reason, Baotou Steel has increased the development of its own mineral resources, except for those already developed. In addition to the main east mine of Baiyun Obo, the Baiyun Obo West Mine was newly developed and transported through the slurry pipeline. Due to the low grade of raw ore of Baosteel ore, its iron concentrate has a finer gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 邬虎林陈革吴雷尤学东王瑞军边美柱赵彬吕志义
Owner INNER MONGOLIA BAOTOU STEEL UNION
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