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A pellet compound grinding system and a pellet compound grinding method

A compound milling and pelletizing technology, applied in chemical instruments and methods, mixers, grain processing, etc., can solve the problems of high investment in wet milling, influence of difference uniformity, difficulty in controlling the water content of the output, and achieve the maximum grinding efficiency The effects of modernization, improving quality and grade, and saving consumption

Active Publication Date: 2021-10-01
ZENITH STEEL GROUP CORP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the existing pellet grinding technology, such as high investment in wet grinding, difficulty in controlling the moisture content of the discharge material, and the influence of the uniformity of moisture differences in different materials on the operation of high-pressure roller mills, the present invention provides a pellet mill. Agglomerate compound grinding system and pellet compound grinding method realize the coupling of dry grinding and wet grinding process, greatly improving the adaptability to iron ore powder resources

Method used

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  • A pellet compound grinding system and a pellet compound grinding method
  • A pellet compound grinding system and a pellet compound grinding method
  • A pellet compound grinding system and a pellet compound grinding method

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Embodiment 1

[0047] Pellet compound grinding and batching scheme, see Table 1 for details:

[0048] Table 1 pellet grinding and batching scheme, % (mass percentage)

[0049]

[0050] In Table 1, Ig refers to burning loss. If the iron ore powder is magnetite, that is, the FeO content is very high, it will be oxidized and weighted during the roasting process, and the final burning loss is reflected as a negative number (such as burning loss "-2.2%", "-2.3%").

[0051] The process of pellet compound grinding is as follows: dry-grind iron ore powder A (the amount used is 50% of the total mass of iron ore powder), and the proportion of 0-8mm before grinding accounts for 91%, and it forms 0-200 mesh after grinding. Accounting for 90% of the finished product, the moisture before grinding is 8.5%, and the moisture after grinding is 2.0%. The iron ore powder B (the amount used is 50% of the total mass of iron ore powder) is wet-milled, and the proportion from 0-8mm before grinding accounts for ...

example 2

[0054] Table 2 pellet grinding and batching scheme, % (mass percentage)

[0055]

[0056] A pelletizing compound grinding system and a pelletizing compound grinding method, the iron ore powder A is respectively entered into a dry grinding system and a wet grinding system for processing, and the processing capacity of the dry grinding and the wet grinding is 50% each (50% of the mass of the iron ore powder ), respectively accounting for 25% of the total iron material (the fine powder mentioned in this case is all iron fine powder). In the dry grinding system, the iron ore powder A pre-mixing bin is mixed with 3% dolomite and 1% anthracite for mixed grinding. The proportion of 0-8mm before grinding accounts for 91%, and the proportion of 0-200 mesh accounts for 90% after grinding. The finished product has a moisture content of 8.5% before grinding and 2.5% after grinding; in the wet grinding system, iron ore powder A is separately compounded for grinding, and the proportion o...

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Abstract

The invention relates to a pellet compound grinding system and a pellet compound grinding method, including pre-batching, dry grinding, wet grinding, fine powder pre-batching, the first mixer, high-pressure roller mill, batching, mixer 2, manufacturing High temperature process of balls and pellets. After the iron ore powder is pre-mixed, 20‑80% of the material is dry-milled, and the rest is wet-milled. After the two are ground and discharged, the fine powder prepared in the fine powder pre-batching link is sent to the first mixer for further processing. Mixing, after mixing, the material is subjected to high-pressure roller milling to increase the specific surface area, or it is bypassed after grinding and directly enters the batching bin; then the discharged material after rolling is batched with bentonite, flux, etc. in the batching room, and the second Mixing for the first time, and finally pelletizing and high-temperature roasting of the pellets. The present invention integrates two kinds of grinding processes in a set of pelletizing process, which has the advantages of strong adaptability to mineral powder types, reducing high water pressure in high-pressure roller milling, and improving the particle size composition of pellet fine powder, which has obvious advantages compared with independent grinding process .

Description

technical field [0001] The invention relates to a pellet compound grinding system and a pellet compound grinding method. Background technique [0002] Pellets are an important part of the blast furnace charge structure in the iron and steel industry. In China, pellets account for 15% of the charge structure; The lump ore has the characteristics of less pollutant discharge and low energy consumption. In recent years, with the increasing pressure of environmental protection in various places, the production of domestic sintering machines has been frequently limited, and the production line of pellets has gradually increased. In Europe and North America, pellets have long been used as the main material for their blast furnaces, and even 100% pellets have been fed into the furnace. Combined with its own resource conditions, gradually improving pellets is the development direction of domestic agglomeration. [0003] A key difference between sintering and pelletizing is the dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C21/00B02C23/00C22B1/243C22B1/02B01F13/10
CPCB02C21/00B02C23/00C22B1/2406C22B1/243C22B1/02B01F33/80B01F33/81B01F33/82B01F33/83B01F33/834
Inventor 裴元东张俊杰张卫华顾建苛沈鸿豪张巧玉王知学周翔黄定忠盛建华陈子建刘建波刘桐孙晨夏强
Owner ZENITH STEEL GROUP CORP CO LTD
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