Fine iron powder pre-pressing-roller grinding system and method

A technology of iron fine powder and high-pressure roller mill, which is applied in the field of iron fine powder pre-pressing-roller mill system, which can solve the problem of material blockage and material collapse in the feed channel, affecting the pretreatment application of high-pressure roller mill, and the operation of high-pressure roller mill. Stability and other issues, to achieve the effect of improving the index of rolling products

Pending Publication Date: 2021-01-12
CHENGDU LEEJUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In domestic high-pressure roller mill pretreatment pellet production process, due to large fluctuations in the raw material moisture and fineness of iron powder, the feed channel of the high-pressure roller mill is often blocked and collapsed, which makes the operation of the high-pressure roller mill unstable and seriously affects the high-pressure roller mill. Application of Roll Mill Pretreatment in Pellet Production

Method used

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  • Fine iron powder pre-pressing-roller grinding system and method
  • Fine iron powder pre-pressing-roller grinding system and method
  • Fine iron powder pre-pressing-roller grinding system and method

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Effect test

Embodiment 1

[0046] A kind of iron fine powder pre-pressing-roller milling system, such as Figure 1-4As shown, it includes a feeding system, a pre-press 4 and a high-pressure roller mill 6, and the high-pressure roller mill 6 is connected to the pre-press 4 for pre-compressing the material; the feed port of the pre-press 4 is connected to the material system, and the material supply between the material system and the pre-press 4 is linked with each other.

[0047] Described pre-pressing machine 4 comprises frame 401, cylinder 402, locking mechanism 403 and driving mechanism 404, and described cylinder 402 is horizontally arranged in the frame 401 in pairs, and forms roll gap between the cylinder 402 of pair; The roller 402 is provided with a locking mechanism 403 to prevent the displacement of the roller 402 , and the main shaft of the roller 402 is connected with a driving mechanism 404 for driving the roller 402 to rotate.

[0048] Frame 401 is processed by welding steel plates, and t...

Embodiment 2

[0066] A pelletizing plant in Panzhihua used the high-pressure roller mill process to frequently cause material blockage and material collapse, and the system operation was very unstable. After adopting the pre-pressing-roller milling process after modification, the overall operating efficiency is high; the product index is significantly improved, the -200 mesh content is only increased by 4-6%, and the specific surface area is increased by 300-600cm 2 .g -1 , The ball forming rate has increased by 3.30%.

Embodiment 3

[0068] A domestic pelletizing factory adopted the wet grinding process in the early stage, with high installed power and high power consumption; the process is long and the operating efficiency is low, the product index has not improved significantly, and the -200 mesh content has only increased by 1-2%. ;Using this pre-pressing-roller milling process to pretreat the raw materials of the pellets, and replace the wet mill. The installed power is reduced by more than half, the power consumption is significantly reduced, the process flow is shortened, and the overall operating efficiency is high. When the moisture content is 6.0%-7.0%, the particle size content of -0.074mm in the iron concentrate is lower than that after rolling. Increased by 4.53%, the specific surface area increased by an average of 402cm 2 .g -1 , The amount of bentonite is reduced by about 40%, which greatly improves the pelletizing performance of iron concentrate and improves the quality of green pellets. ...

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Abstract

The invention discloses a fine iron powder pre-pressing-roller grinding system and method, and relates to the field of pretreatment of fine iron powder pellet raw materials. The fine iron powder pre-pressing-roller grinding system comprises a feeding system, a pre-pressing machine and a high-pressure roller grinding machine, wherein the high-pressure roller grinding machine is connected with the pre-pressing machine for pre-pressing materials, a feeding port of the pre-pressing machine is connected with the feeding system, and material supply between the feeding system and the pre-pressing machine is in linkage. According to the fine iron powder pre-pressing-roller grinding system and method, fine iron powder becomes compact from a loose state through pre-pressing of the pre-pressing machine, and the requirements of operation of the high-pressure roller grinding machine for a stock column and a stock level are effectively reduced; the influence of supplied material fluctuation on the rolling effect is effectively reduced; air among the materials is exhausted in advance under the pre-pressing action, so that the product rolling index of the high-pressure roller grinding machine is effectively increased; the materials are effectively prevented from being accumulated to block a feeding channel; and the equipment operation is easy, the technological process is short, the system operation is stable, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of pretreatment of iron fine powder pellet raw materials, in particular to an iron fine powder pre-pressing-roller milling system and method. Background technique [0002] Iron ore pellets have good metallurgical properties, can significantly improve the air permeability of the blast furnace charge column, increase the utilization factor of the blast furnace, reduce the coke ratio and slag content and other metallurgical production indicators, and are considered to be a high-quality charge necessary for the optimization of the charge structure of the blast furnace charge. The role in the steel industry is getting more and more attention, and the amount is also increasing. With the rapid development of my country's iron and steel industry and the reduction of rich ore resources, the import of iron ore continues to increase. How to make good use of low-priced, high-grade iron ore concentrates at home and abroad, but wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/24
CPCC22B1/00C22B1/2406
Inventor 何亚民丁亚卓徐智平
Owner CHENGDU LEEJUN IND
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