Technology for producing high-proportion hematite pellets through chain-loop-ring system

A technology of ring system and iron ore pellets, which is applied in the field of chain-back-ring system to produce high-proportion hematite pellets, can solve the problems of limited hematite quantity, and improve the iron grade and reducibility of pellets Excellent, strong process implantability effect

Inactive Publication Date: 2016-03-30
BEIJING SHOUGANG INT ENG TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a process for producing high proportion hematite pellets with a chain-back-loop system, which solves the problem that the amount of hematite added to the raw material is limited

Method used

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  • Technology for producing high-proportion hematite pellets through chain-loop-ring system
  • Technology for producing high-proportion hematite pellets through chain-loop-ring system
  • Technology for producing high-proportion hematite pellets through chain-loop-ring system

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Embodiment 1

[0033] Take Anyang's 1.2 million t / a pellet production example as an example.

[0034] The ratio of hematite to magnetite is 7:3.

[0035] Hematite (amount ≥ 70%, or even 100%) and magnetite are pre-mixed according to a certain ratio, and then enter the wet grinding workshop together. The original particle size of the mixture -200 mesh accounts for 81.8%, and -325 mesh accounts for 51.97%. After a period of open circuit grinding (wet grinding process such as image 3As shown), -200 mesh accounts for 98%, and -325 mesh accounts for 80%. Equipped with 2 sets of MQY3600×8500 overflow ball mills and 6 sets of HTG-80㎡ ceramic filters (2 sets for spare). The small-sized iron ore concentrate selected by the ceramic filter enters the dryer for drying, and the water content is controlled at 8±0.5%. Improve the particle shape and increase the specific surface area of ​​the particles on the high-pressure roller mill. 70% hematite is added with 30% magnetite, and the specific surface ...

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Abstract

The invention discloses a technology for producing high-proportion hematite pellets through a chain-loop-ring system, and belongs to the technical field of production of iron ore pellets in the metallurgical industry. The technology comprises the steps that powdered iron pre-batching is carried out, bentonite is added into the pre-batching powder, a pelletizing disc is used for pelletizing, and the content of fresh pellets with the granularity being 12+/-2mm is larger than or equal to 98% by weight; then the pallets enter the chain-loop-ring system, the air temperature of a rotary kiln keeps between 1300 DEG C to 1350 DEGC, and four-segment cooling is adopted in a ring cooling machine; through the technologies of wet grinding, high-pressure rolling and natural gas nozzle heat supplementing are additionally performed, the granularity of hematite is reduced, the specific surface area is increased, the grain surface is activated, and the quality of the fresh pellets is increased. The technology has the beneficial effects that the matching average of the hematite is larger than or equal to 70% and even reaches 100%; and the pellets with the strength larger than or equal to 2500N/unit occupies 98%, and the proportion of the bentonite is lower.

Description

technical field [0001] The invention belongs to the technical field of iron ore pellet production in the metallurgical industry, and in particular relates to a process for producing high-proportion hematite pellets by a chain-back-loop system. It is suitable for the production of high proportion hematite acid oxidation pellets. Background technique [0002] In the field of iron ore pellet production in iron and steel metallurgy, FeO oxidation in magnetite releases heat, which can save about 50% of heat input; the solid phase consolidation starts at a low temperature and lasts from 800°C to 1350°C, and the consolidation mechanism has Fe 2 o 3 Microcrystalline connection, Fe 2 o 3 Recrystallization, Fe 3 o 4 There are four types of recrystallization and liquid phase bonding, with strong consolidation into spheres and good pellet reduction; while hematite has a high consolidation temperature and high fuel consumption, and the intergranular bridges start to form at 1300 ° C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/16
CPCC22B1/2406C22B1/16
Inventor 解海波李长兴陈伟田
Owner BEIJING SHOUGANG INT ENG TECH
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