Low-temperature and rapid iron ore oxidized pellet preparation method and system

An oxidation pelletizing and rapid technology, applied in the low temperature and rapid iron ore oxidation pellet preparation system, the oxidation pellet preparation, the low temperature and rapid iron ore oxidation pellet preparation field, can solve the limitation of iron ore pellet technology industry Promote, increase the risk of material ring formation, affect production stability, etc., to achieve the effect of improving ventilation and heat uniformity, preventing the occurrence of ring formation, and high compressive and falling strength

Active Publication Date: 2020-12-25
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main process of the pelletizing process is the chain grate machine-rotary kiln process, which does not occupy a dominant position in my country. The reason is that this process has the following main problems: (1) The pellets cannot be effectively recycled in the chain grate machine process. Consolidation, insufficient wear resistance, easy to produce powder due to continuous motion friction in the rotary kiln, and then cause frequent ring formation accidents, poor production stability, and difficult operation; (2) High reaction temperature and long time
The reaction temperature of iron ore chain grate machine-rotary kiln to prepare oxidized pellets is generally 1250-1350°C, and the reaction time is generally 15-50 minutes. The pellets are placed in the rotary kiln for a long time in a high-temperature environment, which not only consumes a lot of energy, Moreover, the risk of material ring formation is greatly increased, which affects the stability of production and limits the industrial promotion of chain grate machine-rotary kiln iron ore pellet technology

Method used

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  • Low-temperature and rapid iron ore oxidized pellet preparation method and system
  • Low-temperature and rapid iron ore oxidized pellet preparation method and system
  • Low-temperature and rapid iron ore oxidized pellet preparation method and system

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Experimental program
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Effect test

Embodiment approach

[0069] According to the first embodiment of the present invention, a kind of low temperature and rapid iron ore oxidation pellet preparation method is provided:

[0070] A low-temperature and fast method for preparing iron ore oxidized pellets, the method comprising the following steps: 1) making a 3D printing mixture: uniformly mixing raw materials to obtain a 3D printing mixture, the raw materials including: iron concentrate, bonding agent, titanium dioxide, vanadium pentoxide, fiber; 2) making pellets: using 3D printing technology to make 3D printing mixture into green pellets; 3) prefabrication treatment: prefabricating and drying the green pellets to obtain dry Green pellets; 4) Oxidation and roasting treatment: Carry out oxidation and roasting treatment on the dried green pellets to obtain finished pellets.

[0071] As preferably, the 3D printing compound comprises:

[0072] Iron concentrate: 70-150 parts by weight, preferably 80-140 parts by weight, more preferably 90-...

Embodiment 1

[0094] Take 100 parts of hematite concentrate from Brazil, 1.8 parts of bentonite from India, 0.08 parts of nano-sized titanium dioxide, 0.1 part of micron-sized vanadium pentoxide, 1.6 parts of high elastic modulus polyethylene fiber, and 10 parts of tap water to mix in proportion. Obtain the final mix. Among them, the particle size of a hematite concentrate in Brazil is -0.074mm, which is 92.50%, the water absorption rate of a bentonite in India is 230%, the particle size range of nano-sized titanium dioxide is ≤30nm, and the particle size range of micron-sized vanadium pentoxide is ≤20μm, the average length range of high elastic modulus polyethylene fibers is 14mm, and the elastic modulus is 100N / tex.

[0095] A comparative test of green pellets obtained by using traditional pelletizing discs and green pellets obtained by 3D printing technology was carried out. The compressive strength is 4.2 times / 0.5m, the compressive strength is 10.4N / piece, and the burst temperature is...

Embodiment 2

[0098] Take 100 parts of a mixture of magnetite in Liaoning and hematite concentrate in Australia (the ratio is 1:1), 2.8 parts of bentonite in Hunan, 0.12 parts of nano-scale titanium dioxide, and 2.4 parts of high elastic modulus polyethylene fiber. part, 0.15 part of micron vanadium pentoxide, and 13.0 parts of tap water were mixed to obtain the final mixture. Among them, the particle size of a magnetite in Liaoning is -0.074mm, which is 95.65%, the particle size of a hematite concentrate in Australia is -0.074mm, which is 93.20%, and the water absorption rate of a certain bentonite in Hunan is 185%. ≤20nm, the particle size range of micron vanadium pentoxide is ≤15μm, the average length of the high elastic modulus polyethylene fiber is 18mm, and the elastic modulus is 120N / tex.

[0099] A comparative test of green pellets obtained by using traditional pelletizing discs and green pellets obtained by 3D printing technology was carried out. is 4.5 times / 0.5m, the compressive...

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Abstract

The invention discloses a low-temperature and rapid iron ore oxidized pellet preparation method and system. The method includes the following steps that (1) a 3D printing mixture is prepared, specifically, raw materials are uniformly mixed,the 3D printing mixture is obtained, and the raw materials include iron ore concentrate, a binder, titanium dioxide, vanadium pentoxide and fibers; (2) pellet ore is prepared, and specifically, the raw pellet ore is prepared from the 3D printing mixture with the 3D printing technology; (3) prefabrication treatment is performed, specifically, prefabrication drying treatment is performed on the raw pellet ore, and dried raw pellet ore is obtained; and (4) oxidizing roasting treatment is performed, specifically, oxidizing roasting treatment is performed onthe dried raw pellet ore, and the finished pellet ore is obtained. According to the technical scheme, the generation amount of powder of the pellet ore in a chain grate machine and rotary kiln systemcan be effectively reduced, the ring formation phenomenon is prevented, and the frequency of shutdown for maintenance is reduced; the air permeability and heat uniformity of the pellets are improved,the pellet roasting temperature is lowered, the pellet roasting time is shortened, and thus the energy consumption in the chain grate machine and rotary kiln technological process is reduced, and thenthe production cost of an enterprise is reduced.

Description

technical field [0001] The invention relates to a method for preparing oxidized pellets, in particular to a method for preparing low-temperature and fast iron ore oxidized pellets, which belongs to the technical field of ore pellets; the invention also relates to a low-temperature and fast iron ore oxidized pellets preparation system. Background technique [0002] As an irreplaceable structural and functional material in the process of industrialization, steel consumption accounts for more than 95% of the total metal consumption for a long time. Pellet preparation is one of the main processes in the early stage of steel production. my country's 2018 ball The output of regiment has reached about 140 million tons, which occupies an important position in the national economy. The scale effect of most pellet plants is significant. For example, in 2018, the annual pellet production of Zhanjiang Iron and Steel Plant, Baotou Iron and Steel Plant, and Shougang Jingtang Iron and Stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
CPCC22B1/2406
Inventor 赵强
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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