A direct reduction metallurgy method of iron ore based on 3D printing

A 3D printing, direct technology, applied in 3D printing to prepare direct reduced iron, based on 3D printing in the field of iron ore direct reduction metallurgy, can solve the problems of easy powder generation, high reaction temperature, long time, etc., to achieve sufficient gas-solid contact, Reducing the reaction temperature and time, and the effect of increasing the specific surface area

Active Publication Date: 2022-04-12
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the deficiencies of the prior art, and prepares iron-containing raw materials into honeycomb pellets by adopting 3D printing technology, so as to solve the problems of easy generation of powder in the grate stage, easy to cause ring formation, high reaction temperature and long time, etc.

Method used

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  • A direct reduction metallurgy method of iron ore based on 3D printing
  • A direct reduction metallurgy method of iron ore based on 3D printing
  • A direct reduction metallurgy method of iron ore based on 3D printing

Examples

Experimental program
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Effect test

Embodiment 1

[0100] 1) Take 120 parts of hematite ore powder in Brazil, 3 parts of bentonite in India, 0.12 parts of nano-sized titanium dioxide, 0.12 parts of micron-sized vanadium pentoxide, 0.08 parts of micron-sized cerium dioxide, and 24 parts of coal powder in proportion. Stir and mix evenly, and add 0.6 parts of high elastic modulus polyethylene fiber in batches 3 times during the stirring process to obtain the final 3D printing mixture.

[0101] 2) Then use the 3D printing equipment to print the above-mentioned 3D printing mixture in batches according to the preset programming procedure to prepare honeycomb pellets with a particle size of 10mm, and then place the honeycomb pellets in an oven at 105°C to dry for 3 hours .

[0102] 3) Then put the above-mentioned dried honeycomb pellets in a muffle furnace to preheat at 600°C for 15 minutes, then raise the temperature of the muffle furnace to 1050°C for roasting for 1 hour, and then directly cool with cold water to obtain roasted ore...

Embodiment 2

[0111] 1) Take 120 parts of magnetite ore powder in Liaoning, 3.5 parts of bentonite in Hunan, 0.18 parts of nano-sized titanium dioxide, 0.12 parts of micron-sized vanadium pentoxide, 0.12 parts of micron-sized cerium dioxide, and 28 parts of coal powder in proportion. Stir and mix evenly, and add 0.8 parts of high elastic modulus polyethylene fiber in batches 4 times during the stirring process to obtain the final 3D printing mixture.

[0112] 2) Then use the 3D printing equipment to print the above-mentioned 3D printing mixture in batches according to the preset programming procedure to prepare honeycomb pellets with a particle size of 12mm, and then place the honeycomb pellets in an oven at 105°C to dry for 3 hours .

[0113] 3) Then put the above-mentioned dried honeycomb pellets in a muffle furnace to preheat at 800°C for 10 minutes, then raise the temperature of the muffle furnace to 1000°C and roast for 1.5 hours, then cool directly with cold water to obtain roasting ...

Embodiment 3

[0121] 1) 120 parts of mixed ore powder (1:1 ratio) of magnetite in Liaoning and hematite concentrate in Australia, 4.0 parts of bentonite in Hunan, 0.2 parts of nano-sized titanium dioxide, and micron-sized pentoxide were measured in proportion. 0.1 part of vanadium, 0.04 part of micron-sized tungsten trioxide, 0.08 part of micron-sized cerium oxide, and 30 parts of coal powder are stirred and mixed evenly. During the stirring process, 0.8 parts of polyurethane elastic fiber are added in batches to obtain the final 3D printing mixture. material.

[0122] 2) Then use the 3D printing equipment to print the above-mentioned 3D printing mixture in batches according to the preset programming procedure to obtain honeycomb pellets with a particle size of 11mm, and then place the honeycomb pellets in an oven at 105°C to dry for 3 hours .

[0123] 3) Then put the above-mentioned dried honeycomb pellets in a muffle furnace for preheating at 700°C for 12 minutes, then raise the temperat...

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Abstract

The invention discloses a 3D printing-based iron ore direct reduction metallurgy method. The invention combines iron ore chain grate-coal-based rotary kiln direct reduction technology with 3D printing molding technology. Through the optimization of the mixture formula, the feasibility, applicability and promotion of 3D printing direct reduction technology are improved. At the same time, the accuracy, synchronization and uniformity of 3D printing technology are used to obtain stable and high-quality green pellets with the same honeycomb pore structure. The green pellets are placed in a high-temperature furnace and subjected to drying, preheating, reduction roasting, cooling, magnetic separation and enrichment, etc., to obtain qualified direct reduced iron products.

Description

technical field [0001] The invention relates to the technology of preparing direct reduced iron by 3D printing, in particular to a direct reduction metallurgical method of iron ore based on 3D printing, which belongs to the technical field of reduction metallurgy. Background technique [0002] With the development and progress of iron and steel production technology, as well as the adjustment of energy structure and the improvement of environmental protection requirements, non-blast furnace ironmaking technology has become a hot spot in the research and development of iron and steel metallurgy technology. Among them, the direct reduction process has become one of the very important directions for the development of the iron and steel industry due to its short process and strong market adaptability. Compared with the traditional blast furnace-converter smelting process, the development of direct reduction technology can not only get rid of the shackles of coking coal resource...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/242C22B1/02C21B13/00B03C1/00B33Y70/10B33Y80/00
CPCC22B1/24C22B1/242C22B1/02C21B13/0066B03C1/00B33Y70/00B33Y80/00
Inventor 赵强魏进超廖继勇戴波
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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