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Direct reduction metallurgy method for iron ore based on 3D printing

A 3D printing and direct technology, applied in the field of direct reduction metallurgy of iron ore based on 3D printing, and the field of direct reduction iron preparation by 3D printing, which can solve the problems of high reaction temperature, easy generation of powder and long time, and reduce the reaction temperature and time. , The effect of sufficient gas-solid contact and increased specific surface area

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

[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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  • Direct reduction metallurgy method for iron ore based on 3D printing
  • Direct reduction metallurgy method for iron ore based on 3D printing
  • Direct reduction metallurgy method for iron ore based on 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100]1) Proportionally measure 120 parts of hematite powder from Brazil, 3 parts of bentonite from India, 0.12 parts of nanometer titanium dioxide, 0.12 parts of micrometer vanadium pentoxide, 0.08 parts of micrometer cerium oxide, and 24 parts of coal powder. Stir and mix uniformly, 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 3D printing mixture in batches according to the preset programming procedure to obtain honeycomb pellets with a particle size of 10mm, and then place the honeycomb pellets in an oven at 105°C for 3 hours. .

[0102]3) Then put the above-mentioned dried honeycomb pellets in a muffle furnace at 600°C for 15min, then heat the muffle furnace to 1050°C for roasting for 1h, then use cold water to cool directly to obtain roasted ore .

[0103]4) Finally, the roasted ore is crushed and ground and then subjected t...

Embodiment 2

[0111]1) Measure 120 parts of a magnetite ore powder in Liaoning, 3.5 parts of a bentonite in Hunan, 0.18 parts of nanometer titanium dioxide, 0.12 parts of micrometer vanadium pentoxide, 0.12 parts of micrometer cerium oxide, and 28 parts of coal powder. Stir and mix uniformly, add 0.8 parts of high elastic modulus polyethylene fiber in 4 batches during the stirring process to obtain the final 3D printing mixture.

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

[0113]3) Then put the above-mentioned dried honeycomb pellets in a muffle furnace at 800°C for preheating for 10 minutes, and then heat the muffle furnace to 1000°C for roasting for 1.5 hours and then directly cooling with cold water to obtain roasting mine.

[0114]4) Finally, the roasted ore is crushed and ground and...

Embodiment 3

[0121]1) Proportionally measure 120 parts of mixed mineral powder of a magnetite in Liaoning and a hematite concentrate in Australia (with a ratio of 1:1), 4.0 parts of a bentonite in Hunan, 0.2 parts of nano-sized titanium dioxide, and micron-sized pentoxide 0.1 part of vanadium, 0.04 part of micron-level tungsten trioxide, 0.08 part of micron-level cerium oxide, 30 parts of coal powder are stirred and mixed uniformly, and 0.8 parts of polyurethane elastic fiber is added in 4 batches during the stirring process to obtain the final 3D printing mixture material.

[0122]2) Then use 3D printing equipment to print the above 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 for 3 hours. .

[0123]3) Then put the above-mentioned dried honeycomb pellets in a muffle furnace at 700°C for preheating for 12 minutes, and then heat the muffle furnace to 950°C f...

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Abstract

The invention discloses a direct reduction metallurgy method for iron ore based on 3D printing. According to the metallurgy method, a direct reduction technology using an iron ore chain grate machineand a coal-based rotary kiln is combined with a 3D printing molding technology. Through optimization of a mixture formula, the feasibility, applicability and generalization performance of the 3D printing direct reduction technology are improved. Meanwhile, by utilizing the accuracy, synchronism and uniformity of the 3D printing molding technology, stable and high-quality green pellet ore with thesame honeycomb pore structure is obtained. The green pellet ore is placed in a high-temperature furnace to obtain a qualified direct reduction iron product through drying, preheating, reduction roasting, cooling, magnetic separation enrichment, etc.

Description

Technical field[0001]The invention relates to 3D printing technology for preparing direct reduced iron, in particular to a 3D printing-based iron ore direct reduction metallurgy method, belonging 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 most important directions for the development of the 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 get rid of the constraints of coking coal resources and effectively improve the energy structure of...

Claims

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Application Information

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Patent Type & Authority Applications(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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