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Gas-based DRI (direct-reduced iron) device and rapid iron reduction method

A reduced iron, direct technology, applied in the direction of fluidized bed furnace, furnace, furnace type, etc., can solve the problems of scrap steel backlog, casting difficult to buy, etc., and achieve the effect of a wide range of sources

Inactive Publication Date: 2017-09-01
唐竹胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the foundry market also gradually has problems such as a backlog of scrap steel and difficulty in buying castings.

Method used

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  • Gas-based DRI (direct-reduced iron) device and rapid iron reduction method
  • Gas-based DRI (direct-reduced iron) device and rapid iron reduction method
  • Gas-based DRI (direct-reduced iron) device and rapid iron reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Embodiment 1 (secondary reduced iron powder)

[0082]Adopt TFe73.2% ordinary carbon steel oxide scale, grinding fineness to 200 mesh, pass rate 100%; use the gas-based direct reduction iron method device of the present invention, add a flame-trap type rotary reduction kiln with a diameter of ￠159mm×1500mm Inside, silicon carbide rods are used to heat through the flame, and at the center point of the kiln hood, the hydrogen channel of the three-channel spray gun assembly is used to feed H 2 , the pressure is 1200Pa, the reduction temperature is 870°C, after 5 hours of deep reduction, stop heating, H 2 After the pressure was reduced to 400Pa and continued to supply hydrogen for 8 hours, the temperature of the material reached 86°C, the reduced iron powder was taken out, and its indicators were tested, as shown in Table 1.

[0083] Table 1

[0084]

Embodiment 2

[0085] Embodiment 2 (medium and low-end mechanical parts - counterweight iron block)

[0086] TFe69.68% iron ore powder is used, and the grinding fineness is 200 mesh, and the passing rate is 100%. The air-based direct reduction iron method device of the present invention is used, and a flame-insulated rotary reduction kiln with a diameter of ￠159mm×1500mm is added, and silicon Carbon rods are heated by flame insulation, and water gas (mainly composed of H 2 and CO), the pressure is 1350Pa, the reduction temperature is 990°C, after reduction for 3.2 hours, a small amount of water vapor (saturated steam) is injected into the center point of the kiln head cover for about 0.5 hours through the water vapor channel of the three-channel spray gun assembly; stop Introduce water vapor and stop gas supply, use the hydrogen channel of the three-channel spray gun assembly to continue to inject H 2 , after reducing for 0.5h, stop heating, directly add hot reduced iron powder into the mol...

Embodiment 3

[0090] Embodiment 3 (medium and high-end mechanical parts)

[0091] The ultra-pure iron powder of TFe71.8% is used, and other indicators all meet the requirements of powder metallurgy ultra-pure iron fine powder, and the grinding fineness reaches 200 mesh, and the pass rate is 100%; ￠159mm×1500mm flame-chambered rotary reduction kiln, adopts silicon carbon rods to heat the flame-chambered furnace, and uses the hydrogen channel of the three-channel spray gun assembly to inject H into the central point of the kiln hood. 2 , the pressure is 1250Pa, the reduction temperature is 880°C, after reduction for 3.5 hours, stop adding, directly heat the hot reduced iron powder into the mold of a 1250t hydraulic press, and then freely roll it into a round steel bar of about ￠30mm, after cooling , processed it into a round bar sample of ￠16mm, and measured its density to be 7.81t / m 3 , and its physical indicators are shown in Table 3 after testing.

[0092] table 3

[0093]

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Abstract

The invention belongs to the field of metallurgy and metallurgical equipment, and relates to a gas-based direct reduction iron method device and a method for rapidly reducing iron. The device of the present invention uses reducing gases such as H2, water gas, and coke oven gas as reducing agents for 140-325-mesh powdered iron ore to perform deep reduction deoxidation, decarburization, and desulfurization to realize gas-based reduction of iron. The invention can be used for deoxidation, decarburization, desulfurization and other treatments of copper powder, cobalt powder, nickel powder, tungsten powder, molybdenum powder and other metal powder materials. In addition to the deep reduction of ordinary iron ore powder, the device and method can also directly reduce ultra-pure iron concentrate powder or iron oxide scale into secondary reduced iron powder for powder metallurgy without the need for secondary reduction. The hot powder metallurgy powder after reduction is directly hot loaded and sent to the hydraulic press mold, and various mechanical parts and components are produced by hot rolling. This device is also suitable for coal-based direct reduction of DRI products.

Description

technical field [0001] The invention belongs to the field of metallurgy and metallurgical equipment, in particular to a gas-based direct reduction iron method device and a method for rapidly reducing iron. Background technique [0002] Internationally, direct reduced iron is divided into coal-based method and gas-based method. As the name implies, the coal-based method uses raw materials containing fixed carbon such as coal, coke, semi-coke or even biomass as the reducing medium (reductant), and reduces products such as DRI at high temperatures; the gas-based method uses CO, H 2 In order to reduce the medium (reductant) at high temperature and reduce products such as DRI. [0003] In the world, gas-based iron reduction equipment and technologies, represented by Midrex method, HYLⅢ method and FIOR method, account for more than 80% of the international market. 2 As a reducing medium, natural gas consumed per ton of iron is 400-600m 3 , in areas rich in natural gas resources...

Claims

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Application Information

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IPC IPC(8): C21B13/00B22F9/22C21C7/06C21C7/068C21C7/064
CPCC21B13/00B22F9/22C21C7/06C21C7/064C21C7/068
Inventor 唐竹胜唐佳王皓阳陈惠忠
Owner 唐竹胜
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