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Method for preparing qualified microalloyed iron powder with primary reduced iron powder with high hydrogen loss and high carbon

A technology of micro-alloyed iron powder and reduced iron powder, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of low hydrogen loss and carbon content, high resource dependence, strong stability, etc., and achieve comprehensive manufacturing cost reduction. , the effect of expanding the abundance of resources and suppressing the increase of hydrogen loss

Active Publication Date: 2018-08-17
YUXI DAHONGSHAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the primary iron powder used in the steel belt furnace has low hydrogen loss and carbon content, strong stability, high resource dependence, and does not reflect the characteristics of microalloyed iron powder rich in various alloying elements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix low-grade vanadium-titanium magnetite with ordinary anthracite at a mass ratio of 55.65:13, then add industrial salt and grind and separate after conventional catalytic reduction at 1060°C for 33 hours to obtain primary reduced iron with high hydrogen loss and high carbon powder (grinding separation process is: crushing→grinding magnetic separation (three repetitions)→dehydration→drying→classification→high hydrogen loss and high carbon primary iron powder).

[0027] Among them, the chemical composition of low-grade vanadium-titanium magnetite is: TFe 55.65%, SiO 2 4.45%, Al 2 o 3 3.73%, TiO 2 6.86%, V 2 o 5 0.79%, S 0.120%, FeO 24.23%; the chemical composition of ordinary anthracite is: Ash 14.80%, V9.20%, S 0.80%, fixed C content 77.36%, fineness 60 mesh; the chemical composition of industrial salt is: NaCl 99.3 %, KCl0.025%, MgCl 2 0.025%, CaCl 2 0.025%, CaSO 4 0.25%, SiO 2 0.025%.

[0028] The main components of the obtained primary reduced iron...

Embodiment 2

[0034] Mix low-grade vanadium-titanium magnetite with ordinary anthracite at a mass ratio of 55:12, then add industrial salt and grind and separate after conventional catalytic reduction at 1040°C for 36 hours to obtain primary reduced iron with high hydrogen loss and high carbon powder (grinding separation process is: crushing→grinding magnetic separation (three repetitions)→dehydration→drying→classification→high hydrogen loss and high carbon primary iron powder).

[0035] Among them, the chemical composition of low-grade vanadium-titanium magnetite is: TFe 54.93%, SiO 2 4.87%, Al 2 o 3 3.79%, TiO 2 7.03%, V 2 o 5 0.76%, S 0.126%, FeO 22.63%; the chemical composition of ordinary anthracite is: Ash 15.67%, V9.55%, S 0.86%, fixed C content 75.88%, fineness 60 mesh; the chemical composition of industrial salt is: NaCl 99.2 %, KCl0.028%, MgCl 2 0.022%, CaCl 2 0.031%, CaSO 4 0.27%, SiO 2 0.020%.

[0036] The main components of the obtained primary reduced iron po...

Embodiment 3

[0042] Mix low-grade vanadium-titanium magnetite with ordinary anthracite at a mass ratio of 57:15, then add industrial salt and grind and separate after conventional catalytic reduction at 1080°C for 32 hours to obtain primary reduced iron with high hydrogen loss and high carbon powder (grinding separation process is: crushing→grinding magnetic separation (three repetitions)→dehydration→drying→classification→high hydrogen loss and high carbon primary iron powder).

[0043] Among them, the chemical composition of low-grade vanadium-titanium magnetite is: TFe 55.93%, SiO 2 4.47%, Al 2 o 3 3.39%, TiO 2 6.63%, V 2 o 5 0.71%, S 0.116%, FeO 23.85%; chemical composition of ordinary anthracite: Ash 15.25%, V8.98%, S 0.86, fixed C content 76.01%, fineness 60 mesh; industrial salt chemical composition: NaCl 99.32% , KCl0.033%, MgCl 2 0.021%, CaCl 2 0.029%, CaSO 4 0.23%, SiO 2 0.022%.

[0044] The main components of the obtained primary reduced iron powder with high hy...

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Abstract

The invention discloses a method for preparing qualified micro-alloyed iron powder from primary reduced iron powder with high hydrogen loss and high carbon. The primary reduced iron powder with high hydrogen loss and high carbon is heated and dried, and the distribution amount is controlled to be balanced, stable and agglomerated. The particle size and material surface are smooth and smooth, and sent to the secondary fine reduction steel belt furnace for fine reduction, and the temperature of 1 to 10 deoxidization and decarburization zones is adjusted from low to high depending on the decarburization and deoxidation effect; then the secondary fine reduction The iron lumps for export are reduced, pulverized, and passed through conventional grading sieves to obtain qualified microalloyed iron powder. The present invention only realizes the preparation of micro-alloyed iron powder from Panxi vanadium-titanium magnetite, which is rich in resources and much cheaper in price, significantly reduces the manufacturing cost of micro-alloyed iron powder, and greatly reduces the impact on high-quality iron powder when preparing high-quality iron powder. Dependence on the stability of high-quality concentrate powder. Effectively expand the utilization rate of Panxi vanadium-titanium magnetite resources, which are rich in resources, stable in quality and much cheaper in price, and obtain micro-alloyed iron powder rich in various alloying elements and excellent in performance.

Description

technical field [0001] The invention relates to a method for preparing qualified micro-alloy iron powder from primary reduced iron powder with high hydrogen loss and high carbon, and belongs to the technical field of direct reduction iron powder manufacturing. Background technique [0002] From the perspective of iron ore resources, the Panxi area is rich in vanadium-titanium magnetite resources. The proven reserves of vanadium-titanium magnetite are more than 10 billion tons, and the remaining reserves are 6.73 billion tons. Not only is the quantity huge, the quality is stable, and Vanadium-titanium magnetite is a multi-element symbiotic iron ore mainly composed of iron, vanadium and titanium elements, accompanied by cobalt, nickel, scandium, gallium and other elements. Starting from resource utilization and improving product characteristics, this makes full use of vanadium-titanium magnetite resources and its alloying elements to improve the characteristics and composition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C21B13/00
CPCC21B13/008B22F1/145
Inventor 杨雪峰林安川王涛刘晓红吴继云张宝军高顺超李秋萍游俊代将
Owner YUXI DAHONGSHAN MINING
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