Method for preparing qualified microalloy iron powder through high-hydrogen-loss high-carbon primary reduced iron powder

A technology of micro-alloyed iron powder and reduced iron powder, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high resource dependence, strong stability, hydrogen loss and low carbon content, and achieve the expansion of rich resources, The effect of suppressing the increase of hydrogen loss and reducing the overall manufacturing cost

Active Publication Date: 2016-08-24
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 0.025%, CaSO 4 0.25%, SiO 2 0.025%.

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

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 0.031%, CaSO 4 0.27%, SiO 2 0.020%.

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

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 0.029%, CaSO 4 0.23%, SiO 2 0.022%.

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

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Abstract

The invention discloses a method for preparing qualified microalloy iron powder through high-hydrogen-loss high-carbon primary reduced iron powder. The high-hydrogen-loss high-carbon primary reduced iron powder is heated and dried, the balanced and stable distribution amount, the agglomeration grain and the surface flatness and smoothness are controlled, the iron powder is fed into a secondary refining reduction steel belt furnace for refining reduction, and the temperatures of 1-10 deoxygenation zones and decarburization zones are adjusted from low to high according to the decarburization and deoxygenation effects; and iron blocks at a secondary refining reduction outlet are crushed, and the qualified microalloy iron powder is obtained through a conventional classifying screen. Preparation of the microalloy iron powder through Panxi vanadium titano-magnetite with abundant resources and relatively low price is achieved, the preparation cost of the microalloy iron powder is remarkably reduced, and the dependence on high-stability high-quality concentrate fines for preparing high-quality iron powder is greatly lowered. The utilization rate of the abundant Panxi vanadium titano-magnetite resource with stable quality and the relatively low price is effectively increased, and the microalloy iron powder which is rich in various alloying elements and good in performance is obtained.

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 Applications(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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