Process for preparing Fe alloy powder by reducing Fe scales generated by rolling steel and Fe concentrate

A technology for iron concentrate and alloy iron, which is applied in the field of reducing and rolling iron scale and iron concentrate to prepare alloy iron powder, can solve the problems of high energy consumption, long reduction time and high reduction temperature, and achieves protection of the environment, reduction of energy consumption, short time effect

Inactive Publication Date: 2004-11-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction time of this process is long, the reduction temperature is high, and the energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix 16kg of iron ore concentrate (TiO2 content is 12.73%) with 144kg of rolled steel scale and 5kg of coke to obtain a reducing material (particle size less than 40 mesh), and mix 80kg of coke and 30kg of calcium carbonate to obtain a reducing agent (particle size of less than 20 mesh) . The reducing agent and the reducing material are placed in an alumina crucible in a ring-shaped vertical phase, and the crucible is sealed with refractory mud and put into the furnace. After 2 hours of heat preservation and drying at 300-500°C, the temperature is raised to 800°C in one hour, and then to 800°C in one hour. 1100°C, stop heating after 5 hours of heat preservation, take out the crucible when the furnace temperature drops to about 850°C, take out the reduced sponge iron ingot after cooling to room temperature, remove impurities, and after crushing, magnetic separation, and ball milling, use it in a tube furnace Hydrogen secondary reduction, the reduction temperature is 850°C...

Embodiment 2

[0018] Mix 38kg of iron ore concentrate, 113kg of rolled steel scale, 5kg of coke and 2kg of calcium carbonate to obtain a reducing material (with a particle size of less than 40 mesh), and mix 80kg of coke and 25kg of calcium carbonate to obtain a reducing agent (with a particle size of less than 20 mesh). The reducing agent and the reducing material are placed in an alumina crucible in an annular vertical phase, and the crucible is sealed with refractory mud and put into the furnace. After heat preservation and drying at 300-500°C for 2 hours, the temperature is raised to 800°C in one hour, and then to 800°C in one hour. 1100°C, stop heating after 5 hours of heat preservation, take out the crucible when the furnace temperature drops to about 800°C, take out the reduced sponge iron ingot after cooling to room temperature, remove impurities, and after crushing, magnetic separation, ball milling, use in a tube furnace Hydrogen secondary reduction, the reduction temperature is 80...

Embodiment 3

[0020] Mix 23kg of iron ore concentrate (containing titanium, vanadium, manganese and other alloying elements), 128kg of rolled steel scale, 5kg of coke and 2kg of calcium carbonate to obtain a reducing material (particle size less than 40 mesh), and mix 80kg of coke and 30kg of calcium carbonate to obtain a reduction agent (particle size less than 20 mesh). The reducing agent and the reducing material are placed in an alumina crucible in a ring-shaped vertical phase, and the crucible is sealed with refractory mud and put into the furnace. After 2 hours of heat preservation and drying at 300-500°C, the temperature is raised to 800°C in one hour, and then to 800°C in one hour. 1100°C, stop heating after 5 hours of heat preservation, take out the crucible when the furnace temperature drops to about 800°C, take out the reduced sponge iron ingot after cooling to room temperature, remove impurities, and after crushing, magnetic separation, ball milling, use in a tube furnace Hydrog...

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Abstract

A process for preparing Fe alloy powder by reducing the iron ore concentrate and the iron and steel scales generated by rolling includes charging reducing agent (coke and lime stone), said iron and steel scales, iron ore concentrate, coke and calcium carbonate into refractory pot, drying, heating to 1000-1200 deg.C, maintaining the temp, cooling, and secondary reduction by introducing hydrogen gas. The resultant has better alloy strengthening action on iron powder.

Description

technical field [0001] The invention relates to a method for preparing alloy iron powder by reducing rolled steel scale and iron concentrate, and belongs to the field of powder metallurgy powder making technology. Background technique [0002] High-performance iron powder and alloy iron powder have a wide range of applications, but the contradiction between supply and demand is very prominent, which cannot meet the needs of the society, and there are problems such as few varieties, low labor productivity, and high cost. A variety of high-performance iron powders and alloy iron powders are prepared by reduction of rolled steel scale and iron concentrate, which has low energy consumption and high labor productivity, and utilizes rolled steel scale, a high-quality secondary resource, to protect the environment. [0003] The Swedish Hegnas company etc. adopt the reduction method to produce iron powder, and its basic principle is: at first the iron concentrate of purification and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/18C21B13/04
Inventor 梁开明于川胡安民
Owner TSINGHUA UNIV
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