Method for preparing primary reduction iron powder by combining inner and outer carbon matching and microwave heating

A technology of reducing iron powder and microwave heating, applied in the fields of microwave metallurgy and powder metallurgy, can solve the problems of inability to obtain heat in time, limit the rapid progress of the reaction, slow heat transfer, etc. The effect of cycle shortening

Inactive Publication Date: 2012-11-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Traditional heating is mainly carried out by conduction heat transfer, radiation heat transfer and mass transfer heat transfer. The heat transfer is slow. When the endothermic reaction is intense, the heat cannot be replenished in time, which limits the rapid progress of the reaction, which in turn makes the production cycle longer and There is a jamming situation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Raw material preparation: Iron-containing raw materials, charcoal, coal, CaCO 3 The raw materials are crushed to 150 meshes; among them, the iron-containing raw materials are powdered iron scales, and its T Fe (total iron) ≥ 71%;

[0022] (2) Fabric: layer the material prepared in step (1) into fabric: iron scale is 87.5g; the bottom layer is coal and CaCO 3 A mixture of similar raw materials, the amount of coal in this seam is 9.38g, which is 10.72% of the mass of iron-containing raw materials, CaCO 3 The mass ratio of such raw materials to the coal of this layer is 7:10, which is 6.56g; the middle layer is a mixture of charcoal and iron-containing raw materials, and the amount of charcoal taken is 12.5g, which is 14.29% of the mass of iron-containing raw materials; the upper layer is coal, and the The amount of seam coal taken is 1g, which is 1% of the mass of the middle layer mixture;

[0023] (3) Heating: heat the material laid out in step (2) to 1100°C in a ...

Embodiment 2

[0026] (1) Raw material preparation: crush iron-containing raw materials, charcoal, coal, and light-burned dolomite to 180 mesh; among them, the iron-containing raw materials are powdered iron concentrates, and their T Fe (full iron) ≥71%; fixed carbon in charcoal ≥78%, ash content ≤0.5%; fixed carbon in coal ≥70%, ash content ≤20%;

[0027] (2) Fabric: Layer the materials prepared in step (1): 85g of iron concentrate; the bottom layer is a mixture of coal and light-burned dolomite, and the amount of coal in this layer is 6.25g, which is the mass of iron-containing raw materials The mass ratio of light-burned dolomite to the seam coal is 7:10, which is 4.38g; the middle layer is a mixture of charcoal and iron-containing raw materials, and the amount of charcoal taken is 14.45g, which is 17% of the mass of iron-containing raw materials The upper layer is coal, and the amount of coal in this layer is 1.2g, which is 1.2% of the middle layer mixture quality;

[0028] (3) Heating:...

Embodiment 3

[0031] (1) Raw material preparation: crush iron-containing raw materials, charcoal, coal, and lightly burned dolomite to 200 mesh;

[0032] (2) Fabric: Layer the material prepared in step (1): 83.3g of iron-containing raw material; the bottom layer is a mixture of coal and light-burned dolomite, and the amount of coal in this layer is 4.17g, which is iron-containing raw material 5% of the mass, the mass ratio of light-burned dolomite to the seam coal is 7:10, which is 2.92g; the middle layer is a mixture of charcoal and iron-containing raw materials, and the amount of charcoal taken is 9.16g, which is 11% of the mass of iron-containing raw materials. %; the upper layer is coal, and the amount of coal in this layer is 1.85g, which is 2% of the mixture quality in the middle layer;

[0033] (3) Heating: Put the material laid out in step (2) into a microwave reactor and heat it to 1000°C, keep it warm for 60 minutes, and reduce the iron-containing raw materials by combining direct...

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PUM

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Abstract

The invention provides a method for preparing primary reduction iron powder by combining inner and outer carbon matching and microwave heating and belongs to the technical fields of microwave metallurgy and powdery metallurgy. The method comprises the following steps of: crushing raw materials including an iron-containing raw material, wood charcoal, coal and a CaCO3 raw material and carrying out layered material distribution, wherein a bottom layer is a mixture of the coal and the CaCO3 raw material, a middle layer is a mixture of the wood charcoal and the iron-containing raw material, and an upper layer is the coal; placing the distributed materials into a microwave reactor to be heated to be at 1000-1200 DEG C and keeping the heat for 5-60 minutes; and then cooling, crushing, sieving and carrying out wet type magnetic selection on reduced furnace materials, and drying to obtain the primary reduction iron powder. The method disclosed by the invention enables a process for preparing the high-grade primary reduction iron powder to be relatively reasonable; a unique material distribution manner and the rapid microwave heating are effectively combined so that the quality of primary reduction iron powder is guaranteed, the heat-preservation time is greatly shortened, the energy consumption is reduced and the production efficiency is improved; and the method can be used for rapidly producing the good-quality primary reduction iron powder.

Description

technical field [0001] The invention belongs to the technical fields of microwave metallurgy and powder metallurgy, and relates to a method for preparing primary reduced iron powder by combining internal and external carbon blending and microwave heating. Background technique [0002] Powder metallurgy technology was invented nearly 100 years ago, and it was still in its infancy until half a century ago. During World War II, the leading products of powder metallurgy were bronze and self-lubricating bearings. Iron powder also came out during this period and became a symbolic raw material for the continuous development of powder metallurgy. [0003] The types of iron powder are developed from atomized iron powder (Hametag process) to electrolytic iron powder (Husqvarna Company), and then to reduced iron powder. In 1945, magnetic separation and secondary hydrogen reduction were carried out on the primary reduced iron powder for the first time, so that the compressibility of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20
Inventor 朱红波叶乾旭彭金辉张利波代林晴陈建普靖忠
Owner KUNMING UNIV OF SCI & TECH
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