Method for producing iron powder by directly reducing hematite or limonite

A technology for limonite and hematite, which is applied in the field of directly reducing hematite or limonite into iron powder, can solve the problems of high energy consumption, high cost, pollution and the like, and achieves avoiding large energy consumption and simplifying Effects of complex production processes

Inactive Publication Date: 2006-11-08
王号德
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Problems solved by technology

But at the same time, there are a large amount of limonite or hematite in mines in various regions. Since limonite or hematite is not magnetic and cannot be separated magnetically, only low-grade iron ore can be used through roasting pellets, blast furnaces, etc. Repeated smelting steps such as ironmaking and re-smelting billet, consume a lot of energy, high cost and serious pollution

Method used

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Embodiment Construction

[0012] The present invention adopts limonite (Fe) produced in Nanyang Township, Xiaoyi City, Shanxi Province 2 o 3 Content 46.8%), directly reduce and make iron powder according to the above-mentioned method.

[0013] The content of iron ore powder can be increased to about 52% after the sludge is washed out by the spiral concentrator. In the billet making step, the ratio of the mixture according to weight percentage is: 76% of iron ore powder, 10% of low-sulfur coke powder, 5% of quicklime, 4% of Q-type catalyst, and 5% of dolomite. The fixed carbon of the low-sulfur coke powder used is 85%, and the sulfur content is less than 0.6%.

[0014] Add water according to 5% of the weight of the mixture, mix well, and press to form a billet. In the tank oxygen barrier step, the pottery pot used is an open barrel shape with a diameter of 24 centimeters and a height of 47 centimeters. After roasting, the block taken out is ground and magnetically separated by ball mill and magnetic...

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Abstract

The process of reducing hematite or limonite without magnetic phase directly into iron powder without roasting has low power consumption and no pollution. The direct reducing process includes the following steps: crushing iron ore; water washing in a spiral separator to eliminate mud; mixing with proper amount of low sulfur coke powder, lime, Q-type catalyst and dolomite to form mixture material; crushing, adding water through stirring and making adobe with pore in an adobe making machine; filling the adobe inside earth jar and sealing with anthracite; roasting in tunnel kiln; grinding the roasted adobe in a ball mill and separating iron powder in magnetic separator.

Description

technical field [0001] The invention relates to a method for directly reducing hematite or limonite to produce iron powder. Background technique [0002] In recent years, iron ore concentrate powder, the raw material of iron and steel, is in short supply all over the world, especially in my country. But at the same time, there are a large amount of limonite or hematite in mines in various regions. Since limonite or hematite is not magnetic and cannot be separated magnetically, only low-grade iron ore can be used through roasting pellets, blast furnaces, etc. Steps such as ironmaking and resmelting billets are repeated for smelting, which consumes a lot of energy, high cost and serious pollution. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a method for directly reducing hematite or limonite into iron powder with low energy consumption and no pollution. [0004] The in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00B03C1/02B22F9/04B22F9/22C22B5/02
Inventor 王号德
Owner 王号德
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