Method for rapidly and directly reducing haematite or limonite into ferrous powder

A technology for limonite and hematite, which is applied in the field of rapid and direct reduction of hematite or limonite to make iron powder, can solve the problems such as the inability of iron ore to be effectively utilized, and achieves convenient mechanized operation and improved charging. The effect of increasing the amount of raw materials and expanding the source of raw materials

Inactive Publication Date: 2009-08-05
王号德
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Problems solved by technology

But at the same time, there are a large amount of ores that cannot be magnetically separated, such as hematite and limonite, in mines all over the country. Because of the lack of direct reduction into iron powder, a large amount of hematite and other iron ores cannot be effectively utilized.

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  • Method for rapidly and directly reducing haematite or limonite into ferrous powder

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Embodiment Construction

[0021] The present invention adopts limonite (Te 2 o 3 The content of 46.8%) is directly reduced to make iron powder according to the above-mentioned method.

[0022] Spiral concentrator is used for water washing, and vertical ring pulsating high-gradient magnetic separator is used for strong magnetic separation equipment. After magnetic separation, the iron ore powder content is increased to 58.6%, and then the iron ore powder, coal powder, and lime are finely ground to about -60 mesh respectively, and stored separately. Sampling test: Te 2 o 3 Content 58.6%; SiO 2 The content of 4.64%; Al 2 o 3 Content 7.1; S containing 0.12% and so on. The fixed carbon content of coal is 86%, and the S content of coal is 0.42.

[0023] According to the mechanism of internal carbon ratio, it is converted into the ratio of coal powder and limonite powder: 58.6%×27%=15.8%. The weight of coal powder is 15.8% of iron ore weight ÷ (the fixed carbon content of coal) 86%=18.37%;

[0024] ...

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Abstract

The invention relates to a method in which hematite or limonite are quickly reduced and made into iron powder, which aims to use iron ore difficult to be magnetically separated as a raw material to reduce the cost. The method is characterized in that hematite ore or limonite ore are crushed and then washed and magnetically separated; iron ore powder, coal powder and lime powder are mixed according to the proportion, and calcium fluoride and adhesive are added to be pressed into flans with pores, and the flans are dried; the structure of a kiln car surface is improved, and a sagger is made; the pressed and dried flans are hoisted to the kiln car surface after being put orderly, and the sagger is covered outside the flans; a tunnel kiln is used for calcinating the flans, and two ends of the tunnel kiln are covered with air sealing machines; after the kiln car travels out of the tunnel kiln, a motor hoist is used to hoist the sagger, calcinating blocks are pushed into a water pool to be quickly cooled and automatically ground, and the iron powder and dregs are fished out to directly enter a ball mill to be wetly milled and be pressed into blocks or bagged after the separation of a magnetic separator and the drying.

Description

technical field [0001] The invention relates to a production method of sponge iron, in particular to a method for rapidly and directly reducing hematite or limonite to make iron powder. Background technique [0002] In recent years, with the rapid development of my country's iron and steel industry, my country's high-grade iron ore concentrate powder is in serious shortage and needs to be imported in large quantities from abroad. But at the same time, there are a large amount of ores that cannot be magnetically separated, such as hematite and limonite, in mines all over the country. Because of the lack of direct reduction into iron powder, a large amount of hematite and other iron ores cannot be effectively utilized. . 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 making iron powder by rapid and direct reduction of hematite or limonite that uses iron ore th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C21B11/00B03C1/00F27B9/02F27B9/12F27B9/26F27B9/38
Inventor 王号德田丽娜
Owner 王号德
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