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A method of using magnetic field to strengthen the direct reduction of carbon pellets in iron-containing powder

A technology with carbon pellets and magnetic field strengthening, applied in the field of iron and steel metallurgy, can solve the problems of long reduction time, high reduction temperature, low metallization rate, etc., and achieve the effect of improving production efficiency, overcoming high reduction temperature and shortening reduction time.

Active Publication Date: 2016-08-10
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems of long reduction time, high reduction temperature and low metallization rate in the direct reduction process of carbon-containing pellets existing in the prior art, and provides a new direct reduction method of strengthening internal carbon pellets under the action of a magnetic field Methods

Method used

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  • A method of using magnetic field to strengthen the direct reduction of carbon pellets in iron-containing powder
  • A method of using magnetic field to strengthen the direct reduction of carbon pellets in iron-containing powder
  • A method of using magnetic field to strengthen the direct reduction of carbon pellets in iron-containing powder

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Raw material ratio: According to the above composition table, Baiyan Obo iron ore powder is mixed with coke powder and fully mixed. The atomic ratio of fixed carbon in coke powder to iron oxide oxygen in iron ore powder is C / O is 1.2. After mixing evenly, a binder is added, the binder is water glass, and the addition amount is 5% of the total mass of raw materials.

[0037] (2) Preparation of pellets: the mixture is pressed into carbon-containing pellets with a diameter of 10-12 mm. The carbon-containing pellets are dried and used for later use. The drying method is to keep the temperature at 105° C. for 12 hours.

[0038] (3) Solid-phase reduction: spread two layers of carbon-containing pellets on a tray, place them in a magnetic field tubular reduction furnace for reduction, the reduction temperature is 950°C; the magnetic field strength is 0.97T; the reduction time is 40 min.

[0039] After the slag and iron are separated, a direct reduced iron product with a ...

Embodiment 2

[0041] (1) Raw material ratio: According to the above composition table, Baiyan Obo iron ore powder is mixed with coke powder and fully mixed. The atomic ratio of fixed carbon in coke powder to iron oxide oxygen in iron ore powder is C / O is 1.2. After mixing evenly, a binder is added, the binder is water glass, and the addition amount is 5% of the total mass of raw materials.

[0042] (2) Preparation of pellets: the mixture is pressed into carbon-containing pellets with a diameter of 10-12 mm. The carbon-containing pellets are dried and used for later use. The drying method is to keep the temperature at 105° C. for 12 hours.

[0043] (3) Reduction parameters: spread two layers of carbon-containing pellets on a tray, and place them in a tube-type reduction furnace without a magnetic field for reduction. The reduction temperature is 950° C. and the reduction time is 40 minutes.

[0044] After the slag and iron are separated, a direct reduced iron product with a metallization ...

Embodiment 3

[0046] (1) Raw material ratio: According to the above composition table, Baiyan Obo iron ore powder is mixed with coke powder and fully mixed. The atomic ratio of fixed carbon in coke powder to iron oxide oxygen in iron ore powder is C / O is 1.2. After mixing evenly, a binder is added, the binder is water glass, and the addition amount is 5% of the total mass of raw materials.

[0047](2) Preparation of pellets: the mixture is pressed into carbon-containing pellets with a diameter of 10-12 mm. The carbon-containing pellets are dried and used for later use. The drying method is to keep the temperature at 105° C. for 12 hours.

[0048] (3) Reduction parameters: Spread 2 layers of carbon-containing pellets on a tray, place them in a magnetic field tubular reduction furnace for reduction, the reduction temperature is 950°C; the magnetic field strength is 0.4T; the reduction time is 40 min.

[0049] After the slag and iron are separated, a direct reduced iron product with a metal...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and in particular relates to a method for intensifying direction reduction of iron-powder-containing internal carbon pellets by using a magnetic field. According to the method, the function of the magnetic field is introduced into an internal carbon pellet direct reduction process, the reduction reaction progress and the result of the internal carbon pellets are changed by the magnetic field, and rapid reduction at low temperature is achieved. By adopting the method provided by the invention, the defects that the reduction time is long, the reduction temperature is high, the reduction efficiency is low and the like in an internal carbon pellet direct reduction iron-making process are effectively overcome, the production process is simplified, the reduction time is greatly shortened, the cost is lowered, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for direct reduction ironmaking. Background technique [0002] Due to the shortage of coking coal resources and the rise of short metallurgical processes, the direct reduction ironmaking technology has developed rapidly in countries all over the world. Direct reduction ironmaking is a production process that reduces iron oxide in iron ore to metallic iron without melting. my country lacks high-grade iron ore, most of which need to be ground, beneficiated, and mined before being put into the furnace, and the imported iron ore is also cheap in powder form, so the use of fine ore for coal-based direct reduction is in line with my country's national conditions. [0003] At present, the technologies for producing direct reduced iron from pulverized coal mainly include rotary kiln technology, tunnel kiln technology and rotary hearth furnace techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
Inventor 金永丽赵增武李保卫代红星张雪峰
Owner INNER MONGOLIA UNIV OF SCI & TECH
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