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A shaft furnace for efficiently controlling the magnetization of iron ore and its roasting method

A technology for magnetization roasting and iron ore, which is applied to the roasting of shaft furnaces and the field of shaft furnaces that efficiently control the magnetization of iron ore, can solve the problems of poor uniformity of ore roasting magnetization, high gas consumption, lump ore sticking, etc. Ore roasting time, increase shaft furnace output, and prevent sticking effects

Active Publication Date: 2016-08-24
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetization roasting time of the ore is as long as about 8 hours, and the gas consumption of the shaft furnace is as high as 1.3GJ / t. Especially, the lower reduction temperature causes the magnetization uniformity of the ore roasting to be poor. In order to improve the uniformity of the finished roasted ore, it is necessary to further Increase the reduction temperature of the ore, but simply increase the reduction temperature of the ore, local high temperature may appear in the furnace, and it will also cause the caking of lump ore

Method used

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  • A shaft furnace for efficiently controlling the magnetization of iron ore and its roasting method
  • A shaft furnace for efficiently controlling the magnetization of iron ore and its roasting method
  • A shaft furnace for efficiently controlling the magnetization of iron ore and its roasting method

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Embodiment 1

[0021] A shaft furnace for efficiently controlling the magnetization of iron ore, including a feeding system at the upper part of the furnace roof, a furnace body, an ore discharge system at the lower part of the furnace body and a smoke extraction system, wherein the furnace body is divided into a preheating section 1, a heating section and a reduction section 2. The middle of the heating section is the furnace 3, and the two sides of the furnace 3 are the combustion chambers 4. The combustion chambers 4 on each side are vertically divided into three layers. From top to bottom, the first layer of combustion chambers 401, the second layer of combustion chambers 402 and The third layer of combustion chamber 403, the height of the first layer of combustion chamber 401 is 0.713mm, the height of the second layer of combustion chamber 402 is 1.024mm, and the height of the third layer of combustion chamber 403 is 1.406mm. Each combustion chamber is provided with a hot burner 6 .

[...

Embodiment 2

[0024] A shaft furnace for efficiently controlling the magnetization of iron ore, including a feeding system at the upper part of the furnace roof, a furnace body, an ore discharge system at the lower part of the furnace body and a smoke extraction system, wherein the furnace body is divided into a preheating section 1, a heating section and a reduction section 2. The middle of the heating section is the furnace 3, and the two sides of the furnace 3 are the combustion chambers 4. The combustion chambers 4 on each side are vertically divided into three layers. From top to bottom, the first layer of combustion chambers 401, the second layer of combustion chambers 402 and The third layer of combustion chamber 403, the height of the first layer of combustion chamber 401 is 0.813 mm, the height of the second layer of combustion chamber 402 is 1.124 mm, and the height of the third layer of combustion chamber 403 is 1.506 mm. Each combustion chamber is provided with a hot burner 6 . ...

Embodiment 3

[0027] A shaft furnace for efficiently controlling the magnetization of iron ore, including a feeding system at the upper part of the furnace roof, a furnace body, an ore discharge system at the lower part of the furnace body and a smoke extraction system, wherein the furnace body is divided into a preheating section 1, a heating section and a reduction section 2. The middle of the heating section is the furnace 3, and the two sides of the furnace 3 are the combustion chambers 4. The combustion chambers 4 on each side are vertically divided into three layers. From top to bottom, the first layer of combustion chambers 401, the second layer of combustion chambers 402 and The third layer of combustion chamber 403, the height of the first layer of combustion chamber 401 is 0.763mm, the height of the second layer of combustion chamber 402 is 1.074mm, and the height of the third layer of combustion chamber 403 is 1.456mm. Each combustion chamber is provided with a hot burner 6 .

[...

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Abstract

The invention provides a shaft furnace for efficiently controlling the magnetization of iron ore and a roasting method thereof, which can improve the uniformity of magnetization inside and outside the ore, further shorten the roasting time of the ore, increase the output of the shaft furnace, and reduce the cost of magnetization roasting. The combustion chambers on both sides of the heating section are vertically divided into three layers, and the three-layer combustion chambers are distributed from small to large gradients from the upper part of the shaft furnace to the lower part, so as to optimize the heat energy distribution of the heating section of the shaft furnace and improve the magnetization and roasting of ore in the shaft furnace. The uniformity of the heating temperature solves the ore bonding caused by the uneven heating temperature of the ore in the furnace. The magnetization roasting temperature of iron ore is increased from about 570°C to 700°C-750°C, which provides the best magnetization roasting temperature for iron ore and improves the uniformity of magnetization roasting of ore. The ore magnetization roasting time is shortened from the original 8 hours to 5.5-6.5 hours, which improves the production capacity of the shaft furnace magnetization roasting and reduces the magnetization roasting cost.

Description

technical field [0001] The invention relates to the technical field of magnetization of iron ore in the metallurgical industry, in particular to a shaft furnace capable of efficiently controlling the magnetization of iron ore, and also relates to a roasting method of the shaft furnace capable of efficiently controlling the magnetization of iron ore. Background technique [0002] The shaft furnace is mainly a type of furnace for processing lump ore. The use of shaft furnaces for large-scale industrial magnetization roasting production was first built in Anshan, my country in 1926, so it is called "Anshan type shaft furnace". The magnetization roasting shaft furnace is to heat the ore to a certain temperature through the preheating section and the heating section in the shaft furnace, and then carry out physical and chemical reactions in the reducing atmosphere of the reducing section, so that the weakly magnetic hematite and other iron oxide minerals Magnetite transformed int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02F27B1/02F27B1/10
Inventor 王明华张志刚展仁礼权芳民马胜军李慧春郭忆张科
Owner JIUQUAN IRON & STEEL GRP
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