System and method for efficiently utilizing waste heat of flue gas of furnace to treat iron-containing resources

A flue gas waste heat and furnace body technology, applied in furnaces, hearth furnaces, furnace types, etc., can solve the problems of long pretreatment process, clogging of side wall burners, large equipment investment, etc., so as to reduce production costs and equipment. The effect of investment, shortening of pretreatment process, and high equipment operation rate

Inactive Publication Date: 2016-12-21
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, the pretreatment process of the existing rotary hearth furnace is long, and the equipment investment is relatively high
In the existing technological process for treating iron-containing resources in a rotary hearth furnace, the prepared water-containing pellets need to be dried and then put into the rotary hearth furnace for reduction. The reason is: undried water-containing pellets (generally more than 13% ) if it is directly put into the furnace, it will be broken under high temperature conditions and a large amount of dust will be generated at the initial stage of the furnace. go straight
It can be seen that the "drying" link is a necessary pretreatment step for the existing rotary hearth furnace combustion system, but this has led to the defects of long pretreatment process before the rotary hearth furnace, large equipment investment, and high energy consumption, which needs further improvement

Method used

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  • System and method for efficiently utilizing waste heat of flue gas of furnace to treat iron-containing resources
  • System and method for efficiently utilizing waste heat of flue gas of furnace to treat iron-containing resources

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Embodiment 1

[0055] Use 20.4% TFe and laterite nickel ore containing Ni1.53% as the raw material, first crush the raw material to less than 2mm, the reducing agent is lignite with a fixed carbon content of 58%, the addition amount is 1.1 times of the theoretical addition amount, and the limestone The amount of addition is 10% of the weight of laterite nickel ore for mixing-briquetting. The moisture content of the hydrous pellets is 17%. The pressed hydrous pellets are directly placed into the rotary hearth furnace for drying-reduction treatment. The drying area of ​​the rotary hearth furnace adopts drying The heat source of the drying pipe device comes from the high-temperature flue gas discharged from the flue of the rotary hearth furnace. The high-temperature flue gas discharged from the flue of the rotary hearth furnace is sent into the flue gas inlet of the drying pipe, and then discharged from the flue gas outlet of the drying pipe; The reduction zone is heated by burners; the included...

Embodiment 2

[0057] Use 20.4% TFe and laterite nickel ore containing Ni1.53% as raw material, first crush the raw material to less than 1mm, the reducing agent is lignite with fixed carbon content of 58%, and the addition amount is 1.2 times of the theoretical addition amount, limestone The amount of addition is 10% of the weight of laterite nickel ore for mixing-briquetting. The moisture content of the hydrous pellets is 17%. The pressed hydrous pellets are directly placed into the rotary hearth furnace for drying-reduction treatment. The drying area of ​​the rotary hearth furnace adopts drying The heat source of the drying pipe device comes from the high-temperature flue gas discharged from the flue of the rotary hearth furnace. The high-temperature flue gas discharged from the flue of the rotary hearth furnace is sent into the flue gas inlet of the drying pipe, and then discharged from the flue gas outlet of the drying pipe; The reduction zone is heated by burners; the included angle of ...

Embodiment 3

[0059] Choose TFe content 57.10%, TiO 2 Content 12.94%, V 2 o 5 Vanadium-titanium sea sand with a content of 0.67 is used as raw material, and the reducing agent is carbon black obtained by pyrolysis of solid waste. The water content of the pellets is 14%, and the water-containing pellets are directly distributed into the rotary hearth furnace for drying-reduction treatment. The drying area of ​​the rotary hearth furnace is heated by a drying tube device. The heat source of the drying tube device comes from the high temperature discharged from the flue of the rotary hearth furnace. Flue gas, the high-temperature flue gas discharged from the flue of the rotary hearth furnace is sent into the flue gas inlet of the drying pipe, and then discharged from the flue gas outlet of the drying pipe; the reduction area is heated by a burner; the angle of the ring in the drying area is 50°, The included angle of the circular ring is 260°; the minimum temperature in the drying zone is 90...

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Abstract

The invention relates to the field of chemical metallurgy, in particular to a system and method for processing iron-containing resources. Aiming at the deficiencies of the prior art, the present invention proposes a system and method for efficiently utilizing waste heat of furnace flue gas to treat iron-containing resources. The system and method improve the heating mode of the rotary hearth furnace, on the one hand, make the flue gas of the rotary hearth furnace The waste heat can be reused inside the rotary hearth furnace, which improves the utilization efficiency of the waste heat of the flue gas in the rotary hearth furnace. The technological process reduces equipment investment, and the invention has the advantages of high flue gas waste heat utilization rate, short treatment process, low equipment investment, high equipment operation rate, low energy consumption, and wide application range.

Description

technical field [0001] The invention relates to the field of chemical metallurgy. In particular, the present invention relates to a system and method for processing ferrous resources. Background technique [0002] The rotary hearth furnace is a metallurgical industrial furnace with a ring-shaped hearth and a rotatable bottom. The inside of the furnace body is radiant heat transfer. Generally, the burner burns gas or natural gas to increase or maintain the temperature of the hearth. It is used to process iron-containing materials. And cooperate to extract nickel, zinc, chromium and other valuable metal elements. Rotary hearth furnace coal-based direct reduction method has been developed rapidly in recent years due to its fast reaction speed and strong adaptability of raw materials. Iron metallurgical slag, red mud and other iron-containing resources. But at the same time, the existing rotary hearth furnace equipment has the following disadvantages: [0003] On the one han...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/10
CPCC21B13/105
Inventor 王静静李红科宋文臣曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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