Method and apparatus for recovering metal from electric furnace dust

A technology of dust recovery and electric furnace, applied in separation methods, chemical instruments and methods, furnaces, etc., can solve the problems of semi-melt discharge, insufficient reduction of iron components, increase heating temperature, etc., and achieve high-efficiency metal recovery and operation The effect of long-term stabilization

Inactive Publication Date: 2013-04-24
JP STEEL PLANTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in this method, iron components are not sufficiently reduced, and about 1 to 3% of zinc remains in the partially reduced iron oxide.
In order to completely reduce the iron component and separate the zinc component with high effici...

Method used

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  • Method and apparatus for recovering metal from electric furnace dust
  • Method and apparatus for recovering metal from electric furnace dust
  • Method and apparatus for recovering metal from electric furnace dust

Examples

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Embodiment

[0100] Shown below figure 1 Specific basic specifications of the device for recovering metal from electric furnace dust according to the first embodiment.

[0101] Rated electric furnace dust handling capacity: 5 tons / hour

[0102] ·Inner diameter of furnace: 4mφ

[0103] ·Power capacity: 12MVA

[0104] ·Size of secondary combustion chamber: inner diameter 2.5mφ×height 9m

[0105] Dimensions of multi-tube gas cooler: tube diameter 0.3mφ×length 7m×12 pieces

[0106] The gas volume and temperature at the outlet of the secondary combustion chamber: 6500Nm 3 / h×720℃

[0107] ·Outlet gas volume and temperature of multi-tube gas cooler: 6500Nm 3 / h×390℃

[0108] ·Bag filter inlet gas volume and temperature: 15000Nm 3 / h×180℃

[0109] ·Metal recovery capacity: 1.25 tons / hour

[0110] ·Coarse zinc oxide recovery: 2.0 tons / hour

[0111] ·ZnO in crude zinc oxide: 65~73%

[0112] ·Continuous operation time: 3 to 5 days

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Abstract

Obtained are a method and an apparatus for recovering a metal from electric furnace dust, which are capable of recovering the metal with high efficiency without causing problems such as occlusion of the apparatus. An apparatus (1) for recovering a metal from electric furnace dust of the present invention, which recovers molten iron and zinc oxide by melting and reducing electric furnace dust, which contains not less than 12% by mass of a chlorine content and a zinc content in total, mainly by electrical energy. The apparatus (1) for recovering a metal from electric furnace dust comprises: a melting/reduction furnace (3); a secondary combustion chamber (5) in which the exhaust gas from the melting/reduction furnace (3) is caused to form an upward flow at an ascending rate of 0.5-2.0 m/s (inclusive); a coarse-grained dust recovery device (7) for recovering coarse-grained dust that settles in the lower part of the secondary combustion chamber (5); and a fine dust recovery device (9) which is disposed on the exhaust gas exit side of the secondary combustion chamber (5) for the purpose of recovering fine dust.

Description

technical field [0001] The present invention relates to a method and apparatus for recovering metal from electric furnace dust generated from electric furnaces (for example, electric arc furnaces for steelmaking) that use scrap, reduced iron, pig iron, etc. as raw materials and melt and smelt them to produce steel (hereinafter referred to as "electric furnace dust") for metal component recovery. Background technique [0002] Electric furnace dust generated in electric furnaces that use iron scrap as the main raw material to manufacture steel contains 20 to 30% iron oxide, 10 to 30% zinc oxide, and 2 to 7% chlorine. [0003] In order to recover zinc components from this electric furnace dust, a rotary kiln is widely used. In the process using this rotary furnace, electric furnace dust and a reducing agent are heated in the furnace to generate metallic zinc vapor, oxidize the zinc vapor in the exhaust gas, and recover zinc as zinc oxide particles. [0004] However, in this m...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B34/34F27D17/00B01D45/02
CPCF27D17/008C22B7/02F27D17/003F27B3/085B01D45/02F27D17/004Y02P10/20C22B19/34F27D17/00
Inventor 中山道夫若原启司
Owner JP STEEL PLANTECH
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