Method and apparatus for recovering metal values from liquid slag and baghouse dust of an electric arc furnace

a technology of liquid slag and baghouse dust, which is applied in the direction of waste heat treatment, incrustation removal devices, charges, etc., can solve the problems of inevitably trapped residual amounts of valuable metal, high cost of disposal, and harm to the environment, and achieve the effect of lowering the cost of treatment and disposal
US20010046251A1Inactive Publication Date: 2001-11-29VALLOMY JOHN A
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
VALLOMY JOHN A
Publication Date
2001-11-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

An apparatus and method for processing liquid slag and baghouse dust from a steelmaking furnace such as an EAF to recover valuable metals from the slag and dust includes a treatment vessel having a movable lower shell portion for receiving liquid slag and an upper shell portion that couples with the movable lower shell portion during heat activation of the treatment vessel. The slag is combined with silicon dioxide, a reducing agent, baghouse dust, and an inert gas before being heated to between approximately 1400° C. and 3000° C. The heat treatment results in a molten reduced iron and manganese metallic material, a treated slag layer, and an off-gas containing lead, zinc, and carbon monoxide. The off-gas is combusted, cooled, and solidified, resulting in lead oxide and zinc oxide. The slag layer is tapped, cooled, and solidified. The metallic layer is tapped for recycle in the steel making process.
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Description

[0001] This application claims the benefit of U.S. Provisional Application No. 60 / 183,235 filed on Feb. 17, 2000.

[0002] The present invention relates to an apparatus and method for processing the liquid slag and baghouse dust waste byproducts of an electric arc furnace to recover valuable metal components therefrom. The present invention further relates to an apparatus and method for processing the liquid slag and baghouse dust byproducts of an electric arc furnace to reduce the quantity of waste byproducts.

[0003] The worldwide steel industry produces over 750 million tons of crude steel each year. The modern production of steel produces a variety of waste products which are potentially harmful to the environment and the disposal of which is costly. The most predominant of the waste products are slag and steel refining dust.

[0004] For every tonne (metric ton or 1000 kilograms) of liquid steel produced by an electric arc furnace (EAF), approximately 110 kg (kilograms) of liquid slag ...

Claims

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