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Process for recovery of iron/steel from mill scales and fines

a mill scale and fine technology, applied in furnace types, manufacturing converters, furnaces, etc., can solve the problems of requiring relatively clean mill scales, high cost, and varying success, and achieve the effects of improving the efficiency of iron/steel reclamation, improving energy utilization of recovery operations, and inherent solubility of carbon

Inactive Publication Date: 2015-01-15
GLOBAL IRON & STEEL SERVICES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a process for enhancing the efficiency of recycling iron / steel from mill scales and DRI fines. It uses byproducts of iron and steel melting operations to recover base metal iron / steel from mill scale platelets and DRI fines. The recovered metal is collected at the base of the furnace as molten iron / steel. The process improves energy utilization and generates additional heat energy, leading to improved molten base metal output from earlier melting of mill scale constituents at the upper levels of a blast furnace.

Problems solved by technology

Numerous processes have been developed to treat and recycle mill scales but have met with varying success and are often costly.
These processes are very expensive, inefficient, and require relatively clean mill scale.

Method used

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  • Process for recovery of iron/steel from mill scales and fines

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Embodiment Construction

[0009]The present invention relates to a process for recovering iron / steel from scrap mill scales and fines. In embodiments of the present invention, the process includes the step of mixing of iron / steel components, such as iron / steel chips, platelets and fines (for example, pig iron fines), with coke or other carbon-containing fines to ensure maximum surface contact of all components. For example, the iron / steel components and carbon-containing components can be mixed using known industrial dry blenders to produce a homogenous mixture or substantially homogenous mixture. In another embodiment, the iron / steel components and the carbon-containing fines can be added to a container in alternating layers, in which increasing numbers of thin layers may be preferred in order to maximize contact between the iron / steel components and the carbon-containing fines. In still another embodiment, layers of containers that separately contain iron / steel components and carbon-containing fines can be...

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Abstract

A process for recovering iron / steel from scrap mill scales and fines is disclosed. A process in accordance with embodiments of the present invention comprises mixing mill scales and fines with coke or other carbon containing fines and sealing the mixture in a container. The container is charged into a cupola or blast furnace, where the components react to form molten iron / steel. The recovery process in accordance with an embodiment of the present invention is performed integral to cupola or blast furnace operations and the recovered metal is collected at the base of the furnace as molten iron / steel.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of PCT International Application No. PCT / US13 / 31189, titled “Process for Recovery of Iron / Steel from Mill Scales and Fines,” filed on Mar. 14, 2013, which claims priority to U.S. Provisional Application Ser. No. 61 / 620,498 filed on Apr. 5, 2012, each of which is incorporated herein, in its entirety, by this reference.TECHNICAL FIELD[0002]The present invention relates to a process for the recovery of iron / steel from scrap mill scales and fines, and more particularly to the refining and cooling of molten steel with mill scale particles recovered from downstream operations of a steel manufacturing process.BACKGROUND ART[0003]Steel is produced by refining hot metal from a blast furnace. After molten steel has been refined, it is solidified and then subjected to successive rolling operations during which the steel may be successively heated and cooled. During the successive heating and cooling of stee...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21B3/00C21B11/00
CPCC21B11/00C21B3/00C21B5/008Y02P10/20
Inventor HOFFMAN, HENRY H.HOFFMAN, JEFFREY J.
Owner GLOBAL IRON & STEEL SERVICES
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