Continuous Scrap Steel Copper Removal via Multi-Separation
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Solution Overview
Problem
Conventional methods for separating non-ferrous metals from shredded scrap steel are labor-intensive and costly, making it economically challenging to produce steel sheet with low copper content without diluting the scrap steel with pig iron or direct reduced iron.
Innovation Solution
A continuous multi-separation process involving a series of separators, including ballistic, electromagnetic, and eddy current separators, to separate and combine shredded scrap steel fractions, reducing copper content to less than 0.20 weight percent, and introducing the product to an electric arc furnace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional labor-intensive separation methods are used, then non-ferrous metals can be removed from scrap steel, but operating costs increase and productivity decreases
Solution Approach 1:
The patent replaces manual labor with automated detection and separation systems. Gamma-ray spectroscopy detectors automatically identify non-ferrous metals, and electromagnetic separators mechanically remove them without human intervention, thereby maintaining separation effectiveness while dramatically improving productivity and reducing operating costs.
Solution Approach 2:
The system enables scrap steel to be self-sorted through automated detection and separation. The scrap stream continuously passes through detectors and separators that automatically identify and remove non-ferrous metals based on their atomic number characteristics, eliminating the need for manual picker intervention and enabling continuous high-speed processing.
2Loss of information
If Gamma-Tech scrap analyzers are used, then real-time feedback is provided to manage feedstock, but capital costs increase and sorting capabilities are not provided
Solution Approach 1:
The patent combines Gamma-Tech scrap analyzers with electromagnetic separation equipment into an integrated system. The analyzer provides real-time feedback on non-ferrous metal content, and the electromagnetic separator immediately acts on this information to remove contaminants, merging detection and sorting functions into a single continuous process that reduces both capital costs and information loss.
Solution Approach 2:
The system maintains continuous operation by keeping the scrap steel stream moving continuously through the detection and separation zones. The Gamma-Tech analyzer continuously monitors non-ferrous metal content, and the electromagnetic separator continuously removes contaminants without interrupting the feedstock flow, ensuring uninterrupted real-time feedback and action.
3Quantity of substance
If scrap steel with high copper content is used, then feedstock availability is maintained, but steel sheet production quality deteriorates
Solution Approach 1:
The patent extracts non-ferrous metals including copper from the scrap steel stream using electromagnetic separation. The system identifies copper-containing materials based on their atomic number characteristics detected by Gamma-ray spectroscopy, then uses electromagnetic forces to separate and remove these contaminants, thereby maintaining scrap steel availability while achieving precise copper content control below 0.20%.
4Manufacturing precision
If pig iron or direct reduced iron is blended to reduce copper content, then steel sheet quality is improved, but production costs and time increase
Solution Approach 1:
The patent performs copper removal as a preliminary action before the scrap steel enters the electric arc furnace. By continuously separating non-ferrous metals from the scrap stream in advance, the system delivers pre-cleaned scrap steel with controlled copper content, eliminating the need for time-consuming blending operations with pig iron or direct reduced iron and reducing overall processing time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process significantly reduces operating costs, improves supply chain flexibility, and provides a low copper scrap steel product suitable for steel sheet production while minimizing greenhouse gas emissions from electric arc furnace processes.
Implementation Method 1
ballistic separator to separate a first shredded scrap steel fraction from an amount of shredded scrap steel
Implementation Method 2
separating a second fraction from the amount of shredded scrap steel
Implementation Method 3
separating the second fraction and providing a nonmagnetic fraction and, concurrently, a third shredded scrap steel fraction
Implementation Method 4
electromagnetic separator
Implementation Method 5
eddy current separators to separate and combine shredded scrap steel fractions
Implementation Method 6
eddy current separator
Implementation Method 7
introducing the combined shredded scrap steel product to an electric arc furnace
Data Source
AI summary
Methods of reducing copper metal content of shredded scrap steel are provided. The method includes continuously separating a first scrap steel fraction from an amount of scrap steel concurrently with separating a second fraction from the amount of scrap steel; continuously separating the second fraction and providing a nonmagnetic fraction and, concurrently, a third scrap steel fraction; grinding the nonmagnetic fraction followed by magnetic separation to provide a fourth scrap steel fraction and, concurrently, an enriched nonmagnetic fraction; continuously combining the first scrap steel fraction, the third scrap steel fraction, and the fourth scrap steel fraction to obtain a combined scrap steel product comprising scrap steel with reduced copper metal content; and introducing the combined scrap steel product to an electric arc furnace. Systems of reducing copper metal content of shredded scrap steel are also provided.