Scrap Classification Plant Using Chemical Analysis for Furnace Charging
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Solution Overview
Problem
Current scrap classification methods in steel plants are inadequate as they primarily focus on size and weight, failing to account for the chemical composition, leading to impurities like copper and tin entering the metal bath and affecting product quality.
Innovation Solution
A plant and method that includes a shear, a downstream analyser for chemical composition, and transport means with vibrating conveyors to separate scrap into fractions based on chemical composition, using XRF, LIBS, or neutron activation analysis to identify elements like Cu, Sn, Zn, P, Mo, Ni, and Mn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scrap is classified only by size and weight, then the classification process is simple and fast, but the chemical composition cannot be controlled leading to impurities in the metal bath
Solution Approach 1:
The scrap classification system is segmented into multiple stages: initial sorting by size and weight, followed by chemical composition analysis using spectrometry, and final separation into fractions based on composition. This segmentation allows the system to handle complex chemical analysis without overwhelming the entire process at once.
Solution Approach 2:
The patent replaces manual or simple mechanical classification methods with automated spectrometric analysis systems. The spectrometer provides precise chemical composition measurement, substituting mechanical sorting alone with a scientific measurement approach that enables accurate chemical control.
2Reliability
If scrap is analyzed by chemical composition, then product quality is improved by removing impurities, but the analysis time and cost increase
Solution Approach 1:
Chemical composition analysis is performed on scrap before it enters the metal bath, allowing impurities to be identified and separated in advance. This preliminary action prevents quality issues from arising during production and allows for timely separation of scrap into appropriate fractions.
Solution Approach 2:
The spectrometric analysis is integrated into the continuous scrap processing flow, allowing chemical composition to be determined without interrupting the overall operation. The system continuously analyzes scrap as it is fed through the classification mechanism, maintaining productive action while ensuring quality control.
3Manufacturing precision
If scrap is separated into multiple chemical fractions, then the accuracy of metal bath composition is improved, but the complexity of the discharge and sorting system increases
Solution Approach 1:
The discharge system uses movable partitions or gates that can be dynamically positioned to direct different scrap fractions to appropriate collection areas. This dynamic control allows the system to adapt to varying scrap compositions and routing requirements without requiring separate fixed infrastructure for each fraction type.
Solution Approach 2:
The patent introduces an intermediary control system that manages the discharge process based on spectrometric analysis results. This intermediary layer coordinates the sorting action, interpreting chemical composition data and controlling the discharge mechanisms to ensure accurate fractionation without requiring direct complex mechanical coupling between all components.
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
Enables precise classification of scrap, minimizing undesirable elements, optimizing charge mixtures, and ensuring compliance with regulatory requirements for steel production by accurately determining and segregating scrap based on chemical composition.
Implementation Method 1
using XRF, LIBS, or neutron activation analysis to identify elements like Cu, Sn, Zn, P, Mo, Ni, and Mn
Implementation Method 2
using XRF, LIBS, or neutron activation analysis to identify elements like Cu, Sn, Zn, P, Mo, Ni, and Mn
Implementation Method 3
using XRF, LIBS, or neutron activation analysis to identify elements like Cu, Sn, Zn, P, Mo, Ni, and Mn
Implementation Method 4
transport means with vibrating conveyors to separate scrap into fractions based on chemical composition
Data Source
AI summary
The invention is related to a plant for the classification of scrap according to its chemical composition. The plant contains a shear adapted to cut scrap; downstream of the shear an analyser of the chemical composition of the sheared material; means of transport, comprising a plurality of vibrating feeders and conveyors to transport the sheared material to the analyser; and a discharge system adapted to divide the material analysed according to its chemical composition. The shearing in a related method is followed by chemical analysis of the sheared material which allows its division into fractions of sheared scrap with different chemical compositions. The invention helps to optimise the feeding of melting furnaces with different types of scrap which are distinguished, for example, by their copper content.