Aluminium Scrap Comminution for Optical Sorting Purity
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Solution Overview
Problem
Existing methods for producing aluminium secondary raw material from scrap are time- and cost-intensive, and struggle to achieve high purity and efficiency, often requiring complex processes and extensive comminution, which can lead to equipment demands and limitations in material throughput.
Innovation Solution
A method involving carefully controlled comminution with adjusted shredder process parameters to produce a particle size distribution with an intermediate fraction for optical analysis, allowing for high-quality aluminium scrap production using a single-stage process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extensive comminution is used to obtain sufficiently small particle sizes, then the scrap can be well-dispersed and well-comminuted for optical analysis, but the process becomes time- and cost-intensive with reduced material throughput
Solution Approach 1:
The patent changes the particle size parameter from requiring uniformly small particles to accepting a broad distribution with emphasis on intermediate sizes (40-130 mm), thereby reducing comminution intensity and increasing throughput while maintaining analysis capability
Solution Approach 2:
Instead of over-comminuting all particles to small sizes, the patent applies partial comminution to achieve a broad distribution, focusing optical analysis only on the intermediate fraction where aluminium-rich particles are concentrated, thus reducing overall processing time and cost
2Manufacturing precision
If multi-stage shredding processes are used to produce pure aluminium scrap, then the desired degree of purity can be achieved, but the process complexity and equipment requirements increase significantly
Solution Approach 1:
The patent extracts the intermediate particle fraction (40-130 mm) from the comminuted composition for optical analysis, separating this fraction where aluminium-rich particles are concentrated from smaller and larger particles that are less likely to meet quality criteria, thereby simplifying the process while maintaining purity
Solution Approach 2:
The patent replaces complex multi-stage mechanical shredding with a single-stage comminution followed by optical detection and separation, substituting mechanical complexity with optical analysis to achieve the same purity goal more efficiently
3Manufacturing precision
If optical detection devices process large quantities of comminuted material, then sufficiently high removal rates for non-aluminium particles can be achieved, but the equipment requirements and investment costs increase
Solution Approach 1:
The patent extracts and analyzes only the intermediate particle fraction (40-130 mm) which contains the concentrated aluminium-rich particles, rather than processing all comminuted material, thereby reducing the quantity requiring optical detection while maintaining high purity
Solution Approach 2:
The patent applies optical detection locally to the intermediate fraction where aluminium-rich particles are most likely to be found, rather than uniformly processing all particle sizes, optimizing detection efficiency and reducing equipment requirements
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 approach increases product purity, reduces the need for optical detection devices, and enhances process automation and throughput, producing high-quality aluminium scrap suitable for demanding applications like car body sheets.
Implementation Method 1
comminuting the aluminium-containing scrap composition in a comminution unit to obtain a comminuted composition
Implementation Method 2
analysing particles of the comminuted composition with at least one optical detection device to detect at least one material information for the particles
Data Source
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AI summary
The invention relates to a method for producing an aluminium secondary raw material composition, comprising the steps: a) producing or providing an aluminium-containing scrap composition, wherein the aluminium-containing scrap composition comprises: a1) a plurality of first scrap subvolumes consisting of a first metallic material with an aluminium content of 85 % or more, and a2) a plurality of second scrap subvolumes consisting of a second metallic material with an aluminium content of less than 85 %, b) comminuting the aluminium-containing scrap composition using predefined comminuting parameters, wherein the comminuted composition: i) first particles with an equivalent sieve diameter of less than 40 mm, ii) second particles with an equivalent sieve diameter in the range of 40 to 130 mm, and iii) third particles with an equivalent sieve diameter of more than 130 mm, wherein the predefined comminuting parameters are chosen so that 60 % or more of the first metallic material that is leaving the comminution unit is comprised by second particles, d) analysing particles of the comminuted composition with a optical detection device to detect a material information for the particles, wherein a mass fraction of more than [X] of the analysed particles are second particles, wherein [X] is the mass fraction of the second particles in the comminuted composition, and e) separating particles for that the material information does not meet a predefined quality criterion.