On-Site Aluminum Slag Processing System for Salt Recovery
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Solution Overview
Problem
Centralized processing of slags from molten aluminum furnaces incurs high transport costs, regulatory issues, safety risks, and energy inefficiencies, and results in variable and poorly controlled salt products due to the cold and heterogeneous nature of the slag upon arrival at processing plants.
Innovation Solution
Implementing a method and apparatus for on-site processing of slags at the furnace location, involving leaching, drying, and pelletizing of the slag before it cools below 760°C, using a system that includes leaching apparatus, dryers, and compression/moulding equipment within 5 km of the furnace to produce consistent and valuable salt products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centralized processing plants are used to process slags, then processing capacity is improved, but transport costs and transport footprint increase
Solution Approach 1:
The centralized processing system is segmented into distributed on-site processing units. Each furnace site receives a compact processing system that can handle slag locally, eliminating the need to transport large volumes of cold slag to centralized plants. This segmentation resolves the contradiction by maintaining processing capability while dramatically reducing transport requirements.
Solution Approach 2:
The invention changes the spatial dimension of processing by moving from a centralized location to distributed on-site locations. Instead of concentrating processing capacity in one place, the system distributes processing units across multiple furnace sites, transforming the organizational structure from centralized to decentralized while maintaining or improving overall productivity.
2Productivity
If centralized processing plants are used to process slags, then processing capacity is improved, but regulatory issues and safety risks increase
Solution Approach 1:
By segmenting the processing system into small on-site units, the invention eliminates the need for long-distance transport of hazardous materials, thereby reducing regulatory compliance requirements and safety risks associated with transporting cold slag across borders or through multiple jurisdictions.
3Ease of operation
If slags are processed after cooling, then transport is easier, but energy efficiency decreases and product quality deteriorates
Solution Approach 1:
The invention performs processing actions while the slag is still warm (above ambient temperature), before complete cooling occurs. This preliminary processing approach eliminates the need to reheat the slag later, saving energy, while also maintaining better material properties for product quality. The system is designed to handle warm slag directly, making transport and processing equally efficient.
4Ease of operation
If slags are processed after cooling, then transport is easier, but manufacturing precision of salt product decreases
Solution Approach 1:
The processing operations are performed preliminarily while the slag is still warm, preserving the material's plasticity and reactivity. This timing ensures better control over the chemical composition and physical properties of the resulting salt product, achieving higher manufacturing precision compared to processing cold, heterogeneous slag.
5Weight of moving object
If on-site processing is implemented, then transport costs are reduced, but device complexity increases
Solution Approach 1:
The on-site processing system is designed as a universal, multi-functional unit that can be deployed at various furnace locations. The compact design integrates multiple processing functions into a single modular system, reducing the need for complex infrastructure while maintaining effective slag processing capabilities.
Solution Approach 2:
The processing system is designed to be self-contained and self-sufficient, requiring minimal external infrastructure or support systems. This self-service capability reduces the overall system complexity while enabling independent operation at each furnace site, thereby reducing transport costs without proportionally increasing device complexity.
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 reduces transport costs and regulatory burdens, enhances energy efficiency, and produces salt products with controlled chemical composition and size distribution, improving their value and usability in aluminum recycling processes.
Implementation Method 1
feeding the material to a leaching step; obtaining a leachate from the leaching step
Implementation Method 2
feeding the leachate to a drying step or spray drying step; obtaining a solid from the drying step or spray drying step
Data Source
AI summary
Methods and apparatus for processing a material, the material being the upper layer from a metal melting process, the material containing one or more salts, the material containing one or metals, are provided. The method includes feeding the material to a size reduction step; feeding the material from the size reduction step to a density based separation step; feeding the material from the density based separation step to a leaching step. The size reduction stage is optimised to provide exposure of material for a ferrous and non-ferrous metal separation. The ferrous separation is preferably provided by an eddy current separator. The non-ferrous separation is preferably provided by a cyclone.