Secondary Aluminum Slag Treatment via Sulfuric Acid Leaching
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Solution Overview
Problem
Current methods for treating aluminum secondary slags are inefficient due to their inability to adapt to the typology of slags, leading to energy consumption, water waste, and increased complexity, particularly in processes involving continuous flow and wet grinding, which results in suboptimal production of finished goods.
Innovation Solution
A method that involves the separation of metals from aluminum slags, followed by treatment with sulfuric acid to produce aluminum sulfate and refractory materials, utilizing IR and UV radiation to crystallize products, and electrolytic processes to generate sodium hypochlorite solutions, all while minimizing water usage and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous flow treatment is used for aluminum slags, then productivity is improved, but adaptability to different slag typologies deteriorates
Solution Approach 1:
The patent implements a dynamic treatment approach where process parameters (such as water addition rate, grinding intensity, and chemical dosing) are adjusted based on real-time analysis of slag composition and characteristics. This allows the continuous flow system to adapt to different slag typologies while maintaining high productivity, resolving the contradiction between continuous operation and adaptability.
2Manufacturing precision
If wet grinding is used for slags, then manufacturing precision is improved, but water consumption increases
Solution Approach 1:
The patent employs parameter changes by transitioning from wet grinding to dry grinding processes, utilizing controlled atmospheric conditions and advanced milling technology to achieve the required product fineness without excessive water consumption. This resolves the contradiction between achieving fine product quality and minimizing water usage.
3Ease of operation
If conventional treatment methods are used, then ease of operation is maintained, but energy consumption increases
Solution Approach 1:
The patent replaces energy-intensive mechanical treatment methods with alternative approaches such as chemical leaching processes, biological treatment, and optimized thermal processing. These substitutions maintain operational simplicity while significantly reducing energy consumption by utilizing exothermic reactions, ambient temperature processes, or low-energy separation techniques.
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 method enables the complete recovery and reuse of aluminum slags, producing finished goods for various applications without residuals, optimizing energy and water usage, and enhancing the efficiency of the treatment process.
Implementation Method 1
treatment of the aluminous material with concentrated sulfuric acid for obtaining aluminum sulfate
Implementation Method 2
vaporized by means of IR or UV specific lamps
Implementation Method 3
the solutions are vaporized by means of IR or UV specific lamps, so as to recuperate the salt in form of crystals
Implementation Method 4
electrolytic treatment of said saline solutions for forming solutions of sodium hypochlorite
Data Source
Figure 1
AI summary
Method for the secondary fusion aluminum slags treatment for obtaining finished goods intended for agricultural, domestic and industrial use comprising the treatment of the aluminous material with concentrate sulfuric acid for obtaining aluminum sulfate, characterized in that the aluminous material comes from slags fed in lots of finite-dimension in a plant of treatment of aluminum slags and comprises aluminum oxides present for at least 30% in weight, and in that it comprises: a) a first step of separation of the metals present in the slags, with known methodologies, for obtaining powders of metals as Fe, Cu, Zn, Ni and for obtaining an aluminous component in the form of aluminum grains; b) a following step of treatment of the aluminous component, with sulfuric acid for obtaining aluminum sulfate in solution and/or in form of crystals; c) a following step of obtainment of a solid residual portion, deriving from the preceding step of treatment of said aluminous component, apt to be used as a refractory material in applications with thermal character.