Aluminum Pickling Plant Solids Separator and Filtration
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Solution Overview
Problem
Conventional pickling processes for aluminum or aluminum alloys face challenges in maintaining a stable pickling solution composition, leading to surface quality issues and increased effort due to sludge accumulation and heavy metal contamination, which affects the efficiency and quality of the pickling process.
Innovation Solution
A continuous and discontinuous adjustment of the pickling solution concentration is achieved by separating solids from the pickling bath, analyzing the composition, and adding caustic soda and additives to maintain a predetermined target composition, preventing sludge formation and heavy metal contamination within the pickling bath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pickling additives are added to improve drainage behavior and reduce drag-out, then pickling quality is improved, but heavy metals and silicates still accumulate in the pickling solution over time
Solution Approach 1:
The patent extracts and removes heavy metals and silicates from the pickling solution using a filtration system with filter elements that capture these contaminants. The filtration system continuously or periodically removes accumulated substances from the pickling bath, preventing their buildup while maintaining the beneficial additives for surface quality.
Solution Approach 2:
The patent implements a system that discards accumulated heavy metals and silicates through filtration and recovery of the cleaned pickling solution. The filtered solution is returned to the pickling bath for continued use, while the captured contaminants are disposed of, enabling long-term operation without complete solution replacement.
2Duration of action of stationary object
If the pickling solution is used for a long time to maintain aluminum concentration, then surface quality is improved, but sludge accumulates and requires frequent disposal
Solution Approach 1:
The patent implements continuous or periodic filtration of the pickling solution to remove sludge and heavy metals while the solution remains in use. This continuous cleaning action allows the pickling solution to maintain its effectiveness for extended periods without accumulating harmful contaminants that would require complete disposal and replacement.
Solution Approach 2:
The patent introduces a filtration system as an intermediary between the pickling solution and the accumulated contaminants. The filter elements act as a mediator that captures sludge, heavy metals, and silicates, allowing the pickling solution to remain in circulation and perform its function while being continuously purified.
3Manufacturing precision
If the pickling bath is drained and replaced frequently to prevent contamination, then surface quality is maintained, but operational downtime and resource consumption increase
Solution Approach 1:
The patent implements continuous in-bath filtration that operates while the pickling process continues, eliminating the need to stop production for solution replacement. The filtration system runs concurrently with pickling operations, maintaining solution quality without causing operational interruptions.
Solution Approach 2:
The patent enables the pickling system to self-clean through integrated filtration that automatically removes contaminants from the solution during operation. The system serves itself by continuously purifying the pickling solution without requiring external intervention or complete drainage for maintenance.
4Manufacturing precision
If aluminum concentration in the pickling bath is increased to improve surface quality, then pickling performance is enhanced, but the solution becomes more sensitive to contamination and requires more frequent replacement
Solution Approach 1:
The patent implements a feedback system where the pickling solution is continuously monitored for contamination levels and aluminum concentration. Based on this feedback, the filtration system adjusts its operation to maintain optimal solution composition, allowing high aluminum concentrations to be maintained stably over extended periods through active contamination control.
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 enables long-term pickling with minimal effort, maintaining high surface quality and reducing the need for frequent disposal and processing of sludge, while ensuring efficient use of resources and minimizing operational downtime.
Implementation Method 1
the aluminum on the surface of the workpiece reacts with the caustic soda according to the formula: 2Al + 6H2O + 2NaOH → 2NaAl(OH)4 + 3H2↑
Implementation Method 2
solids are separated from the picked-off portion by means of a solids separator
Data Source
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AI summary
Disclosed are a method for treating aluminum or aluminum alloy workpieces and a plant that can be operated according to such a method. According to the invention, a partial amount of a solution is withdrawn from a bath for treating the workpieces, solids are removed from said partial amount of the solution, and the partial amount of the solution is fed back to the bath at a predetermined concentration and a predetermined volume flow rate.