Neutralized Fluoride Accelerator for Aluminum Can Cleaning
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Solution Overview
Problem
The aluminum can manufacturing industry faces challenges in safely removing aluminum fines and lubricants from container surfaces, as existing acidic wash solutions require handling hazardous compounds like hydrogen fluoride or ammonium bifluoride, posing significant health risks to workers.
Innovation Solution
A multi-stage washing method is introduced, where a neutralized fluoride-containing accelerator solution is added to an acidic wash stage with no fluoride ions, supplying 3 to 15 ppm fluoride ions without altering the pH, thereby reducing the toxicity of the washing process and minimizing exposure to hazardous compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen fluoride or ammonium bifluoride are added to acidic wash solutions to remove aluminum fines and maintain can brightness, then the cleaning effectiveness and color preservation are improved, but worker safety deteriorates due to exposure to extremely hazardous and possibly fatal compounds
Solution Approach 1:
The patent extracts and removes the hazardous hydrogen fluoride and ammonium bifluoride components from the wash solution formulation. Instead of using these toxic compounds, the invention employs alternative cleaning agents that achieve the same aluminum fine removal and brightness maintenance without the fatal exposure risks to workers.
Solution Approach 2:
The patent introduces intermediary substances that serve as substitutes for the hazardous fluoride compounds. These intermediary cleaning agents perform the deoxidizing and brightening functions previously accomplished by hydrogen fluoride and ammonium bifluoride, but without the extreme toxicity and worker safety hazards.
2Reliability
If conventional acidic wash methods are used to remove lubricants and forming oils, then the surface cleanliness is improved, but the process complexity and hazard control requirements increase
Solution Approach 1:
The patent removes the need for complex multi-stage processes with hazardous chemicals by extracting only the essential cleaning function. The simplified wash solution achieves effective removal of lubricants and forming oils without requiring the complex control systems and safety infrastructure needed for conventional acidic methods.
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 effectively removes contaminants from aluminum containers while significantly reducing the toxicity of the washing process, ensuring worker safety and maintaining the color and brightness of the aluminum cans.
Implementation Method 1
adding to an acidic wash stage solution having no fluoride ions and having a pH≤2.5 a neutralized fluoride-containing accelerator solution in an amount sufficient to supply the resulting wash stage solution with a range of between and including 3 to 15 ppm fluoride ion
Implementation Method 2
Acid cleaners have been employed to clean the aluminum surfaces and to remove aluminum fines deposited on the interior walls of aluminum containers
Data Source
AI summary
A composition, kit and method useful in a multi-stage washing method for cleaning an aluminum or aluminum alloy containers while reducing hazardous exposure of workers to toxic levels of hydrogen fluoride or ammonium bifluoride employs a stable, neutralized ammonium bifluoride-containing accelerator solution for addition to an acidic wash solution.