Method for cleaning aluminum seamless can and rinse water
JP2025072182A5Pending Publication Date: 2026-07-03TOYO SEIKAN KAISHA LTD +1
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TOYO SEIKAN KAISHA LTD
- Filing Date
- 2023-10-24
- Publication Date
- 2026-07-03
AI Technical Summary
Technical Problem
The existing methods for cleaning seamless aluminum cans lead to clogged filters due to the formation of aluminum and iron phosphate precipitates, resulting in reduced productivity and economic inefficiencies while increasing environmental impact.
Method used
A method involving the use of a chelating agent in the first water washing step, where the mass molar concentration of the chelating agent is adjusted between 0.1 to 0.8 relative to the sum of iron and aluminum compounds, effectively prevents the formation of sludge and maintains filter efficiency.
Benefits of technology
The proposed method effectively suppresses the generation of sludge, reduces filter clogging, and maintains productivity and economic efficiency while minimizing environmental impact.
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Abstract
To provide a method for cleaning aluminum seamless cans, which reduces environmental load, efficiently suppresses generation of sludge in waste water and does not damage productivity or economic efficiency.SOLUTION: A degreasing process, a first washing process, a surface treatment process, and a second washing process are provided at least in this order, with the cleaning water used in the first washing process being the discharge from the second washing process. In the degreasing process, a degreaser is used where the concentration of surfactant is 3500 ppm or less, the concentration of sulfate ions is 25000 ppm or less, and the concentration of iron ions is 300 ppm or higher. In the first washing process, regarding the cleaning water in the first washing process, the mass molar concentration (a) of iron compounds and iron ions from the degreasing process and the mass molar concentration (b) of aluminum compounds and aluminum ions are such that the molar concentration (c) of the chelating agent in the discharge from the second washing process supplied to the first washing process meets the condition (c) / ((a)+(b))=0.1 to 0.8.SELECTED DRAWING: Figure 1
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