Wet Purification Drum Cleaning for Bubble-Free Recycled Silicon
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Solution Overview
Problem
Existing crystalline silicon recycling methods face challenges in effectively removing impurities and bubbles adhering to the surface of silicon fragments due to their hydrophobicity, leading to poor cleaning efficiency and energy consumption.
Innovation Solution
A cleaning device with multiple tanks, vacuum pumps, and rotating drums and impellers is used to separate bubbles and enhance contact between silicon fragments and cleaning agents, utilizing pressure differences and rotating bristles to improve mixing and cleaning efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic solvents are used to dissolve EVA and chemical reagents are used to dissolve impurities, then the dissolving effect is improved and contact area between silicon wafer and reagents is increased, but bubbles adhere to the depressions of silicon fragments forming unreachable areas that cause poor cleaning effect
Solution Approach 1:
The patent employs ultrasonic vibration to generate cavitation bubbles that collapse and produce shock waves, mechanically disrupting and removing the hydrophobic bubbles adhering to silicon fragment surfaces and depressions, thereby eliminating unreachable areas and improving cleaning quality
Solution Approach 2:
The patent introduces gas-liquid two-phase flow and uses pressure differential technology to facilitate bubble detachment from silicon fragment surfaces, leveraging fluid dynamics to overcome hydrophobic adhesion and enhance cleaning effectiveness
2Manufacturing precision
If silicon wafer is crushed to increase contact area with chemical reagents, then dissolving effect is improved, but more energy is consumed and organic impurities remain on the surface affecting subsequent use
Solution Approach 1:
The patent changes the physical and chemical parameters of the cleaning process by using ultrasonic frequency vibrations and optimized chemical reagent combinations, achieving effective impurity removal without requiring excessive mechanical crushing, thereby reducing energy consumption while maintaining high purity
Solution Approach 2:
The patent employs composite cleaning agents combining multiple chemical reagents with different functions (dissolving, oxidizing, chelating) to effectively remove various types of impurities from silicon surfaces, achieving high purity through chemical synergy rather than mechanical energy
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
The device effectively removes impurities and bubbles from crystalline silicon fragments, ensuring thorough cleaning with reduced energy consumption and improved purity.
Implementation Method 1
utilizing pressure differences and rotating bristles to improve mixing and cleaning efficacy
Implementation Method 2
The organic solvents may form a hydrophobic area on the surface of the crystalline silicon fragments due to their strong hydrophobicity
Implementation Method 3
A cleaning device with multiple tanks, vacuum pumps, and rotating drums and impellers is used to separate bubbles and enhance contact between silicon fragments and cleaning agents
Implementation Method 4
rotating bristles to improve mixing and cleaning efficacy
Data Source
AI summary
A cleaning device for crystalline silicon recycled from photovoltaic cells by wet purification includes at least two tanks, a vacuum pump and first cleaning mechanisms arranged between the tanks. The number of the first cleaning mechanisms is the same as that of the tanks. An upper end of the tank is provided with a cover plate, and a lower end of the tank is provided with a discharge port. The upper end of the tank is provided with a ventilation port. The first cleaning mechanism includes a drum. A lower end of the drum is connected with a lower hood, and an upper end of the drum is connected with an upper hood. A sealing surface is arranged respectively between the drum and the lower hood and between the drum and the upper hood. The device includes the tanks, the vacuum pump and the first cleaning mechanisms.