Selective grinding of glass to remove resin for silicon-based photovoltaic panel recycling
| Autor: | Yuki Tsunazawa, Chiharu Tokoro, Maiko Nishi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Glass recycling
Materials science Silicon General Chemical Engineering Glass fiber chemistry.chemical_element Rotational speed 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Grinding chemistry Mechanics of Materials Grind Particle size Composite material 0210 nano-technology Carbon |
| Zdroj: | Advanced Powder Technology. 32:841-849 |
| ISSN: | 0921-8831 |
| Popis: | Secondary grinding was investigated as a mean of liberating glass from locked particles of glass and resin obtained by the primary shredding from the silicon-based PV panels. Many previous studies on separating glass from resin have focused on chemical processes. However, a simple physical process—using an eccentric stirring mill to selectively grind the glass, separating the glass from the resin, and concentrating the glass into a narrower particle size group—resulted in successful liberation. Grinding rate analysis using the population balance model quantitatively confirmed that glass particles were more easily ground than resin particles and that locked particles were more easily ground than free particles. This is because the high specific gravity of the glass particles and the greater adhesiveness of the locked particles cause them to be located near the stirring blade of the mill. The selectivity of grinding became more significant and the grinding time shorter as the rotation speed increased. At the optimal grinding speed of 2500 rpm, 97% of the glass was concentrated into particles under 5.6 mm in size in 5 min. The resulting glass particles had a carbon content of 1% or less, which makes them suitable for the manufacture of glass fiber. |
| Databáze: | OpenAIRE |
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