Thermodynamic criteria of the end-of-life silicon wafers refining for closing the recycling loop of photovoltaic panels
| Autor: | Osamu Takeda, Xin Lu, Hongmin Zhu, Takahiro Miki, Tetsuya Nagasaka |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
high-temperature purification lcsh:Biotechnology 308 Materials resources / recycling 02 engineering and technology 010402 general chemistry 01 natural sciences Energy Materials end-of-life wafer Impurity Refining lcsh:TP248.13-248.65 lcsh:TA401-492 General Materials Science Wafer Closing (morphology) thermodynamic criteria silicon refining solvent refining Metallurgy Doping Photovoltaic system Solvent refining photovoltaic panels pyro-metallurgical recycling 50 Energy Materials 021001 nanoscience & nanotechnology 0104 chemical sciences Loop (topology) lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Science and Technology of Advanced Materials, Vol 20, Iss 1, Pp 813-825 (2019) Science and Technology of Advanced Materials |
| DOI: | 10.6084/m9.figshare.8850272 |
| Popis: | The collected end-of-life (EoL) silicon wafers from the discharged photovoltaic (PV) panels are easily contaminated by impurities such as doping elements and attached materials. In this study, the thermodynamic criteria for EoL silicon wafers refining using three most typical metallurgical refining processes: oxidation refining, evaporation refining, and solvent refining were systemically and quantitatively evaluated. A total of 42 elements (Ag, Al, Au, B, Be, Bi, C, Ca, Ce, Co, Cr, Cu, Fe, Ga, Gd, Ge, Hf, In, La, Mg, Mn, Mo, Na, Nb, Ni, Os, P, Pb, Pd, Pt, Re, Ru, Sb, Sn, Ta, Ti, U, V, W, Y, Zn, Zr) that are likely to be contained in the collected EoL silicon-based PV panels were considered. The principal findings are that the removal of aluminum, beryllium, boron, calcium, gadolinium, hafnium, uranium, yttrium, and zirconium into the slag, and removal of antimony, bismuth, carbon, lead, magnesium, phosphorus, silver, sodium, and zinc into vapor phase is possible. Further, solvent refining process using aluminum, copper, and zinc as the solvent metals, among the considered 14 potential ones, was found to be efficient for the EoL silicon wafers refining. Particularly, purification of the phosphorus doped n-type PV panels using solvent metal zinc and purification of the boron doped p-type PV panels using solvent metal aluminum are preferable. The efficiency of metallurgical processes for separating most of the impurity elements was demonstrated, and to promote the recycling efficiency, a comprehensive management and recycling system considering the metallurgical criteria of EoL silicon wafers refining is critical. Graphical Abstract |
| Databáze: | OpenAIRE |
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