| 초록 |
Since solar modules have a life span of about 20 years, a large amount of waste modules will be discharged in the future and how to handle them is a problem. Most of the metal in the solar module is dependent on imports. Especially, if imported metals and silicon recovery technologies are developed from solar cells, which are in increasing demand, import substitution is expected, which is essential technology for strengthening competitiveness in renewable energy sector. In this study, supercritical CO2 was used for the recovery of valuable metals and silicon. Supercritical fluid is defined when the temperature and pressure above the critical point are applied, the characteristics of gas and liquid are mixed. Its density or solubility of a supercritical fluid is close to that of a liquid, and its viscosity, diffusivity and thermal conductivity are similar to those of a gas. CO2 has various advantages as a supercritical fluid solvent such as low critical point, high density, eco-friendly, harmless, and non-inflammable. In this work, an experiment was conducted to remove silver, aluminum, and copper thin films deposited on a silicon substrate with a change in the temperature, pressure, and flow rate using supercritical CO2. Finally we compared the efficiency of the removal, and studied the influence of temperature, pressure, and flow rate on metal removal. |
