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| Study on Industrialization Technology of Silicon Material Purification in Recovery of Crystalline Silicon PV Module |
| Received:October 14, 2020 Revised:November 04, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.01.006 |
| KeyWord:silicon PV module; silicon PV battery; silicon material; purification; recovery |
| Author | Institution |
| MA Yun-feng |
青海黄河上游水电开发有限责任公司光伏产业技术分公司 青海省 西宁市 |
| HAN Jin-dou |
青海黄河上游水电开发有限责任公司光伏产业技术分公司 青海省 西宁市 |
| HE Yin-feng |
青海黄河上游水电开发有限责任公司光伏产业技术分公司 青海省 西宁市 |
| ZHENG Lu |
青海黄河上游水电开发有限责任公司光伏产业技术分公司 青海省 西宁市 |
| HOU Wen-wen |
青海黄河上游水电开发有限责任公司光伏产业技术分公司 青海省 西宁市 |
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| Abstract: |
| At present, purification and recovery of silicon materials in crystalline silicon photovoltaic (PV) modules are still at experimental stage, and raw materials used are only about 10 g, which has limited guidance for industrialization of silicon material purification in photovoltaic cells. In this experiment, industrial purification process of photovoltaic cell fragments with mass of about 3 kg was carried out by using a simple silicon purification equipment. The optimum purification process of chemical method include reaction time of battery particles of 15 min with 10% sodium hydroxide acid, 60 min with 30% nitric acid, and 15 min with 30% hydrofluoric acid. When particle size of purified silicon material is 1—4 mm, purification effect is the best, and recovery rate of silicon material is about 90%. Impurity content of purified silicon material can meet requirement of impurity content of industrial silicon powder, and purity is over 99.9%, which can be used in production of polysilicon. |
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