The optoelectronic industry is facing a severe test of polysilicon raw material shortage, and global photovoltaic products continue to grow at an annual rate of 30%. Silicon metal 1501
| P | |||||
| Silicon Metal 1501 | 99.69 | 0.15 | 0.15 | 0.01 | Less than or equal to 0.004% |
1.The optoelectronic industry is facing a severe test of polysilicon raw material shortage, and global photovoltaic products continue to grow at an annual rate of 30%. Silicon metal 1501 mainly contains Fe, Al, Ca, Ti, B, P, O and other impurities, which can remove most of the metal impurities in silicon through directional solidification, but has no effect on the impurity elements with large coagulation coagulation coefficient. The method of slag refining is used to oxidize the impurity elements in silicon metal, and the oxidation and removal process of the impurity element boron in silicon. In the induction furnace, the slag of 40%CaO-60%SiO_2 is added to the silicon metal powder through SEM and EDS analysis, and the impurities distributed at the grain boundaries in the silicon metal are obviously removed by slag refining, but the heterophase of iron cannot be oxidized, the reactivity of the heterophase of calcium and CaO-SiO_2 slag is poor, and the slag is easy to adhere to the inner wall between the silicon and the crucible during the solidification process, and the slag and the silicon liquid can be well separated.
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