Purification method of polysilicon
A purification method and polysilicon technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and cumbersome procedures, and achieve the effects of high removal rate, simple production process and low energy consumption
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Embodiment 1
[0014] Grind the polysilicon to 36-260μm, calcinate to 1045℃ at a speed of 5℃ / min under the protection of argon, stay for 0.5h, draw air while heating, continue to heat at a speed of 1℃ / min to 1250℃, stay for 0.5 h. During the calcination process, methanol was dropped into the calcination furnace at 650° C. until the calcination was completed. The rate of methanol drop was 50 drops / min per 100 g of polysilicon. The polysilicon is then removed from the calciner and rapidly quenched in cold water. 10 parts of hydrofluoric acid by moles, 9 parts of nitric acid, and 72 parts of deionized water are used to prepare a pickling solution, and the quenched polysilicon and pickling solution with a quality of 4% of the pickling solution quality are poured into a polytetrafluoroethylene device, heated To 60°C, the magnetic stirring speed is 1450r / min, pickling for 2h, and then add 4 parts of β-D fructofuranose in moles to the pickling solution, and continue pickling for 3h. Filter the pi...
Embodiment 2
[0016] Grind the polysilicon to 38-280μm, calcinate to 1048°C at a speed of 5°C / min under the protection of argon, pump air while heating, stay for 0.5h, continue to heat at a speed of 1°C / min to 1252°C, stay for 0.5 h. During the calcination process, drop methanol into the calcination furnace at 656°C until the calcination is completed. The rate of dropping methanol is 50 drops / min per 100g of polysilicon, then take out the polysilicon from the calcination furnace and place it in cold water Quenching. 10 parts of hydrofluoric acid by moles, 10 parts of nitric acid, and 71 parts of deionized water are used to prepare a pickling solution, and the quenched polysilicon and pickling solution with a mass of 5% of the pickling solution quality are poured into a polytetrafluoroethylene device, heated Temperature 68°C, magnetic stirring speed 1420r / min, pickling for 2.5 hours, then add 4.6 moles of sorbitol to the pickling solution, continue pickling for 3.5 hours, filter the picklin...
Embodiment 3
[0018] Grind polysilicon to 46-280μm, calcinate to 1052°C at a speed of 5°C / min under the protection of argon, pump air while heating, stay for 0.5h, continue to heat at a speed of 1°C / min to 1250°C, stay for 0.5 h. During the calcination process, drop methanol into the calcination furnace at 659°C until the calcination is completed. The rate of dropping methanol is 50 drops / min per 100g of polysilicon. Finally, take out the polysilicon from the calcination furnace, and quickly Quenching. 10 parts of hydrofluoric acid by moles, 9 parts of nitric acid, and 72 parts of deionized water are used to prepare a pickling solution, and the quenched polysilicon and pickling solution with a quality of 6% of the pickling solution quality are poured into a polytetrafluoroethylene device, heated The temperature is 66°C, the magnetic stirring speed is 1450r / min, pickling for 2 hours, then add 5 moles of mannitol to the pickling solution, continue pickling for 4 hours, filter the pickling po...
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