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7th Refractory & Abrasive Materials Summit 2019. May 23-24, 2019. Qingdao, Shandong, China CN103952753A - Production method of polycrystalline The invention discloses a production method of polycrystalline silicon for a solar battery. The method comprises the following steps:a) first, providing a metal silicon raw material and removing transitional groups and alkali metals from the raw material by a smelting purification method; b) then, continuously removing phosphorus, boron and germanium from the raw material by the smelting

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