CRUSHING AND SIEVING OF SILICON PARTICLE

• Main Authors: HOSAKA TADASHI, ENOMOTO YOSHIHIRO, KANEKO KIYOSHI
• Format: Patent
• Language: English
• Published: 30.08.1983
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; INORGANIC CHEMISTRY; METALLURGY; MILLING GRAIN; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PREPARATORY TREATMENT OF GRAIN FOR MILLING; TRANSPORTING

PURPOSE:To recover the highly pure fine Si powder without contamination, by pulverizing highly pure coarse Si particles with a roll crusher having rolls made of highly pure Si, and elutriating the resultant mixture of powdery and granular Si with air in an air elutriation tube made of quartz, etc. CONSTITUTION:Coarse Si particles having diameter of 0.5-10mm. and charged to the hopper 11, or coarse Si particles left after the air elutriation in the following process, are pulverized by a double-roll crusher 12 having highly pure Si rods as the rolls. The resultant mixture of the powdery and granular Si is stored in the feed box 13, and sent together with the introduced N2 gas 14 to the air elutriation tube 15 made of quartz. The fine Si particles having an average diameter of <=0.5mm. are entrained together with fine Si powder by N2 stream and discharged from the air elutriation tube 15. The fine particles are collected by the cyclone 19, and the fine powder is recovered by the bag filter 20. The coarse particles having diameter of about >=0.8mm. are stoed in a coarse particle tank 21 and recycled to the crusher 12.