JPS6465010A - Device for producing high-purity granular metallic silicon - Google Patents

Abstract

PURPOSE:To continuously produce the title high-purity granular metallic silicon with low power consumption by providing a flow straightening device in a reaction vessel to form a fluidized bed, furnishing a heater on the outside of the vessel, and making the vessel and the device from a metallic silicon plate. CONSTITUTION:The flow straightening device 3 made from a high-purity metallic silicon plate is provided in the vicinity of the bottom of the reaction vessel 1 made from a high-purity metallic silicon plate, and the fluidized bed 2 of the high-purity metallic silicon grains packed in the vessel 1 is formed. The heaters 9a and 9b are provided at the upper and lower parts on the outside of the vessel 1 to adjust the internal temp. of the vessel 1 to a temp. appropriate for the reaction. The raw gas and hydrogen are blown into the fluidized bed 2 heated by the heaters 9a and 9b from the lower part, and the silicon in the raw gas is reduced and deposited on the surface of the high-purity metal grains. The grains with the increased diameter are moved to the lower part, and classified by the gas sent from a classifying gaseous hydrogen supply pipe 5. The small-diameter grains are returned to the fluidized bed 2. Only the grains having a sufficiently large diameter are discharged from a discharge pipe.