A fluidized-bed reactor (1A) includes a reaction vessel (10A) configured to contain metallurgical grade silicon powder and a hydrogen chloride gas, and a portion of a side wall (w) which portion extends along at least 80% of a height extending from a gas feed opening (21), which is provided in a lower part of the reaction vessel (10A), to a top face of a fluid bed (40) has such a tapered shape that a cross section of the reaction vessel (10A) which cross section is taken perpendicular to a height direction of the reaction vessel (10A) increases in area in an upward direction.

A production method is a method for producing trichlorosilane, the method including opening and closing, with use of a non-sliding valve (b1 to b4), an entry channel (f1), an exit channel (f2), a discharge channel (f31), and a discharge channel (f32) through each of which metallurgical grade silicon powder flows in a system for producing the trichlorosilane, the non-sliding valve including a valve body capable of being rotated without coming into contact with a valve seat.

A fluidized-bed reactor (1A) includes a reaction vessel (10A) configured to contain metallurgical grade silicon powder and a hydrogen chloride gas, and a portion of a side wall (w) which portion extends along at least 80% of a height extending from a gas feed opening (21), which is provided in a lower part of the reaction vessel (10A), to a top face of a fluid bed (40) has such a tapered shape that a cross section of the reaction vessel (10A) which cross section is taken perpendicular to a height direction of the reaction vessel (10A) increases in area in an upward direction.

The present invention relates to an apparatus for producing trichlorosilane from tetrachlorosilane in an efficient manner. The apparatus includes an inlet through which reaction raw materials including a metal silicon powder dispersed in liquid tetrachlorosilane enter, a hole through which a gaseous reaction raw material is fed, an outlet through which reaction products including trichlorosilane exit, a tubular reactor in which the reaction raw materials entering through the inlet react with each other during flow, and means for impeding the flow of the fluids to cause collision of the fluids during flow.

The present invention relates to an apparatus for producing trichlorosilane from tetrachlorosilane in an efficient manner. The apparatus includes an inlet through which reaction raw materials including a metal silicon powder dispersed in liquid tetrachlorosilane enter, a hole through which a gaseous reaction raw material is fed, an outlet through which reaction products including trichlorosilane exit, a tubular reactor in which the reaction raw materials entering through the inlet react with each other during flow, and means for impeding the flow of the fluids to cause collision of the fluids during flow.

The present invention is for the recovery of maximum silicon value of kerf silicon waste, produced during the manufacture of silicon wafers by wire saw, diamond saw and chemical mechanical polishing, as high purity metallurgical silicon. This recovery is achieved by a process scheme that effects an initial removal of minor extrinsic metallic impurities but not the major silicon compound impurities, and followed, preferentially, by a direct metallurgical process to form elemental silicon. The recovered silicon is for use as feedstock for polysilicon manufacturing, as high purity polysilicon for PV application, and in metallurgical alloy manufacture.