NOVELTY - The silicon manufacturing apparatus (S1) has a reactor (2) that is communicated in downstream of reactor (1). A zinc gas supply system (5) supplies the zinc gas in the reactors. The rector (1) restores the silicon compound with zinc and generates the solid silicon. The reactor (2) restores the silicon compound with zinc and generates solid silicon using solid silicon of relatively small crystal size as a seed crystal generated by reactor (1). A heating unit heats the solid silicon inside the reactors to reach melting point.    USE - Apparatus for manufacturing silicon used for solar cells.    ADVANTAGE - The silicon precipitation in the wall surface of reaction device can be avoided. The solid silicon of constituent quality and fixed shape can be manufactured continuously.    DETAILED DESCRIPTION - The control systems maintain the silicon compound gas and zinc gas in the relation of predetermined molar ratio. The flow element (13) detects the flow volume of silicon compound gas flowing through the supply line. The flow controller (14) controls the flow volume of silicon compound gas flowing through the supply line through the valve based on detected result of flow element. A feeder controller (22b) controls the rotation of rotation element for providing fixed quantity of liquid. The processing apparatus liquefies or solidifies the generated zinc compound gas with the reactor. The control system controls the flow rate of gas passing reactors while controlling the acceptance gas volume of zinc compound gas. The air condenser (71) with cooling medium supply system supplies the cooling medium and controls the cooling capacity of air condenser. The cooler (C) maintains the air flowing through air line to constant temperature. The ventilation fan (82) ventilates the air condenser through the air line in the air maintained at constant temperature. The zinc compound tank receives the melting zinc compound liquefied by air condenser. The load cell (91) measures the weight of zinc compound accumulated in zinc compound tank. The ejector produces negative pressure for supplying ejection medium. The ejection medium supply system controls the cooling capacity of ejector. The flow element detects the flow volume of ejection medium flowing through supply line. The flow controller controls the flow volume of ejection medium flowing through the supply line based on detected result of flow element. The flow controller controls the opening degree of bulb so that the variation in weight of zinc compound is fixed. The heater maintains uniformly the temperature inside the reactors. The gas treatment equipment (3) is communicated in downstream of reactor. The silicon compound gas is supplied to upstream with respect to reactor rather than zinc gas supplied from zinc gas supply system.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the silicon manufacturing apparatus.    Reactors (1,2)    Gas treatment equipment (3)    Zinc gas supply system (5)    Flow element (13)    Flow controller (14)    Feeder controller (22b)    Air condenser (71)    Ventilation fan (82)    Load cell (91)    Cooler (C)    Silicon manufacturing apparatus (S1)