NOVELTY - A supply apparatus (11) is arranged to supply silicon raw material to heat resistant containers (17a-17c). Several process chambers (15a-15c) are provided with heating apparatus (19a-19c) to heat the heat resistant containers. The internal pressure of process chamber is reduced by reduction containers (20a,20b). A dephosphorylating processing apparatus is installed in process chambers to selectively remove phosphorus from melted silicon in pressure reduction state. A demetallation processing apparatus is arranged to remove metal from silicon by segregation process.    USE - Purifier for purifying silicon used in solar cells.    ADVANTAGE - Since the phosphorus and metal are removed from the melted silicon by the dephosphorylating processing apparatus and demetallation processing apparatus, the purification efficiency of the silicon can be improved reliably. The cost of the silicon purifier can be reduced effectively by simplified structure.    DETAILED DESCRIPTION - The process chamber is rotated with respect to the vertical axes of the dephosphorylating processing apparatus and demetallation processing apparatus by a rotary structure (16). A cooling substrate is rotated by the rotary structure, to allow the cooling medium to pass through the process chamber. The number of the dephosphorylating processing apparatus and the demetallation processing apparatus installed in the process chambers are decided according to the impurity density of the silicon raw material. An INDEPENDENT CLAIM is included for purification method of silicon, involves detecting the presence or absence of the inert gas which is introduced into the heat resistant container. The impurity density of the silicon raw material is measured, and the number of the dephosphorylating processing apparatus and demetallation apparatus to-be-used for removing process are decided according to the impurity density.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the silicon purifier.    Silicon raw material supply apparatus (11)    Process chambers (15a-15c)    Rotary structure (16)    Heat resistant containers (17a-17c)    Heating apparatus (19a-19c)    Pressure reduction containers (20a,20b)