NOVELTY - The crucible structure (10) has a water-cooling coil (11) that is set as a square-shaped horizontal winding or round-shaped horizontal winding. The horizontal winding is arranged in a horizontal direction along the axial direction (D) of the coil, or is inclined on the top portion (11a) of the coil. The lower portion (11b) of the coil is arranged in step shape so that one or more bottom portions (E) of valley (V) are provided with respect to the horizontal direction of the coil. The inclination portion is set to a valley bottom portion.    USE - High-frequency induction coil integrated crucible structure for removing boron and phosphorus from metallic silicon used as raw material of solar cell.    ADVANTAGE - The continuous process of removing boron and phosphorus from metallic silicon is enhanced efficiently using a compact crucible structure, at low cost.    DETAILED DESCRIPTION - The crucible structure has the coil whose lower portion of an exit side is low with respect to the lower portion of the coil of the entrance side of the crucible portion. An INDEPENDENT CLAIM is included for a method for removing boron and phosphorus from metallic silicon, involves using the high-frequency induction coil integrated crucible structure. An oxidizing agent is added to the silicon material, and is prepared in a molten metal state. The portion through which the lower portion column of the coil is moved to the valley bottom portion, is inclined. The magnetic field (B) is formed at the lower portion column of the coil. An induced current is formed in the circumferential direction of the time change of the magnetic field. A silicon molten metal (S) is formed to receive the force (F) in the direction orthogonal to the magnetic field, according to this induced current. The stirring action is produced. The boron in the silicon molten metal is oxidized, phosphorus vaporized and removed.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the high-frequency induction coil integrated crucible structure.    High-frequency induction coil integrated crucible structure (10)    Water-cooling coil (11)    Top portion of coil (11a)    Lower portion of coil (11b)    Magnetic field (B)    Axial direction (D)    Valley bottom portions (E)    Force (F)    Silicon molten metal (S)    Valley (V)