NOVELTY - A silicon refiner has smelting furnace (10) comprising molten raw material silicon, purified gas blowing-in stirrer (S1) for stirring molten silicon (M) and purifying silicon by blowing purified gas (G), and rotary shaft (5) having purified-gas introducing pipe (4) and gas blowing hole (7) connected with stirring material (6). The gas blowing hole is opened by stirring material having angular portion in outer surface.    USE - For manufacturing silicon used in solar cell and semiconductor electronic component.    ADVANTAGE - The silicon refiner prevents clogging of blowing hole, by stripping off lump of silicon dioxide formed at the opening end surface of the blowing hole, at the time of purifying silicon. The refiner enables producing high purity silicon economically in less time, and efficiently removing impurities such as boron.    DETAILED DESCRIPTION - A silicon refiner has a smelting furnace (10) comprising molten raw material silicon containing impurity, a purified gas blowing-in stirrer (S1) for stirring molten silicon (M) and purifying silicon by blowing purified gas (G) containing oxidizing gas, in the furnace, a rotary shaft (5) having a purified-gas introducing pipe (4) and a gas blowing hole (7) connected with a stirring material (6), is formed at the outer surface of the pipe (4). The stirring material has an angular portion in the outer surface, and the gas blowing hole is opened by the angular portion of the stirring material. The stirring material in the molten silicon is moved by actuating the rotary shaft with a rotary shaft-driving unit.    INDEPENDENT CLAIMS are also included for the following:    (1) purifying molten silicon, which involves purifying raw material silicon containing impurity such as molten slag containing alkali-metal oxide, alkaline-earth metal oxide, aluminum oxide or calcium fluoride, using the refiner; and    (2) silicon purified by the purifying method using the refiner.    DESCRIPTION OF DRAWING(S) - The figure shows the front sectional drawing of the silicon refiner.    purified gas introducing pipe (4)    rotary shaft (5)    stirring material (6)    gas blowing hole (7)    purified gas (G)    molten silicon (M)    purified gas blowing-in stirrer (S4)