NOVELTY - Method for purifying silicon using mold involves forming a molten metal alloy in a crucible, cooling at least a portion of molten metal alloy to temperature less than the liquidus temperature and more than the eutectic temperature to precipitate silicon, controlling temperature within crucible to maintain minimum temperature more than the eutectic temperature within the crucible, preferentially cooling the crucible from bottom surface that includes a heat conducting material, and separating precipitated silicon from molten metal alloy.    USE - Method for purifying silicon using mold used for solar cell.    ADVANTAGE - The method economically and efficiently purifies silicon with high purity.    DETAILED DESCRIPTION - Method for purifying silicon using mold involves forming a molten metal alloy in a crucible, in which the alloy forms a binary eutectic system with silicon, cooling at least a portion of the molten metal alloy to a temperature less than the liquidus temperature and more than the eutectic temperature to precipitate silicon from molten metal alloy, controlling temperature within the crucible to maintain a minimum temperature more than the eutectic temperature within the crucible, preferentially cooling the crucible from a bottom surface that includes a heat conducting material having a more thermal conductivity than walls of the crucible, and separating the precipitated silicon from the molten metal alloy. An INDEPENDENT CLAIM is included for silicon purification system, which contains crucible including crucible lining layers, heating system located adjacent to the crucible to control temperature within at least a portion of the crucible, and heating system controller configured to maintain a minimum temperature within the crucible above a binary silicon alloy eutectic temperature, when in operation. The crucible lining layers includes metal shell with refractory lining and silicon carbide bottom layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of the mold for purifying silicon.    Crucible (200)    Sides (202)    Bottom (204)    Silicon flakes (206)    Liquid portion (208)