NOVELTY - An anode melt (I) is formed. The anode melt (I) is added as the anode. The anode melt (I) is electrolyzed. The aluminum-silicon melt is drained into a casting furnace, and aluminum-silicon melt (M1) is casted into aluminum-silicon alloy after adjusting ingredients. An anode melt (M2) is formed and the anode melt (II) is added as the anode. The anode melt (M2) is electrolyzed. An anode melt (M3) is formed, and added as the anode. The anode melt (M3) is electrolyzed to produce a purified aluminum (A3), a silicon crystal (S3) and the aluminum-silicon melt (M3).    USE - Purification of aluminum and silicon used as raw material for solar photovoltaic cells (claimed) for power generation.    ADVANTAGE - The method enables efficient and economical purification of alumina and silica having excellent purity with high yield.    DETAILED DESCRIPTION - An anode melt (I) is formed from metallurgical silicon (99.5%), primary aluminum (99.85%), the aluminum-silicon melt (M2). The anode melt (I) is added into the Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell as the anode. The anode melt (I) is electrolyzed simultaneously to produce purified aluminum (A1), a silicon crystal (S1) and the aluminum-silicon melt (M2) in different zones of the Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell. The aluminum-silicon melt is drained into a casting furnace, and aluminum-silicon melt (M1) is casted into aluminum-silicon alloy after adjusting ingredients. An anode melt (M2) is formed from the purified aluminum (A1), the silicon crystal (S1) and aluminum-silicon melt (M3), and the anode melt (II) is added into the Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell as the anode. The anode melt (M2) is electrolyzed in the Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell, to simultaneously produce a purified aluminum (A2), a silicon crystal (S2) and aluminum-silicon melt (M2). An anode melt (M3) is formed from the purified aluminum (A2) and silicon crystal (S2), and then the anode melt (M3) is added into another Siamese Twins three- layer electrolytic cell or partition walls electrolytic cell as the anode. The anode melt (M3) is electrolyzed in the another Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell, to simultaneously produce a purified aluminum (A3), a silicon crystal (S3) and the aluminum-silicon melt (M3). An INDEPENDENT CLAIM is included for purification process of silicon synchronously with three layers electrolytic process for purifying aluminum in an improved and innovative Siamese Twins three-layer electrolytic cell, which involves providing an improved and innovative Siamese Twins three-layer electrolytic cell which separated into two areas by two portions suspended insult walls, forming one area as three layers electrolytic structure in which the topper layer is the liquid purified aluminum as cathode, the middle layer is molten electrolyte and the bottom layer is the liquid copper-aluminum alloy as anode, forming the other area as a reversed three layers electrolytic structure on the electrode polarity in which the topper layer is the aluminum-silicon melt as anode, the middle layer is still molten electrolyte and the bottom layer is the liquid copper-aluminum alloy as cathode, connecting two areas by the one bottom liquid copper-aluminum alloy layer, electrolytically transferring aluminum from the top layer of aluminum-silicon melt anode through the middle molten electrolyte layer to the bottom layer of copper-aluminum alloy melt cathode in the reversed conventional three layers electrolytic structure on the electrode polarity, providing a magnetic stirrer under the cell to circulate the bottom copper-aluminum alloy melt to compensate aluminum concentration diffusion from the reversed three layers electrolytic structure area to the three layers electrolytic structure area, electrolytically transferring aluminum from the bottom layer of copper-aluminum alloy melt anode through the middle molten electrolyte layer to the top layer of liquid purified aluminum cathode in the three layers electrolytic structure, continuously removing aluminum from the top layer of aluminum-silicon melt in the reversed three layers electrolytic structure on the electrode polarity of Siamese Twins three-layer electrolytic cell so that the aluminum- silicon melt is saturated with silicon and silicon crystal is growing on the silicon crystal seed rod to crystallize silicon at a constant electrolysis temperature and so silicon is purified in the aluminum-silicon melt constant temperature silicon crystallization process.