TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Composition: The non-conductive porous material constituting the porous walls is porous ceramic. Preferred Properties: The aluminum-silicon melt of top layer in the reversed three layers electrolytic structure on the electrode polarity has a specific gravity less than a specific gravity of the middle molten electrolyte layer. The copper-aluminum alloy melt of bottom layer in the reversed three layers electrolytic structure on the electrode polarity has a specific gravity more than a specific gravity of the middle molten electrolyte layer. The liquid purified aluminum of top layer in the three layers electrolytic structure has a specific gravity less than a specific gravity of the middle molten electrolyte layer. The copper-aluminum alloy melt of bottom layer in the three layers electrolytic structure has a specific gravity more than a specific gravity of the middle molten electrolyte layer. The electrolysis temperature is more than the eutectic point of the copper-aluminum alloy melt and the aluminum-silicon melt and less than the melting point of silicon.    TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Components: The Siamese Twins three-layer electrolytic cell has two areas horizontally separated by two suspended insult walls blocking the upper half of two areas and still connected in the lower half of the two areas. The lower half of the two areas is still a complete room to facilitate the current and aluminum atoms flowing through horizontally by the lower half of two areas from one area to the other. The Siamese Twins three-layer electrolytic cell has a magnetic stirrer set up to stir the bottom copper-aluminum alloy melt to form a copper-aluminum alloy melt flow circulation to transport aluminum atoms from the reversed three layers electrolytic structure area containing rich aluminum atoms to the three layers electrolytic structure area containing poor aluminum atoms to compensate aluminum concentration diffusion. The partition walls three-layer electrolytic cell has three respective regions horizontally isolated by two porous walls. under the aluminum- silicon melt anode region outside of the cell a magnetic stirrer is set up to stir the aluminum silicon melt to form a aluminum silicon melt flow circulation to transport aluminum atoms from the area containing rich aluminum atoms to the anodic reaction area containing poor aluminum atoms to compensate aluminum concentration diffusion.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred process: The aluminum-silica melt (M2) is employed as a source composition of the anode melt (I) in the first purification process. The purified aluminum from three layers electrolytic process in purifying steps is carried out in Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell. The silicon crystal from the aluminum-silicon melt constant temperature silicon crystallization process in purifying steps is accomplished in the anode region of Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell. After adjusting ingredients the aluminum-silica melt (I) with the majority of impurities is casted into aluminum-silica alloys. The purified aluminum (A1) and the silicon crystal (S1) from the first purification, is employed as source composition of the anode melt (II) in the second purification process. The aluminum-silicon melt (M3) from the third purification process, is employed as a source composition of the anode melt (II). The aluminum-silicon melt (M2) with the majority of impurities is re-fed into anode melt (I). The purified aluminum (A2) and the silicon crystal (S2) from the second purification process, is employed as source composition of the anode melt (III). The aluminum-silica melt (M3) with the majority of impurities is re-fed into anode melt (II). The anode melts are formed as the anode of the Siamese Twins three-layer electrolytic cell or partition walls electrolytic cell. The aluminum atoms electrolytically transfers from the topper aluminum-silicon melt layer through the middle molten electrolyte layer to the bottom liquid copper-aluminum alloy layer. Purification of silicon synchronously with three layers electrolytic process for purifying aluminum in an improved and innovative partition walls three-layer electrolytic cell involves providing an improved and innovative partition walls three-layer electrolytic cell which isolated into three respective regions by two porous walls, forming one side region in which there is the aluminum-silicon melt as anode, the other side region in which there is the liquid purified aluminum as cathode and the middle region is molten electrolyte between them where there are two porous walls, electrolytically transferring aluminum from one side anode region of aluminum-silicon melt through one porous wall, where the anodic reaction happened, into the middle molten electrolyte region in the form of aluminum ions, and meantime electrolytically transferring aluminum ions from the middle molten electrolyte region through another porous wall, where the cathodic reaction happened, into the other side cathode region of liquid purified aluminum in the form of aluminum atoms, providing a magnetic stirrer under aluminum-silicon melt anode region outside of the cell to circulate the aluminum-silicon melt to compensate aluminum and silicon concentration diffusion between the area nearing the porous wall, where anodic reaction is happening, there are poor aluminum atoms and rich silicon atoms, and the other area far away the porous wall where there are rich aluminum atoms and poor silicon atoms, continuously removing aluminum from the one side anode region of aluminum-silicon melt in the transverse conventional three layers electrolytic structure of partition walls three-layer electrolytic cell so as 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. In the partition walls three-layer electrolytic cell aluminum atoms are electrolytically transferred and transported from the aluminum-silicon melt anode region through the middle molten electrolyte region into the liquid purified aluminum cathode region by anodic reaction and cathodic reaction on two porous walls. Preferred Composition: The two suspended insult walls is made of insult material to prevent the current through horizontally the upper half of two areas. The three layers electrolytic structure comprises topper liquid purified aluminum layer as cathode, the middle molten electrolyte layer and the bottom liquid copper-aluminum alloy layer as anode. The only one bottom liquid copper- aluminum alloy layer in the Siamese Twins three-layer electrolytic cell not only serves as anode but also act as cathode in the reversed three layers electrolytic structure on the electrode polarity of the other area. The middle molten electrolyte layers of Siamese Twins three-layer electrolytic cell comprises one or more salts chosen from aluminum halogen, alkali halogen and alkaline earth halogen to provide a density of 2.72 gm/cm3 or more at the electrolysis temperature in the range of the eutectic point of the copper-aluminum alloy melt and the aluminum-silicon melt to the melting point of silicon. The aluminum-silicon melt of top layer in the reversed three layers electrolytic structure on the electrode polarity comprises 20-50 wt.% silicon with respect to content of aluminum, silicon and impurities. The silicon crystal seed rod is made of the silicon crystal that is purer than the crystallizing silicon crystal on the silicon crystal seed rod. The solid cathode it is made from the purified aluminum merged with the solid cathode. The partition walls of three- layer electrolytic cell has two porous walls made of conductive or non-conductive porous material capable of being permeable by the molten electrolyte and being impenetrable or impermeable to molten aluminum silicon alloying constituents and purified aluminum. The conductive porous material constituting the porous walls is porous carbon or graphite. The partition walls three respective regions are the aluminum-silicon melt anode region, the middle molten electrolyte region and the liquid purified aluminum cathode region. The alternate method of purifying silicon synchronously with three layers electrolytic process for purifying aluminum involves introducing the aluminum silicon melt from primary aluminum and metallurgical silicon as the anode of an electrolytic cell, obtaining molten purified aluminum as a cathode of the electrolytic cell, separating the anode of aluminum silicon melt and the cathode of molten purified aluminum by an electrolyte, transporting aluminum electrolytically from the anode to the cathode to form purified aluminum in the cathode, crystallizing silicon crystal at a constant electrolysis temperature in the anode with the transfer of aluminum when the aluminum silicon melt is saturated with silicon, mixing the purified aluminum and the purified silicon of silicon crystal to form aluminum silicon melt again to electrolysis in the cell to get pure aluminum and pure silicon, mixing the pure aluminum and the pure silicon to form aluminum silicon melt to electrolysis to get pure aluminum and pure silicon.