A research on caustic fusion method of zircon concentrate has been conducted with applied single and double steps of leaching and filtration. The aims of research are to produce zirconia, ZrO 2 , with high purity, to study its crystal structure and cell parameters and also comparing the results of single, ZrO 2 (1), and double steps, ZrO 2 (2). The results show that ZrO 2 was successfully synthesized from high concentrate zircon, HG zircon. The ZrO 2 was crystallized in tetragonal structure and

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... space group of P42/NMC. The Fourier Plots of electron density of ZrO 2 (1) and ZrO 2 (2) at x, y and z axis show similar patterns. It indicates that the zirconia which was prepared by single and double steps leaching and filtration are the ZrO 2 with similar structure. Few dissimilar on the electron density patterns are founded in x and z axis. It probably caused by the higher sodium oxide and silicon dioxide contents in ZrO 2 (2). as it were confirmed by X-Ray Fluorescence analysis. The existence of impurities may affect the electron density near ions in a unit crystal. This research found that double step leaching and filtration method does not enhance the efficiency on zirconia recovery it even allows high content of sodium and silicone ions in ZrOCl 2 filtrate. The ZrO 2 concentration in single step powder is 72.07 % and its 70.99 % in double steps powder.