研究目的
Synthesis of high-purity zircon, zirconia, and silica nanopowders from local zircon sand
研究成果
High-purity zircon, amorphous silica, cristobalite, amorphous zirconia, tetragonal zirconia, and monoclinic zirconia nanopowders were successfully synthesized from natural zircon sand by relatively low thermal treatments and at low cost. TEM observation showed that the corresponding crystallite size of the zircon, cristobalite, tetragonal zirconia, and monoclinic zirconia powders were 40, 149, 31, and 61 nm.
研究不足
The study focuses on the phase composition and the microstructure of the powders. The effectiveness of the mechanical milling and the alkali fusion process is validated, but the study does not explore the applications of the synthesized nanopowders in detail.
1：Experimental Design and Method Selection:
The study involved a low-cost purification approach via magnetic separation, immersion in HCl, and reaction with NaOH, followed by a top-down nanosizing process using wet ball-milling and annealing. A bottom-up method via alkali fusion and co-precipitation processes followed by calcination was used to derive polymorph zirconia and silica nanopowders.
2：Sample Selection and Data Sources:
The raw material was natural zircon sand from Central Kalimantan, Indonesia.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (CuKα=
4：54056 ?), FEI Inspect-S50 SEM, transmission electron microscope (FEI Tecnai-T20), wet ball-milling equipment. Experimental Procedures and Operational Workflow:
Purification of natural zircon sand, synthesis of ZrSiO4 nanopowder, synthesis of amorphous silica and cristobalite nanopowders, synthesis of amorphous, tetragonal, and monoclinic zirconia nanopowders.
5：Data Analysis Methods:
XRD patterns were analyzed for phase identification, phase compositions, and crystallite size estimation using Match!2, Rietica, and MAUD software.
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