Peningkatan Kualitas Pasir Zirkon (Zrsio4) Menggunakan Metode Carbothermal dan Pelindian dengan Desain Taguchi
Zirconia (ZrO2) is one of the most useful oxides in a variety of advanced ceramic industries.
Zircon sand can be purified into zirconia by various methods such as thermal dissociation,
decomposition by fusion, Chlorination, Mechanical Processing, Hydrothermal Decomposition, and
others. Nevertheless each method has advantages and disadvantages so it is necessary to research the
use of other alternative methods in the purification. In this research, the quality of zircon sand (ZrSiO4) into zirconia is done by carbothermal method. Anthracite is used as a carbon source which is added to zircon sand with an appropriate stockomethometry ratio. A mixture of zircon and anthracite sand is heated in the furnace heating room until it reaches the temperature of 1000oC. The process of leaching the sample using the L27(313) orthogonal matrix experimental design. The leaching process variation consists of 4 factors and 3 levels. The leaching results were tested using X-Ray Difraction (XRD) and XRay Fluorescence to determine the amount of zirconia formed. The test results were analyzed
statistically using ANOVA and showed that carbothermal process followed by acid leaching process can increase zirconia levels. Optimum conditions of leaching process were the concentration of 6M solution, 2 hours stirring time, 50 oC temperature, and 1500 rpm rotation with error of 0.25% between confirmatory experiments with Taguchi predictions.