Quality Increasing of Zirconia from Treatment of Zircon Sand

This research is intended to study of quality increasing of zirconia from treatment of zircon sand, by increasing of stage in water leaching, one stage in treatment process of zircon sand. The process is undertaken with the approach of alkaline fusion - water - leaching, - hydrochloric acid leaching - precipitation - calcination. From this research, it was obtained that increasing in stage of water leaching was caused the concentration of zirconia increase, but when increasing in concentration of ammonium hydroxide, the concentration of zirconia was decreased. The optimum condition is the third stage in leaching and the optimum concentration of ammonium hydroxide was 12.5%. In this condition, the final result obtained was zirconia with the purity around 99.01%. (author)