Pertala, Muhammad Afriza (2025) PENGARUH AGEN FUSI, TEMPERATUR, DAN RASIO MASSA PROSES FUSI ALKALI TERHADAP EKSTRAKSI ZIRKON DARI PASIR ZIRKON LOKAL. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.

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Abstract

ABSTRACT Indonesia possesses abundant zircon sand reserves however, their utilization remains largely limited, with most of the material still being exported without downstream processing. In fact, zircon sand has great potential to be processed into high-value products, one of which is zirconium oxychloride octahydrate (ZOC), which can be further converted into refractory materials, fuel cells, oxygen sensors, and zirconia-based nanomaterials. This study aims to extract zirconium (Zr) from local zircon sand through an alkali fusion pretreatment followed by water leaching and acid leaching, as well as to determine the optimal process parameters. The alkali fusion process was carried out using three different fusion agents NaOH, KOH, and a NaOH–KOH mixture at temperatures of 600, 750, and 900 °C with alkali-to-zircon sand mass ratios of 1,4:1, 1,6:1, and 1,8:1. The best fusion result for each agent was subjected to water leaching at 50°C to dissolve Si, followed by acid leaching using 6 M HCl at 80°C. The results show that the process effectiveness was influenced by both the type of fusion agent and the applied process parameters. The NaOH fusion agent produced the highest zirconium extraction yield, reaching 68,11% at a mass ratio of 1,8:1. Meanwhile, KOH showed optimal performance at 600°C with a 1,4:1 ratio, and the NaOH–KOH mixture was optimal at 750°C with a 1,8:1 ratio. Therefore, alkali fusion using NaOH proved to be more effective than the other two fusion agents. Keywords: Local Zircon Sand, Alkali Fusion, Water Leaching, Acid Leaching, Zirconium Extraction

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