Wijaya, Panca Putu (2025) Ekstraksi Silika dari Terak Feronikel melalui Double Stage Hydrothermal, Water Leaching, dan Precipitation Sebagai Bahan Baku Bioglass. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
The increasing global demand for nickel has driven the growth of the ferronickel industry and its production capacity. For every ton of ferronickel produced, up to 14 tons of ferronickel slag are generated. In 2022, Indonesia was estimated to have produced over 79 million tons of slag, with less than 10% being utilized. Most of this slag is openly discarded, posing potential environmental and health risks due to hazardous elements such as chromium. Ferronickel slag contains a high amount of silica, approximately 44%–52%, making it a promising alternative raw material, particularly for bioglass synthesis. Therefore, the utilization of silica from ferronickel slag represents a strategic effort for sustainable industrial waste management and the optimization of valuable mineral resources. This study was conducted using a two-stage hydrothermal process. Stage I was carried out at 250 °C with a NaOH/residue I mass ratio of 1.3:1 for 5 hours, followed by water leaching to obtain filtrate and residue. The residue (residue I) was then processed in Stage II under varying conditions of temperature (150, 200, 250 °C), reaction time (1, 2, 3, 4, and 5 hours), and NaOH/residue I mass ratio (0.1:1; 0.25:1; 0.5:1; 0.75:1; 1:1; 1.5:1; and 2:1). The optimum condition was achieved at 250 °C for 5 hours with a NaOH/residue I mass ratio of 1.3:1, resulting in a cumulative silica extraction of 91.76%. The filtrate containing sodium silicate was subsequently precipitated using 2 M HCl at different pH levels (2, 4, and 7). The best precipitation occurred at pH 2, yielding a SiO₂ content of 94.70%. However, the obtained silica purity has not yet met the minimum standard required for bioglass production, which is 99.17%.
| Item Type: | Thesis (S1) | |||||||||
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| Subjects: | T Technology > TN Mining engineering. Metallurgy | |||||||||
| Divisions: | 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi | |||||||||
| Depositing User: | Panca Putu Wijaya | |||||||||
| Date Deposited: | 15 Sep 2025 05:22 | |||||||||
| Last Modified: | 15 Sep 2025 05:22 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/54616 |
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