Upaya Peningkatan Kadar SiO2 Pasir Kuarsa Tailing Timah melalui Acid Leaching
DOI:
https://doi.org/10.29313/bcsme.v6i2.24418Keywords:
Kadar SiO2, XRF, SEM-EDSAbstract
Abstract. Quartz sand derived from tin tailings has potential as a raw material for porcelain ceramics; however, its initial SiO₂ content of 87.50% does not meet the requirements of SNI 1026:1989. This study aimed to evaluate the improvement of SiO₂ content and the reduction of impurity oxides using oxalic acid leaching. Sample preparation included washing, drying, sieving, magnetic separation, and grinding. The leaching process was carried out at 80°C for 120 minutes with a stirring speed of 350 rpm using oxalic acid concentrations of 1.5 g/L and 3 g/L. Chemical composition was analyzed by X-Ray Fluorescence (XRF), while surface morphology was characterized using Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS). The SiO₂ content increased from 87.50% to 95.87% after washing. Acid leaching produced SiO₂ contents of 95.67% and 95.51% at oxalic acid concentrations of 1.5 g/L and 3 g/L, respectively, accompanied by reductions in Al₂O₃, CaO, Fe₂O₃, and TiO₂. The results indicate that oxalic acid leaching effectively improves quartz sand purity by reducing impurity oxides; however, the highest SiO₂ content obtained (95.67%) still falls below the 97.10% requirement specified in SNI 1026:1989 for porcelain raw materials.
Keywords: Quartz Sand, Acid Leaching, Oxalic Acid, Purification, SiO₂.
Abstrak. Pasir kuarsa dari tailing timah berpotensi dimanfaatkan sebagai bahan baku keramik halus jenis porselen, namun kadar SiO₂ awal sebesar 87,50% belum memenuhi persyaratan SNI 1026:1989. Penelitian ini bertujuan mengevaluasi peningkatan kadar SiO₂ dan penurunan kadar pengotor melalui metode acid leaching menggunakan asam oksalat. Preparasi sampel meliputi pencucian, pengeringan, pengayakan, pemisahan magnetik, dan penggerusan. Proses acid leaching dilakukan pada suhu 80°C selama 120 menit dengan kecepatan pengadukan 350 rpm menggunakan konsentrasi asam oksalat 1,5 g/L dan 3 g/L. Karakterisasi dilakukan menggunakan X-Ray Fluorescence (XRF) untuk menentukan komposisi kimia dan Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) untuk mengamati morfologi permukaan. Hasil penelitian menunjukkan kadar SiO₂ meningkat dari 87,50% menjadi 95,87% setelah pencucian. Perlakuan acid leaching menghasilkan kadar SiO₂ sebesar 95,67% pada konsentrasi 1,5 g/L dan 95,51% pada 3 g/L, disertai penurunan kadar Al₂O₃, CaO, Fe₂O₃, dan TiO₂. Metode acid leaching efektif meningkatkan kemurnian pasir kuarsa melalui pengurangan unsur pengotor, namun kadar SiO₂ yang diperoleh masih belum memenuhi persyaratan SNI 1026:1989 sebesar 97,10% untuk bahan baku porselen.
Kata Kunci: Pasir Kuarsa, Acid Leaching, Asam Oksalat, Pemurnian, SiO₂
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