STUDI PERBANDINGAN PENCUCIAN PASIR KUARSA DARI TUBAN SEBAGAI BAHAN BAKU MATERIAL SILIKA
Abstract
Pasir Kuarsa dari Tuban sudah terkenal sejak zaman Belanda sebagai Kawasan sumber pasir kuarsa di Indonesia. Hingga saat ini sebagian besar pasir kuarsa dari Kabupaten Tuban hanya dimanfaatkan sebagai bahan baku bangunan secara langsung dan secara tidak langsung yaitu untuk bahan baku semen. Pada tulisan ini akan dikaji proses pencucian pasir kuarsa Tuban untuk bahan baku material berbasis silika. Hasil dari proses pencucian menunjukkan bahwa pencucian dengan asam lebih baik daripada pencucian air dan pelarutan NaOH dilanjutkan presipitasi. Proses pencucian dengan asam oksalat memberikan hasil paling baik dibandingkan dengan pelarutan HCl. Pengotor besi dan kalsium dapat dipisahkan dengan proses pencucian sedangkan pengotor kalium dan aluminium sulit dipisahkan. Hasil yang diperoleh dari proses pencucian adalah pasir kuarsa lebih murni dengan kadar silika sampai 97,77 % dan potensi mendapatkan besi oksida dan besi oksalat. Bahan tersebut dapat digunakan untuk bahan baku Litium Ferro Phospate pada baterai litium.
Kata kunci: Kuarsa, pencucian, air , asam khlorida, asam oksalat
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