Pelindian Logam Tanah Jarang dari Terak Timah dengan Asam Klorida setelah Proses Fusi Alkali

Kurnia Trinopiawan, Mohammad Zaki Mubarok, June Mellawati, Budi Yuli Ani

DOI: http://dx.doi.org/10.55981/eksplorium.2016.2719

Abstract


Terak timah yang merupakan limbah peleburan timah memiliki potensi untuk dapat dimanfaaatkan lebih lanjut dengan mengekstrak logam-logam berharga di dalamnya, seperti logam tanah jarang (LTJ). Tujuan penelitian ini adalah untuk menentukan kondisi optimal pelindian LTJ dari terak timah setelah proses fusi alkali. Struktur silika pada terak menyebabkan pelindian secara langsung menjadi tidak efektif. Oleh karena itu langkah pre-treatment dengan fusi alkali dibutuhkan untuk membuka struktur silika serta meningkatkan porositas terak. Fusi dilakukan selama 2 jam pada temperatur 700oC dengan perbandingan natrium hidroksida (NaOH) : terak = 2 : 1. Kemudian frit yang telah dilindi dengan air dilanjutkan dengan pelindian dengan asam klorida untuk melarutkan LTJ. Persen ekstraksi LTJ sebesar 87,5% diperoleh pada konsentrasi asam klorida (HCl) 2 M, temperatur 40oC, ukuran butiran -325 mesh, S/L = 15 g/100 ml, kecepatan pengadukan 150 rpm, dan waktu pelindian selama 5 menit.

 

Tin slag, a waste product from tin smelting process, has a potency to be utilized further by extracting the valuable metals inside, such as rare earth elements(REE). The objective of this study is to determine the optimum leaching condition of REE from tin slag after alkali fusion. Silica structure in slag is causing the direct leaching uneffective. Therefore, pre-treatment step using alkali fusion is required to break the structure of silica and to increase the porosity of slag. Fusion is conducted in 2 hours at 700 oC, with ratio of natrium hidroxide (NaOH) : slag = 2 : 1. Later, frit which is leached by water then leached by chloride acid to dissolve REE. As much as 87,5% of REE is dissolved at 2 M on chloride acid (HCl) concentration, in 40o C temperature, -325 mesh  particle size, 15g/100ml of S/L, 150 rpm of agitation speed, and 5 minutes of leaching time.


Keywords


terak timah, logam tanah jarang, fusi alkali, pelindian

References


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