Kesetimbangan Cair-cair untuk Perhitungan Jumlah Tingkat Mixer Settler pada Pemisahan Konsentrat Neodimium dari Itrium
Abstract
Neodymium (Nd) as raw material for permanent magnet begins to globally develop in various fields. The magnetic quality is far better than other materials such as iron, Al-Ni-Co, Sm-Co, and Sm-Fe-N alloy. However, Nd must be separated from other elements especially yttrium (Y). The presence of Y can reduce the quality of permanent magnet produced since Y has magnetic properties opposite to Nd. One of the separating methods that can be applied is liquid – liquid extraction. Extraction was carried out by using 10% of di-ethyl-hexyl-phosphate (D2EHPA) as the solvent. Information on the phase equilibrium is of importance in the design of large scale extraction system. With a stirring speed of 200 rpm the phase equilibrium conditions were reached after 25 minutes. This study aimed to generate phase equilibrium data and to develop mathematical model to quantitatively describe the phase equilibrium, then to predict the number of extraction stages for the separation. The calculation was done by using stage to stage calculation method based on the mass balance and liquid-liquid equilibrium model proposed. The result shown the number of stages to separate Y from Nd concentrated by using mixer settler is 6 stages with the total recovery of Y is 93%.
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