Perhitungan Stage Mixer Settler untuk Pemurnian Torium (Th) dari Pelarutan Monasit

Hafni Lissa Nuri, Prayitno Prayitno, Abdul Jami

DOI: http://dx.doi.org/10.55981/eksplorium.2018.4524

Abstract


ABSTRAK

Monasit (Ce, La, Nd, Th,)PO4 dengan kandungan torium (Th) antara 3-4% cukup signifikan untuk diproses menghasilkan Th. Pengolahan awal dilakukan dengan pelindian monasit menggunakan reagen basa karbonat (Na2CO3) untuk mengambil uraniumnya. Sisa tailing dilarutkan dengan asam sulfat untuk menghasilkan larutan Th(SO4)2 yang kemudian dimurnikan dari unsur-unsur pengotornya. Pengolahan dilakukan secara kontinyu menggunakan mixer settler dengan tahapan proses meliputi proses ekstraksi Th, stripping Th dan regenerasi pelarut organik. Ekstraksi Th menggunakan pelarut organik Primene JM-T (RNH2) yang merupakan campuran dari 0,15M Primene JM; 5% Tridecanol; dan 95% Kerosin. Sementara itu, proses stripping Th menggunakan larutan 2M HCl. Untuk efisiensi maka regenerasi pelarut organik menggunakan 1% H2SO4. Untuk mendapatkan recovery dan kemurnian yang tinggi dari Th, penghitungan jumlah stage mixer settler diperlukan dengan menggunakan metode McCabe Thiele. Dari hasil perhitungan diperoleh jumlah stage dalam proses ekstraksi Th adalah 3, proses stripping Th adalah 3 dan regenerasi pelarut organik adalah 2. Recovery total Th sebesar 84,90% diperoleh dengan kemurnian produk mencapai 99,02%.

 

ABSTRACT

Monazite (Ce, La, Nd, Th)PO4 with thorium (Th) content between 3-4 % is significant enough to be processed to produce Th. The initial treatments conducted by using carbonate base reagents (Na2CO3) for monazite leaching to fetch the uranium. The remaining tailings were dissolved with sulfuric acid to produce Th(SO4)2 solution which is then purified from its impurities. The processing is carried out continuously using a mixer settler with the process steps include Th extraction, Th stripping, and organic solvents regeneration. Thorium extraction uses a primene JM-T (RNH2) organic solvent which is a mixture of 0.15M Primene JM; 5% Tridecanol and 95% Kerosine. Meanwhile, the Th stripping process uses 2M HCl solution. For efficiency, regeneration of organic solvents uses 1% H2SO4. To obtain a high recovery and purity from Th, it is necessary to calculate the number of stage mixer settlers using the McCabe Thiele method. Based on the calculation, the number of stage for extraction process, Th stripping, and organic solvents regeneration are 3, 3, and 2 respectively. The total recovery of Th is obtained at 84.90 % where product purity reaches 99.02 %.


Keywords


stage; mixer settler; pemurnian; monasit; torium

References


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