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Wanta, Kevin Cleary
Departemen Teknik Kimia Fakultas Teknik Universitas gadjah Mada

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Uji Validitas Model Shrinking Core terhadap Pengaruh Konsentrasi Asam Sitrat dalam Proses Leaching Nikel Laterit Wanta, Kevin Cleary; Petrus, Himawan TBM; Perdana, Indra; Astuti, Widi
Jurnal Rekayasa Proses Vol 11, No 1 (2017)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.23321

Abstract

Atmospheric pressure acid leaching process is one of nickel laterite processing which has a big potential to be applied in industry. The leaching process is influenced by several factors and one of them is concentration of acid as leachant. The purpose of this present study is to learn the effect of concentration of citric acid  on the use of shrinking core kinetic model. The process was done by varying citric acid concentration at 0.1, 1, and 2 M. The other operation conditions, such as particle size, solid-liquid ratio, temperature, stirring speed, and leaching process were kept constant at 125-150 μm, 0,2 sample mass/volume of acid solution, 85 oC, 200 rpm, and 120 minutes, respectively. The experimental results showed that the higher concentration of citric acid was used, the higher the percentage recovery of nickel was obtained. In addition, the validity test of shrinking core model indicated a positive impact to describe physical phenomenon of leaching process.ABSTRAKProses atmospheric pressure acid leaching merupakan salah satu proses pengolahan nikel laterit yang berpotensi untuk diaplikasikan dalam skala industri. Proses leaching ini dipengaruhi oleh beberapa faktor, diantaranya konsentrasi asam sebagai leachant. Studi ini dilakukan dengan tujuan untuk mempelajari pengaruh konsentrasi asam sitrat terhadap penggunaan model kinetika shrinking core dalam proses leaching nikel laterit. Proses leaching dilakukan dengan memvariasikan konsentrasi asam sitrat sebesar 0,1; 1,0, dan 2,0 M. Kondisi operasi lainnya, seperti ukuran partikel, rasio padat-cair, suhu, kecepatan pengadukan, dan lama proses dijaga konstan pada 125-150 μm, 0,2 massa sampel/volume larutan asam, 85 oC, 200 rpm, dan 120 menit, secara berurutan. Hasil percobaan menunjukkan bahwa semakin tinggi konsentrasi asam sitrat yang digunakan, maka semakin tinggi pula nilai persentase recovery nikel yang diperoleh. Selain itu, uji validitas model shrinking core terhadap data percobaan menunjukkan dampak yang positif dalam mendeskripsikan fenomena fisis proses leaching. 
Studi Kinetika Proses Atmospheric Pressure Acid Leaching Bijih Laterit Limonit Menggunakan Larutan Asam Nitrat Konsentrasi Rendah Wanta, Kevin Cleary; Tanujaya, Felisha Hapsari; Susanti, Ratna Frida; Petrus, Himawan Tri Bayu Murti; Perdana, Indra; Astuti, Widi
Jurnal Rekayasa Proses Vol 12, No 2 (2018)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (671.213 KB) | DOI: 10.22146/jrekpros.35644

Abstract

A B S T R A C TKinetics study of atmospheric pressure acid leaching (APAL) process is indispensable for extractor design in an industrial scale. So far, the kinetic model used for this process is the shrinking core model. In this study, the shrinking core model was evaluated against experimental data for laterite leaching process using a solution of low concentration nitric acid (0.1 M). Variations in temperature and particle size were carried out at 303–358 K and <75–250 microns. Other operating conditions, such as pulp density, stirring speed, and time were kept at 20% w/v, 200 rpm, and 120 minutes, respectively. The model evaluation results showed that the shrinking core model was not suitable for this process because the process controlling stage is not just one stage only.Keywords: kinetics; laterite; leaching; shrinking core.A B S T R A KStudi terkait kinetika proses atmospheric pressure acid leaching (APAL) sangat diperlukan untuk proses perancangan ekstraktor dalam skala industri. Selama ini, model kinetika yang digunakan untuk proses tersebut adalah model shrinking core. Dalam studi ini, model shrinking core dievaluasi terhadap data percobaan proses leaching bijih laterit dengan menggunakan larutan asam nitrat konsentrasi rendah, 0,1 M. Variasi suhu dan ukuran partikel dilakukan pada 303–358 K dan <75–250 mikron. Kondisi operasi lainnya, seperti densitas pulp, kecepatan pengadukan, dan lama proses dijaga tetap pada 20%b/v, 200 rpm, dan 120 menit, secara berurutan. Hasil evaluasi model menunjukkan bahwa model shrinking core tidak cocok untuk proses ini karena tahapan pengendali proses tidak hanya satu tahapan saja.Kata kunci: kinetika; laterit; leaching; shrinking core