Studi kinetika proses atmospheric pressure acid leaching bijih laterit limonit menggunakan larutan asam nitrat konsentrasi rendah

Kevin Cleary Wanta (Jurusan Teknik Kimia, Fakultas Teknologi Industri, Universitas Katolik Parahyangan Jl Ciumbuleuit No. 94, Bandung, 40141)
Felisha Hapsari Tanujaya (Jurusan Teknik Kimia, Fakultas Teknologi Industri, Universitas Katolik Parahyangan Jl Ciumbuleuit No. 94, Bandung, 40141)
Ratna Frida Susanti (Jurusan Teknik Kimia, Fakultas Teknologi Industri, Universitas Katolik Parahyangan Jl Ciumbuleuit No. 94, Bandung, 40141)
Himawan Tri Bayu Murti Petrus (Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl Grafika No. 2 Kampus UGM, Yogyakarta, 55281)
Indra Perdana (Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl Grafika No. 2 Kampus UGM, Yogyakarta, 55281)
Widi Astuti (Balai Penelitian Teknologi Mineral, Lembaga Ilmu Pengetahuan Indonesia Jl. Ir. Sutami Km. 15, Tanjung Bintang, Lampung Selatan, 35361)

Jurnal Rekayasa Proses
Vol 12 No 2 (2018): Volume 12, Number 2, 2018

Kinetics 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.