Uji Validitas Model Shrinking Core terhadap Pengaruh Konsentrasi Asam Sitrat dalam Proses Leaching Nikel Laterit

https://doi.org/10.22146/jrekpros.23321

Kevin Cleary Wanta(1*), Himawan TBM Petrus(2), Indra Perdana(3), Widi Astuti(4)

(1) Program Studi Teknik Kimia, Fakultas Teknologi Industri, Universitas Katolik Parahyangan
(2) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No.2 Kampus UGM, Yogyakarta, 55281
(3) Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No.2 Kampus UGM, Yogyakarta, 55281
(4) Balai Penelitian Teknologi Material, Lembaga Ilmu Pengetahuan Indonesia
(*) Corresponding Author

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.


ABSTRAK

Proses 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.

 


Keywords


Citric acid; leaching; nickel laterite; shrinking core



References

Agacayak, T. dan Zedef, V., 2012, Dissolution kinetics of a lateritic nickel ore in sulphuric acid medium, Ročnik, 17, 33-41.


Astuti, W., Hirajima, T., Sasaki, K., Okibe, N., 2015, Kinetics of nickel extraction from Indonesian saprolitic ore by citric acid leaching under atmospheric pressure, Minerals & Metallurgical Processing, 32(3), 176-185.

Astuti, W., Hirajima, T., Sasaki, K., Okibe, N., 2016, Comparison of effectiveness of citric acid and other acids in leaching of low-grade Indonesian saprolitic ores, Minerals Engineering, 85, 1-16.

Ayanda, O., S., Adekola, F., A., Baba, A., A., Fatoki, O., S., Ximba, B., J., 2011, Comparative Study of the Kinetics of Dissolution of Laterite in some Acidic Media, Journal of Minerals & Materials Characterization & Engineering, 10(15), 1457-1472.

Dalvi, A., D., Bacon, W., G., dan Osborne, R. C., 2004, The Past and the Future of Nickel Laterites, PDAC 2004 International Convention, Trade Show & Inventors Exchange.

Kusuma, G. D., 2012, Pengaruh Reduksi Roasting dan Konsentrasi Leaching Asam Sulfat terhadap Recovery Nikel dari Bijih Limonite, Skripsi, Universitas Indonesia.

Kyle, J., 2010, Nickel laterite processing technologies – Where to next?, ALTA 2010 Nickel/Cobalt/Copper Conference, Australia.

Levenspiel, O., 1999, Chemical Reaction Engineering, John Wiley & Sons, New York.

McDonald, R., G. dan Whittington, B., I., 2008, Atmospheric acid leaching of nickel laterites review : Part I. Sulphuric acid technologies, Hydrometallurgy, 91, 35-55.

McDonald, R., G. dan Whittington, B., I., 2008, Atmospheric acid leaching of nickel laterites review : Part II. Chloride and bio-technologies, Hydrometallurgy, 91, 56-69.

Simate, G., S., Ndlovu, S., Walubita, L., F., 2010,The fungal and chemolithotrophic leaching of nickel laterites – Challenges and opportunities, Hydrometallurgy, 103, 150-157.

Sukla, L., B., Behera, S., K., dan Pradhan, N., 2014, Microbial Recovery of Nickel from Lateritic (Oxidic) Nickel Ore : A Review, dalam Geomicrobiology and Biogeochemistry, vol. 39, Springer Berlin Heidelberg, 137-151.

Tzeferis, P., G., 1994, Leaching of a low grade hematitic laterite ore using fungi and biologically produces acid metabolites, Int. J. Miner. Process, 42, 267-283.

Wanta, K., C., Perdana, I., Petrus, H., T., B., M., 2016, Evaluation of shrinking core model in leaching process of Pomalaa nickel laterite using citric acid as leachant at atmospheric conditions, Second International Conference on Chemical Engineering (ICCE) UNPAR, IOP Conf. Series : Materials Science and Engineering, 162, Indonesia.



DOI: https://doi.org/10.22146/jrekpros.23321

Article Metrics

Abstract views : 1046 | views : 1027

Refbacks

  • There are currently no refbacks.




Copyright (c) 2017 Jurnal Rekayasa Proses

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Jurnal Rekayasa Proses  (print ISSN 1978-287X; online ISSN 2549-1490) is published by Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada. View website statistics.