TY - JOUR
T1 - Kinetics of nickel extraction from Indonesian saprolitic ore by citric acid leaching under atmospheric pressure
AU - Astuti, W.
AU - Hirajima, T.
AU - Sasaki, K.
AU - Okibe, N.
N1 - Funding Information:
The authors gratefully acknowledge a Grant-in-Aid for Science Research (No. 24246149), a JSPS Kakenhi – Grant-in-Aid for Scientific Research (A) – Grant No. 15H02333, the Japan Society for the Promotion of Science and the Ministry of Education, Culture, Sports, Science and Technology, Japan, for financial and other support and Dr. M. Zaki Mubarok at Bandung Institute of Technology, Indonesia, for support with regards to saprolitic ore samples.
Publisher Copyright:
Copyright 2015, Society for Mining, Metallurgy & Exploration Inc.
PY - 2015/8
Y1 - 2015/8
N2 - The kinetics of leaching of a saprolitic ore from Indonesia by citric acid solution under atmospheric pressure was investigated. An examination of the effects of leaching temperature, citric acid concentration, pulp density and ore particle size on the dissolution rate of nickel found that they all had significant influence on the rate. The highest nickel recovery (95.6 percent) was achieved under the leaching conditions of ore particle size of 212-355 microns, citric acid concentration of 1 M, leaching time of 15 days, pulp density of 20 weight/volume percent, leaching temperature of 40°C and shaker speed of 200 rpm. The shrinking core model was found to be appropriate for describing the leaching kinetics of this ore in citric acid solutions at atmospheric pressure. The experimental data were well interpreted by this model with rate of reaction controlled by diffusion through the solid product layer. Using the Arrhenius expression, the apparent activation energy for nickel dissolution was evaluated as 12.38 kJ/mol. Finally, on the basis of the shrinking core model, a proposed empirical kinetic model for the leaching of nickel from this Indonesian saprolitic ore was expressed as a mathematical model, which was verified as consistent with the observed experimental results.
AB - The kinetics of leaching of a saprolitic ore from Indonesia by citric acid solution under atmospheric pressure was investigated. An examination of the effects of leaching temperature, citric acid concentration, pulp density and ore particle size on the dissolution rate of nickel found that they all had significant influence on the rate. The highest nickel recovery (95.6 percent) was achieved under the leaching conditions of ore particle size of 212-355 microns, citric acid concentration of 1 M, leaching time of 15 days, pulp density of 20 weight/volume percent, leaching temperature of 40°C and shaker speed of 200 rpm. The shrinking core model was found to be appropriate for describing the leaching kinetics of this ore in citric acid solutions at atmospheric pressure. The experimental data were well interpreted by this model with rate of reaction controlled by diffusion through the solid product layer. Using the Arrhenius expression, the apparent activation energy for nickel dissolution was evaluated as 12.38 kJ/mol. Finally, on the basis of the shrinking core model, a proposed empirical kinetic model for the leaching of nickel from this Indonesian saprolitic ore was expressed as a mathematical model, which was verified as consistent with the observed experimental results.
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U2 - 10.1007/bf03402286
DO - 10.1007/bf03402286
M3 - Article
AN - SCOPUS:84971450134
SN - 2524-3462
VL - 32
SP - 176
EP - 185
JO - Mining, Metallurgy and Exploration
JF - Mining, Metallurgy and Exploration
IS - 3
ER -