Submitted on: 17 February 1998.
Revised on: 17 March 1998.
Accepted on: 20 April 1998.
___________________HYDROMETALLURGY---ELSEVIER
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Submitted on: 18 May 2019.
Revised on: 26 August 2019.
Accepted on: 27 September 2019.
___________________HYDROMETALLURGY---ELSEVIER
Submitted on: 15 February 2016.
Revised on: 08 April 2016.
Accepted on: 04 June 2016.
___________________HYDROMETALLURGY---ELSEVIER
Submitted on: 11 July 1998.
Revised on: 25 October 1998.
Accepted on: 25 November 1998.
___________________HYDROMETALLURGY---ELSEVIER
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Submitted on: 19 September 2002.
Revised on: 21 October 2002.
Accepted on: 10 November 2002.
___________________HYDROMETALLURGY---ELSEVIER
Submitted on: 14 May 2001.
Revised on: 11 July 2001.
Accepted on: 09 August 2001.
___________________HYDROMETALLURGY---ELSEVIER
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