An integrated prediction model of cobalt ion concentration based on oxidation-reduction potential

Abstract Cobalt removal is an important step in zinc hydrometallurgy, in which by adding zinc dust and catalyzer, cobalt ion is gradually removed. Reasonable operation of cobalt removal process requires online detection of cobalt ion concentration, which indicates the current state of cobalt removal. The aim of this paper is to build a model capable of predicting cobalt ion concentration online. A kinetic model was built based on a mechanism study. ORP (oxidation–reduction potential), which can be detected online, was introduced into the kinetic model by applying the kinetics of electrode reaction. The kinetic model shows satisfying tracking ability but limited accuracy. To overcome the limitation in accuracy, a data-driven compensation method was proposed and integrated with the kinetic model. Test results show that the proposed integrated model can provide an accurate prediction of outlet cobalt ion concentration in time.

[1]  Gang Xie,et al.  Mechanism of cobalt removal from zinc sulfate solutions in the presence of cadmium , 2006 .

[2]  G. Houlachi,et al.  The Removal of Cobalt from Zinc Electrolyte by Cementation: A Critical Review , 2000 .

[3]  A. Dib,et al.  Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulphate industrial solution containing copper Part II: Onto zinc powder , 2006 .

[4]  Jari Näsi,et al.  Statistical analysis of cobalt removal from zinc electrolyte using the arsenic-activated process , 2004 .

[5]  Vladimir N. Vapnik,et al.  The Nature of Statistical Learning Theory , 2000, Statistics for Engineering and Information Science.

[6]  Z. Guo,et al.  Activation mechanism of Sb2O3 during removal of cobalt from zinc sulphate solution , 2006 .

[7]  David Dreisinger,et al.  A fundamental study of cobalt cementation by zinc dust in the presence of copper and antimony additives , 1996 .

[8]  J. C. Balarini,et al.  Importance of roasted sulphide concentrates characterization in the hydrometallurgical extraction of zinc , 2008 .

[9]  Suresh K. Bhargava,et al.  An investigation on the effects of Fe (FeIII, FeII) and oxidation reduction potential on the dissolution of synthetic uraninite (UO2) , 2011 .

[10]  Panos M. Pardalos,et al.  A survey of data mining techniques applied to agriculture , 2009, Oper. Res..

[11]  J. R. Carvalho,et al.  Iron recovery from sulphate leach liquors in zinc hydrometallurgy , 2003 .

[12]  Mustafa Birinci,et al.  Reductive leaching of cobalt from zinc plant purification residues , 2011 .

[13]  Tadahisa Nishimura,et al.  Comparison between purification processes for zinc leach solutions with arsenic and antimony trioxides , 1992 .

[14]  Bogdan Gabrys,et al.  Data-driven Soft Sensors in the process industry , 2009, Comput. Chem. Eng..

[15]  M. V. Ruano,et al.  An advanced control strategy for biological nutrient removal in continuous systems based on pH and ORP sensors , 2012 .

[16]  S. Palmas,et al.  Kinetics of cobalt cementation on zinc powder , 1995 .

[17]  T. Østvold,et al.  Norzink removal of cobalt from zinc sulphate electrolytes , 1994 .

[18]  A. Dib,et al.  Mass transfer correlation of simultaneous removal by cementation of nickel and cobalt from sulfate industrial solution containing copper: Part I: Onto rotating zinc electrode disc , 2007 .

[19]  Ruey-Fang Yu,et al.  Possible control approaches of the Electro-Fenton process for textile wastewater treatment using on-line monitoring of DO and ORP , 2013 .

[20]  Davood Moradkhani,et al.  A review on hydrometallurgical extraction and recovery of cadmium from various resources , 2007 .

[21]  Dimitrios Filippou,et al.  The kinetics of cobalt removal by cementation from an industrial zinc electrolyte in the presence of Cu, Cd, Pb, Sb and Sn additives , 2001 .

[22]  Qing-Song Xu,et al.  Support vector machines and its applications in chemistry , 2009 .

[23]  B. Boyanov,et al.  REMOVAL OF COBALT AND NICKEL FROM ZINC SULPHATE SOLUTIONS USING ACTIVATED CEMENTATION , 2004 .

[24]  G. Demopoulos,et al.  The Effect of Solution Constituents and Novel Activators on Cobalt Cementation , 2000 .

[25]  T. Østvold,et al.  Products formed during cobalt cementation on zinc in zinc sulfate electrolytes , 2000 .