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A new approach to zinc–nickel separation using solution alkalinization method:application to a zinc plant residue

Rare Metals 2020年第11期39卷 1341-1347页

作者： mostafa aghazadeh ghomi Javad Moghaddam Naghi Parvini Ahmadi Materials and Metallurgical Engineering Department Advanced Materials Research CenterSahand University of TechnologyTabriz51335-1996Iran Materials and Metallurgical Engineering Department University of ZanjanZanjan45371-38791Iran

The present investigation involves the separation of zinc and nickel from a sulfate solution using the acidic leaching of zinc plant residue after cadmium removal step as precursor(42.88 wt%Zn,8.50 wt%Cd and 2.33 wt%Ni).Separation of nickel from the solution was done by pouring it into a strong alkaline sodium hydroxide solution due to precipitation of nickel hydroxide and conversion of zinc to the soluble Zn(OH)_(4)^(2-)*** degrees of separation were reached by pouring more diluted solutions into the stronger alkaline *** clear pursue of the process,design of experimental methodology was applied for *** different washing steps on nickel-rich precipitates shows that the washing process decreases zinc content and thereby increases overall selectivity *** show that,at the optimized condition,Ni/Zn weight ratio in the solid product becomes about 104 times higher than the initial ratio in the initial feed solution and a nickel concentrate with 29.98 wt%Ni and 5.99 wt%Zn is *** the same time,the chemical analysis of filtrate shows only 4.4 mg·L^(-1)Ni in the alkaline zinc solution,which means that over 99%nickel is *** study on changes of zinc concentration with time shows that the process could be completed only after few minutes.

关键词： Zinc Nickel Precipitation Separation Alkalinization

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Enhanced selectivity of hydrolytic precipitation of Zn from Zn-Ni sulfate solution via chelation of Ni

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Transactions of Nonferrous Metals Society of China 2018年第12期28卷 2566-2573页

作者： mostafa aghazadeh-ghomi Javad Moghaddam Naghi Parvini Ahmadi Department of Materials Engineering Azarbaijan Shahid Madani University Materials and Metallurgical Engineering department University of Zanjan Faculty of Materials Engineering Sahand University of Technology

The selective precipitation of zinc from zinc-nickel sulfate solution with the Zn/Ni molar ratio of20:1was *** addition of0.5mol/L NaOH solution into the zinc-nickel sulfate solution containing0,0.01,0.02,0.03and0.04mol/L ethylene diamine tetraacetate(EDTA)as a chelating agent was *** equilibrium analysis of precipitation pathway was performed using Visual MINTEQ *** equilibrium analysis showed that the presence of small amounts of EDTA can prevent nickel precipitation in alkaline conditions without any negative effect on zinc *** this basis,more than90%of zinc could be precipitated as a product with about50%Zn and only0.11%Ni at pH=9.0merely as a result of the presence of0.03mol/L EDTA in the *** stirring time of120min after precipitation was found to be essential for more complete *** X-ray diffraction studies on the precipitate revealed that the precipitated phase was Zn4(OH)6SO4.4H2O.

关键词： zinc nickel hydrolytic precipitation separation chelate equilibrium analysis

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