Precipitation of Metals from Liquor Obtained in Nickel Mining

Correa, Mónica Maria Jiménez; Aliprandini, Paula; Tenório, Jorge Alberto Soares; Espinosa, Denise Crocce Romano

doi:10.1002/9781119275039.ch52

Cited by 5 publications

(9 citation statements)

References 10 publications

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“…Despite the results obtained by Jiménez Correa et al, which indicated 60 % of cobalt losses, at pH 4.00 there were lower losses of cobalt (1.09 %). This difference can be attributed to iron concentration.…”

Section: Resultscontrasting

confidence: 57%

“…Equation presents the metal precipitation reaction by OH − , where a metal M +X reacts with hydroxide. However, metals with low concentration can precipitate due to high concentration of other metals (co‐precipitation) . For this reason, co‐precipitation of metals due to high concentration of iron is expected.…”

Section: Methodsmentioning

confidence: 99%

“…The precipitation of the metals increased when the pH increased, and at pH 4.0 all iron precipitated with 60 % of cobalt, 30 % of copper, and 40 % of aluminum. This is known as co‐precipitation, where metal is loaded or incorporated into that which is precipitated when it should be soluble …”

Section: Methodsmentioning

confidence: 99%

“…After leaching, a purification step is necessary to recover valuable metals from the leach solution due to the fact that a high concentration of impurities is still present . Among purification processes, solvent extraction, ion exchange resins, and precipitation are common processes to recover nickel and cobalt from nickel laterite …”

Section: Introductionmentioning

confidence: 99%

“…Chelating resins have the advantage of being selective for metals recovery, while there are losses of valuable metals using the precipitation process to remove impurities, as is the case with the iron precipitation of nickel laterite and the co‐precipitation of cobalt and copper . However, the use of cationic ion exchange resins to recover metals from the solution works better in high pH, in which there is a low H + concentration competing with metals for resin functional group .…”

Section: Introductionmentioning

confidence: 99%

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Recovery of nickel and cobalt from nickel laterite leach solution using chelating resins and pre‐reducing process

et al. 2018

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The aim of this work was to recover nickel and cobalt from a nickel laterite leach solution using chelating resins combined with a pre-reducing process. Sodium sulphite was used as a reducing agent to convert Fe(II) from Fe(III) and increase adsorption efficiency. Batch experiments were performed using synthetic solutions to study the effect of pH in recovering these metals using chelating resins Lewatit TP 207 and Lewatit TP 220. Column experiments were performed to simulate the fixed-bed column process in the following two steps: first, removing copper; and second, recovering nickel and cobalt. Two acids were tested as eluent, namely, sulphuric and hydrochloric acid 1 M and 2 M. Batch experiments showed that increasing the recovery of the metals accompanied an increase in pH. Copper recovery was maximal at pH 2.00, and the resin selectivity changed in pH above 2, decreasing copper adsorption. However, batch experiments showed that nickel and cobalt recovery was higher at pH 3.50, and resin adsorbed a high concentration of contaminants such as iron, zinc, and chromium. For this reason, nickel and cobalt recovery at pH 2.00 was better in column experiments, with less of the contamination in the metals being adsorbed by the resin and a high selectivity for nickel and cobalt. Hydrochloric acid 2 M showed to be more efficient as eluent than sulphuric acid. A precipitation process using NaOH was used to remove contaminants present in the eluent solution, and Cyanex 272 was used to separate cobalt and nickel through the solvent extraction process.

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Section: Resultscontrasting

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recovery of nickel and cobalt from nickel laterite leach solution using chelating resins and pre‐reducing process

et al. 2018

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Recovery of Cu(II) from nickel laterite leach using prereduction and chelating resin extraction: Batch and continuous experiments

et al. 2018

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The processing of laterite ores for nickel and cobalt production is increasing to meet the global demand for these metals. Sulphuric acid is used as a leaching agent, and metals present in the solution may be recovered by many different processes, such as ion exchange. The main problem with nickel limonite layer leach solution is the high concentration of iron, which decreases the efficiency of resin adsorption of nickel and cobalt. The removal of iron by oxidation and precipitation results in nickel, copper, and cobalt losses (co-precipitation). The aim of this work was to investigate the chelating resin extraction to recover copper from a leachate combined with a pre-reduction process, in order to increase the resin's efficiency and to increase its pH above 2.00. The following three synthetic solutions were studied: first, a solution prepared with Fe(III); the second solution was prepared with Fe(II); and the last solution was prepared with Fe(III) using a reducing process. Batch experiments were performed to study the influence of pH and temperature, and column experiments with three solutions were compared in order to verify suitable conditions to recover Cu(II) in a fixed-bed column process.

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Effect of pH and Potential in Chemical Precipitation of Copper by Sodium Dithionite

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Botelho

Espinosa

et al. 2019

The Minerals, Metals &Amp; Materials Series

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Precipitation of Metals from Liquor Obtained in Nickel Mining

Cited by 5 publications

References 10 publications

Recovery of nickel and cobalt from nickel laterite leach solution using chelating resins and pre‐reducing process

Recovery of nickel and cobalt from nickel laterite leach solution using chelating resins and pre‐reducing process

Recovery of Cu(II) from nickel laterite leach using prereduction and chelating resin extraction: Batch and continuous experiments

Effect of pH and Potential in Chemical Precipitation of Copper by Sodium Dithionite

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