Hybrid process using ion exchange resins in the selective recovery of nickel and cobalt from leaching effluents

An ion exchange resin, ion exchange technology, applied in the direction of ion exchange, cation exchange, organic cation exchanger, etc.

Inactive Publication Date: 2009-04-22
VALE LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The need for prior pretreatment steps causes a lot of troubles, such as the generation of pulp and the loss of nickel contained in the precipitate, the pulp should be subjected to solid-liquid separation immediately, and then the clarified liquid is supplied to the ion exchange column

Method used

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  • Hybrid process using ion exchange resins in the selective recovery of nickel and cobalt from leaching effluents
  • Hybrid process using ion exchange resins in the selective recovery of nickel and cobalt from leaching effluents

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Embodiment Construction

[0033] It should be noted that a resin (methylaminopyridine group) can be found on the market which is capable of adsorbing nickel in extremely acidic conditions and in the presence of high concentrations of impurities, although it is very expensive for most nickel projects. high. For this resin, none of the procedures that are recommended and suggested in this text apply, since no pretreatment, or even removal of impurities, nor increase of pH is required, so there are no consequences resulting from the preceding steps. inconvenient.

[0034] According to these figures, the proposed technical solution is to omit the pretreatment (neutralization) step of the pulp in order to increase the pH value and precipitate impurities such as iron, aluminum and copper, thereby preventing the loss of nickel in the precipitation through co-precipitation and preventing Solid-liquid separation of the pulp produced in the pretreatment step is required. This approach involves a two-step compo...

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Abstract

The present invention is directed to a hybrid process using ion ex- change resins in the selective recovery of nickel and cobalt of leaching effluents that is comprised of the steps of processing (1 ) the laterite ore (M), which is then treated through leaching (2) (either atmospheric or under pressure), considering solutions from the solid-liquid separation step of existing plants already in operation (2) as well, in a way that the downstream process comprises an ion exchange hybrid circuit, wherein the first ion exchange step (3) with resins (Re) exhibits specific selectivity conditions for the removal of iron, aluminum and copper and an increased pH, and the second ion exchange step (4) allows the removal of nickel and cobalt.

Description

technical field [0001] The present invention relates to a composite method for selectively recovering nickel and cobalt from leach effluents using ion exchange resins, comprising at least two resin steps, especially a composite cycle of two resin steps, the first ion exchange step being responsible for the removal of Iron, aluminum and copper simultaneously raise the pH of the solution, and a second ion exchange step is responsible for the removal of nickel and cobalt. Background technique [0002] As is known to those skilled in the art, several hydrometallurgical processes have now been developed for the extraction of nickel and cobalt present in laterite ores. [0003] The purpose of these methods is to dissolve metallic species by heap or tank leaching with mineral acids at atmospheric pressure and below boiling temperature or in a pressurized vessel. The resulting solution is then subjected to a neutralization step (removal of copper, iron, aluminum) and solid-liquid s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B3/42C22B23/00B01D15/00B01J39/00B01J45/00
CPCC22B23/043C22B23/0461C22B23/0476B01J45/00B01J39/04C22B3/42B01J47/026C22B23/0453Y02P10/20C22B3/24B01D15/00B01J39/00
Inventor R·D·S·考斯塔F·D·曼德斯
Owner VALE LIMITED
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