Method for the selective separation and recovery of manganese from cobalt and nickel using the shielding effect of mixed extractants

A mixed extraction agent, selective technology, applied in the direction of improving process efficiency, etc.

Active Publication Date: 2015-09-30
KOREA INST OF GEOSCI & MINERAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is easier to recover Co and Ni present in relatively low concentrations from Mn with a 10-fold high concentration difference as described in the above-mentioned literature

Method used

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  • Method for the selective separation and recovery of manganese from cobalt and nickel using the shielding effect of mixed extractants
  • Method for the selective separation and recovery of manganese from cobalt and nickel using the shielding effect of mixed extractants
  • Method for the selective separation and recovery of manganese from cobalt and nickel using the shielding effect of mixed extractants

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Experimental program
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Embodiment approach

[0042] 1. Prepare the water phase (A) and organic phase (O)

[0043] As the water phase, an aqueous solution of Co with a concentration of 1-20 g / L, Mn with a concentration of 1-20 g / L, Ni with a concentration of 1-20 g / L, and Li with a concentration of 1-10 g / L was prepared. Adjust the initial pH to 4-6. Use NH as a pH adjuster 4 OH.

[0044] Next, bis-2-ethylhexyl phosphoric acid (trade name: D2EHPA) and alkyl monocarboxylic acid (trade name: Versatic 10acid) were used as the organic phase. As a mixed extractant, it is prepared by adjusting the concentration range of 0.1M-1M D2EHPA and 0.1M-1M Versatic10acid and mixing. As a diluent, kerosene is used.

[0045] 2. pH-isotherm experiment and countercurrent multi-step extraction

[0046] Add 200 ml of the above-prepared water phase and organic phase to a 1L Pyrex container. At this time, adjust the ratio of O (organic phase) / A (water phase) according to the conditions of 1-2. Measure the pH of the water phase in 1-7.5, move toward...

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Abstract

The present invention provides a method for selectively separating and recovering manganese. The method is characterized in that, for an aqueous solution containing manganese, by using a solvent containing phosphonic acids (phosphonic acid, phosphinic acid, phosphate, phosphoric acid) and an alkyl monocarboxylic acid The mixed extractant is used for solvent extraction to obtain a manganese-containing organic phase. According to the present invention, manganese can be selectively recovered from cobalt and nickel without changing the extraction order of manganese>cobalt>nickel, especially according to the extraction inhibition effect of valuable metals in a specific pH range. In addition, the present invention provides a mixed extractant, which is used in a solvent extraction method that can selectively recover manganese at a pH range of 4-5.

Description

Technical field [0001] The invention relates to a method for selectively recovering only manganese (Mn) from cobalt (Co), nickel (Ni), and lithium (Li) by using a mixed extractant. Background technique [0002] The separation and recovery of valuable metals by solvent extraction is a technique for selectively extracting desired metals in a specific pH portion through a solvent. That is, when M1 as the target metal and M2 as an impurity are present in the aqueous solution, if M1 as the target metal is extracted in a lower pH part and M2 as an impurity is extracted in a higher pH range, it means M1 is easily separated and recovered from M2. [0003] However, it is extremely difficult to extract only Mn by solvent extraction. This is because the physical properties of manganese, cobalt and nickel are similar, so the pH ranges to be extracted are very similar to each other. In particular, the extraction conditions of Mn and Co are similar. Therefore, it is not easy to separate and ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B3/40C22B47/00
CPCY02P10/20C22B3/20C22B47/00
Inventor申宣明朱成浩权雄
OwnerKOREA INST OF GEOSCI & MINERAL RESOURCES