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Method for extraction separation of vanadium and chromium from vanadium-chromium slag pickle liquor

A technology of acid leaching solution and vanadium-chromium slag, which is applied in the field of metallurgy and can solve problems such as high pretreatment requirements, energy waste, and complicated processes

Inactive Publication Date: 2017-11-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, an existing Chinese patent discloses a precipitation method to separate vanadium and chromium, but the extraction rate of chromium is not high, and the purity of the product is low due to impurities entrained
In addition, the current literature discloses the separation of vanadium and chromium by ion exchange and electrolysis. Although it is convenient for automation, it has high requirements for pretreatment and serious energy waste, so the process is relatively complicated.

Method used

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  • Method for extraction separation of vanadium and chromium from vanadium-chromium slag pickle liquor
  • Method for extraction separation of vanadium and chromium from vanadium-chromium slag pickle liquor
  • Method for extraction separation of vanadium and chromium from vanadium-chromium slag pickle liquor

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Embodiment 1

[0046] This embodiment provides a method for extracting and separating vanadium and chromium from the acid leaching solution of vanadium-chromium residue, such as figure 1 As shown, the methods include:

[0047] S0, 100.0ml pre-oxidized vanadium-chromium residue acid leaching solution (containing 2.5g / L vanadium and 0.16g / L chromium), using 10-50wt% sulfuric acid to adjust the pH value of the leaching solution to make the pH value 3.

[0048] The pre-oxidation in this step is the vanadium-chromium slag acid leaching solution in which low-valent vanadium and low-valent chromium in the vanadium-chromium slag acid leaching solution are oxidized to pentavalent vanadium and hexavalent chromium in advance. For example, the oxidant that can be added can be hydrogen peroxide, sodium hypochlorite or potassium permanganate.

[0049] S1. Add 100.0ml of extract to the acid leaching solution in step S0, extract the pentavalent vanadium and hexavalent chromium obtained in step S0 into the organic ...

Embodiment 2

[0061] In this embodiment, the acid leaching solution of the sodiumized roasting vanadium chromium residue is used to extract and separate vanadium and chromium. Methods include:

[0062] S0, 100.0ml pre-oxidized vanadium-chromium residue acid leaching solution (containing 2.5g / L vanadium and 0.16g / L chromium), using 10-50wt% sulfuric acid to adjust the pH value of the leaching solution to make the pH value 4.

[0063] S1. Add 120.0ml of the extraction solution to the acid leaching solution in step S0, extract the pentavalent vanadium and hexavalent chromium obtained in step S0 into the organic phase at room temperature and then separate it from the water phase to obtain an organic phase loaded with vanadium and chromium, The single-stage extraction rate of vanadium is 88.59%, and the single-stage extraction rate of chromium is 90.48%.

[0064] The extract is prepared with 1-decyl-3-methyl-imidazole tetrafluoroborate as the extractant and n-pentanol as the organic solvent to prepare...

Embodiment 3

[0074] In this embodiment, the acid leaching solution of the sodiumized roasting vanadium chromium residue is used to extract and separate vanadium and chromium. Methods include:

[0075] S0, 100.0ml pre-oxidized acid leaching solution (containing 2.5g / L vanadium and 0.16g / L chromium), using 10-50wt% sulfuric acid to adjust the pH value of the leaching solution to make the pH value 4.5.

[0076] S1. Add 150.0ml of extract to the acid leaching solution in step S0, extract the pentavalent vanadium and hexavalent chromium obtained in step S0 into the organic phase at room temperature and then separate it from the water phase to obtain an organic phase loaded with vanadium and chromium. The single-stage extraction rate of vanadium is 90.02%, and the single-stage extraction rate of chromium is 92.84%.

[0077] The extract is prepared with 1-dodecyl-3-methyl-imidazole tetrafluoroborate as the extractant and n-pentanol as the organic solvent to prepare an ionic liquid-pentanol solution con...

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Abstract

The invention provides a method for extraction separation of vanadium and chromium from vanadium-chromium slag pickle liquor. The method comprises the steps that S1, pentavalent vanadium and hexavalent chromium in the vanadium-chromium slag pickle liquor are extracted into organic phases through extract liquor and then separated from aqueous phases, and vanadium-chromium-loaded organic phases are obtained; S2, the vanadium-chromium-loaded organic phases obtained in the S1 are subjected to reverse extraction through a stripping agent, and after reverse extraction is completed, chromium-containing raffinate, ammonium metavanadate or ammonium polyvanadate precipitation and regenerative ionic liquid are obtained; S3, the ammonium metavanadate or ammonium polyvanadate precipitation obtained in the S2 is roasted at 550-600 DEG C, and vanadium oxides are obtained; and S4, Cr6+ in the reverse raffinate obtained in the S2 is reduced into Cr3+, after the pH of chromium is adjusted, chromium is precipitated in a precipitation form, and Cr2O3 is obtained through roasting. The method is high in extraction efficiency, layering is rapid after extraction, emulsion is avoided, ionic liquid has good lipophilic-hydrophobic property, has good solubleness in long-chain alcohol and is not mutually soluble with water, and thus organic phase losses caused by aqueous phase inclusion or dissolution can be reduced.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a method for extracting and separating vanadium and chromium from an acid leaching solution of vanadium-chromium residue. Background technique [0002] In modern industrial technology, vanadium and chromium are important valuable metal elements, which are widely used in metallurgical and chemical industries. The heavy metal vanadium and chromium ions contained in the acid leaching solution of vanadium chromium slag have good water solubility and migration ability. If stored in the open air for a long time, they will be dissolved and seeped into the groundwater body, causing serious pollution to the environment and humans. In addition, vanadium and chromium are extremely important rare metals, which are widely used in aviation, automobiles, shipbuilding, and defense industries. [0003] At present, the separation methods of vanadium and chromium mainly include chemical pre...

Claims

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Application Information

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IPC IPC(8): C22B34/32C22B34/22C22B3/26C22B7/04
CPCC22B7/007C22B7/04C22B34/22C22B34/32C22B3/37Y02P10/20
Inventor 李勇魏君怡何金桂蔺鹏刚
Owner NORTHEASTERN UNIV
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