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Method for extracting and separating vanadium and chromium from vanadium-chromium slag acid leaching solution

A technology of acid leaching solution and vanadium-chromium slag, applied in the field of metallurgy, can solve the problems of low product purity, energy waste, complicated process, etc.

Inactive Publication Date: 2018-10-23
NORTHEASTERN UNIV LIAONING
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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 extracting and separating vanadium and chromium from vanadium-chromium slag acid leaching solution
  • Method for extracting and separating vanadium and chromium from vanadium-chromium slag acid leaching solution
  • Method for extracting and separating vanadium and chromium from vanadium-chromium slag acid leaching solution

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Effect test

Embodiment 1

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

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

[0048] The pre-oxidation in this step is to pre-oxidize the low-valence vanadium and low-valence chromium in the vanadium-chromium slag pickling solution into the vanadium-chromium slag pickling solution of pentavalent vanadium and hexavalent chromium. For example, the oxidant that can be added can be hydrogen peroxide, sodium hypochlorite, or potassium permanganate.

[0049]S1, add 100.0ml extraction solution to the acid dipping solution in step S0, extract the pentavalent vanadium and hexavalent chromium obtained in step S0 to the organic phase at normal temperature and t...

Embodiment 2

[0061] In this example, vanadium-chromium slag was extracted and separated by acid immersion solution of sodium roasted vanadium-chromium slag. Methods include:

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

[0063] S1, add 120.0ml extraction solution to the acid dipping solution in step S0, extract the pentavalent vanadium and hexavalent chromium obtained in step S0 to the organic phase at normal temperature and then separate with the aqueous phase to obtain the organic phase loaded with vanadium chromium, The single-stage vanadium extraction rate is 88.59%, and the chromium single-stage extraction rate is 90.48%.

[0064] The extract solution is 1-decyl-3-methyl-imidazolium tetrafluoroborate as the extractant, and the organic solvent is n-pentanol to prepare an ionic liquid-pentanol...

Embodiment 3

[0074] In this example, vanadium-chromium slag was extracted and separated by acid immersion solution of sodium roasted vanadium-chromium slag. Methods include:

[0075] S0, 100.0ml pre-oxidized acid leaching solution (containing vanadium 2.5g / L, chromium 0.16g / L), 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 extraction solution to the acid dipping solution in step S0, extract the pentavalent vanadium and hexavalent chromium obtained in step S0 to the organic phase at normal temperature and then separate with the aqueous phase to obtain the organic phase loaded with vanadium chromium, The single-stage vanadium extraction rate is 90.02%, and the chromium single-stage extraction rate is 92.84%.

[0077] The extract solution is 1-dodecyl-3-methyl-imidazolium tetrafluoroborate as the extractant, and the organic solvent is n-pentanol to prepare an ionic liquid-pentanol solution containing 50.0 g / L o...

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Abstract

The invention provides a method for extracting and separating vanadium and chromium from the vanadium-chromium slag acid leaching solution, comprising: S1, using the extraction solution to extract the pentavalent vanadium and hexavalent chromium in the vanadium-chromium slag acid leaching solution to the organic phase and then combine with The aqueous phase is separated to obtain an organic phase loaded with vanadium chromium; S2, using a stripping agent to carry out back extraction of the organic phase loaded with vanadium chromium in step S1, after the stripping ends, obtain chromium-containing back raffinate, ammonium metavanadate or ammonium polyvanadate precipitation and regenerated ionic liquid; S3, calcining the ammonium metavanadate or ammonium polyvanadate precipitation obtained in step S2 at 550°C-600°C to obtain vanadium oxide; S4, stripping step S2 The Cr6+ in the remaining liquid is reduced to form Cr3+, and the chromium is precipitated in the form of precipitation after adjusting the pH of the chromium, which is calcined to obtain Cr2O3. The method of the present invention has high extraction efficiency, rapid stratification after extraction, no emulsification phenomenon, and the ionic liquid has good lipophilic and hydrophobic properties, has good solubility in long-chain alcohols, and is basically immiscible with water, which can reduce the Loss of organic phase due to entrainment or dissolution of the aqueous phase.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 LIAONING
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