Method for selectively separating and extracting vanadium and chromium from solution containing vanadium and chromium

A selective, solution-based technology, applied in the field of vanadium hydrometallurgy, can solve the problems of complex operation, serious environmental pollution, and high cost, and achieve the effect of simple equipment requirements, low process cost, and high-purity extraction

Active Publication Date: 2013-02-13
CHONGQING UNIV
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  • Description
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  • Application Information

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Problems solved by technology

This method uses ion exchange resin purification-precipitation separation method to extract vanadium and chromium. The disadvantage is that it cannot achieve a high degree of separation of vanadium and chromium and obtain high-purity vanadium and chromium products, and the operation is complicated.
For the secondary vanadium and chromium-containing waste liquid after extraction of vanadium and chromium, reducing agents are commonly used in industry to reduce and precipitate it to obtain vanadium-chromium slag, which is then roasted for selective oxidation and then selective leaching to achieve vanadium, chromium Chromium separation, the disadvantage of this method is that the amount of follow-up treatment of vanadium-chromium slag is large, and the amount of sulfuric acid required for selective leaching is large, which makes the cost of this method high and serious environmental pollution

Method used

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  • Method for selectively separating and extracting vanadium and chromium from solution containing vanadium and chromium
  • Method for selectively separating and extracting vanadium and chromium from solution containing vanadium and chromium
  • Method for selectively separating and extracting vanadium and chromium from solution containing vanadium and chromium

Examples

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example 1

[0038] 1.5L vanadium slag leaching solution containing vanadium (83mmol / L) and chromium (57mmol / L), after removing impurities by aluminum sulfate, at 50°C, the pH is based on the molar concentration of V(V) in the waste solution and 3 times of Cr(VI) Add 24g NaHSO to 0.6 times the sum of the molar concentrations 3 , heated and stirred at 65°C for 3h to reduce the vanadium and chromium in the mixed solution. then press H 2 o 2 / V molar ratio is 25 and 30wt% H is added 2 o 2The volume is 240ml, and then heated at 99°C until no more bubbles are generated, and the starch potassium iodide test paper is used to check that it does not turn blue. At this time, vanadium exists in the solution in the form of anion groups, and chromium exists in the form of Cr 3+ form exists.

[0039] Adjust the pH of the solution containing high-valent vanadium and low-valent chromium to 3.3, and the macroporous weakly basic chloride-type anion exchange resin in the exchange column selectively ads...

example 2

[0042] 1.5L vanadium slag leaching solution containing vanadium (83mmol / L) and chromium (57mmol / L), after removing impurities by aluminum sulfate, at 40°C, the pH is based on the molar concentration of V(V) in the waste solution and 3 times of Cr(VI) Add 28g NaHSO to 0.7 times the sum of the molar concentrations 3 , heated and stirred at 65°C for 3h to reduce the vanadium and chromium in the mixed solution. then press H 2 o 2 / V molar ratio is 30 and 30wt% H is added 2 o 2 The volume is 290ml, and then heated at 99°C until no more bubbles are generated, and the starch potassium iodide test paper is used to check that it does not turn blue. At this time, vanadium exists in the solution in the form of anion groups, and chromium exists in the form of Cr 3+ form exists.

[0043] Adjust the pH of the solution containing high-valent vanadium and low-valent chromium to 3.0, and the macroporous weakly basic chloride-type anion exchange resin in the exchange column selectively ad...

example 3

[0046] 1.5L vanadium slag leaching solution containing vanadium (83mmol / L) and chromium (57mmol / L), after removing impurities by aluminum sulfate, at 60°C, the pH is based on the molar concentration of V(V) in the waste solution and 3 times of Cr(VI) Add 32g NaHSO to 0.8 times the sum of the molar concentrations 3 , heated and stirred at 65°C for 3h to reduce the vanadium and chromium in the mixed solution. then press H 2 o 2 / V molar ratio is 25 and 30wt% H is added 2 o 2 The volume is 240ml, and then heated at 99°C until no more bubbles are generated, and the starch potassium iodide test paper is used to check that it does not turn blue. At this time, vanadium exists in the solution in the form of anion groups, and chromium exists in the form of Cr 3+ form exists.

[0047] Adjust the pH of the solution containing high-valent vanadium and low-valent chromium to 3.8, and the macroporous weakly basic chloride-type anion exchange resin in the exchange column selectively ad...

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Abstract

The invention discloses a method for selectively separating and extracting vanadium and chromium from a solution containing the vanadium and the chromium. The method comprises the following steps: (1) NaHSO3 is added to reduce V (V) and Cr (VI) into V (IV) and Cr (III), (2) H2O2 is added to oxidize the V (IV) into V (V), (3) an ion exchange column is used to selectively absorb anions containing the vanadium, and effluent before penetrating is collected, (4) the chromium in the ion exchange column is washed down, and the effluent before penetrating is added to extract the chromium, (5) NaOH is used to elute resin carrying the vanadium to obtain eluant containing the vanadium, (6) ammonium metavanadate is prepared from the eluant and then roasted to obtain V2O5, and (7) the potential of hydrogen (PH)of a chromium solution is adjusted to enable the chromium to be separated out in the form of Cr(OH)3.nH2O, and then Cr2O3 powder is obtained through roasting. The method for selectively separating and extracting the vanadium and the chromium from the solution containing the vanadium and the chromium achieves efficient separation and high-purity extraction of the vanadium and the chromium, the overall recovery rate respectively reaches 82-90 % and 94-99 %, the purity of finished products respectively reaches 96-99 % and 94-97 %.

Description

technical field [0001] The invention relates to a method for effectively extracting vanadium and chromium, in particular to a method for selectively separating and extracting vanadium and chromium from a solution containing vanadium and chromium, and belongs to the field of vanadium hydrometallurgy. [0002] Background technique [0003] In modern industrial technology, vanadium and chromium are important valuable metal elements, both of which are widely used in metallurgical and chemical industries. In the existing blast furnace smelting-converter blowing-vanadium slag sodium roasting-water leaching vanadium extraction process using vanadium-titanium magnetite as raw material, due to the similar properties of chromium and vanadium, the vanadium and chromium in vanadium-titanium magnetite In blast furnace smelting, they are all reduced into molten iron. In converter oxidation smelting, chromium is oxidized together with vanadium into vanadium slag. In the later roasting an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/42C22B34/22C22B34/32
CPCY02P10/20
Inventor 李鸿乂李翠谢兵王雨张涛汪亮
Owner CHONGQING UNIV
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