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Method for separating and recovering V and Cr from V-Cr waste material

A waste material, vanadium chromium technology, applied in the field of chromium and vanadium recovery, separation of vanadium and chromium, can solve the problems of vanadium and chromium separation and recovery without practical significance, incomplete separation, complicated operation, etc., to facilitate the promotion and implementation of industrialization and facilitate the process The effect of simplification of operation and process

Inactive Publication Date: 2013-10-16
全喆 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the vanadium-chromium waste is leached with acid and the pH value is adjusted to 7-8 under acidic conditions, almost all of the vanadium-chromium will precipitate, and if it is leached with alkali, Cr 2 (V 4 o 9 ) 3 Insoluble, difficult to leaching completely, and its leaching recovery rate is only about 20%, so this process has no practical significance for the separation and recovery of vanadium and chromium in vanadium and chromium waste
Patent Publication No. CN1073414 discloses a method for reclaiming vanadium-chromium from vanadium-chromium-containing wastewater by chemical method. Its principle is to add ferric chloride to generate Fe(VO 3 ) 3 Precipitate, recover vanadium by filtration, add sulfuric acid and ammonium sulfate to the filtrate, chromium generates basic chromium sulfate, adjust alkali with NaOH to generate chromium hydroxide, this process is only practical for dilute solutions with low chromium and vanadium content, and for A large amount of solution has no industrial value, because when the content of vanadium and chromium is large, chromium and vanadium can form co-precipitation, and the separation is not complete
Patent Publication No. CN200910061579.1 discloses a method for recovering vanadium and chromium from vanadium and chromium-containing wastewater by combined leaching with alkali and acid. Although it is improved compared with the previous two methods, if this method is applied in production, there will be A series of problems such as unstable alkali and acid consumption, difficult solid-liquid separation, low lye adsorption rate, high production cost, complicated operation, etc.

Method used

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  • Method for separating and recovering V and Cr from V-Cr waste material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 50g vanadium chromium waste (containing V 2 o 5 5.41%, including Cr 2 o 3 5.78%), add water according to the solid-liquid ratio of 1:5, stir with a magnetic stirrer, add sulfuric acid in total 14mL while stirring, the pH value of the material liquid is close to 1.5, continue to stir for 1 hour and use a vacuum pump to filter; filter cake according to the solid-liquid ratio of 1 : 5 add water and stir for 1 hour, filter with vacuum pump, combine filtrate, filtrate volume 454mL (wherein: V 2 o 5 Concentration 4.81g / L, Cr 2 o 3 Concentration 5.65g / L), adjusted to pH 2.5 with liquid caustic soda. The filter cake is subjected to the second-stage pickling solution, and water is added according to the solid-to-liquid ratio of the raw materials at 1:5. After adding sulfuric acid solution while stirring, the pH value of the solution is stabilized at 0.5, and then continue to stir for 1 hour, filter with a vacuum pump, and store the filtrate. The filter cake was stir...

Embodiment 2

[0044] Take by weighing 50 grams of vanadium-chromium waste (containing V 2 o 5 5.41%, including Cr 2 o 3 5.78%), according to the solid-to-liquid ratio of 1:5 after adding the second-stage acid dipping solution of Example 1 and replenishing clear water. Add sulfuric acid while stirring until the pH value of the solution is stable at 1.5, continue to stir for 1 hour, filter with a vacuum pump, add the washing solution of the second-stage acid leaching of Example 1 to the filter cake, and add clear water to a solid-to-liquid ratio of 1:5, and stir for 1 hour. hour, vacuum pump suction filtration, the filter cake is subjected to two-stage acid leaching, and water is added according to the solid-to-liquid ratio of 1:5, and sulfuric acid is added while stirring until the pH value is 0.5, and the stirring is continued for 1 hour. Add water at 1:4, stir and wash for 1 hour, then use vacuum pump to filter; filter cake drying test: vanadium (V 2 o 5 Total) 0.17%, containing chro...

Embodiment 3

[0047] a), take by weighing 1.2 tons of vanadium-chromium waste, after testing this material contains vanadium (V 2 o 5 Total) 5.52%, chromium (Cr 2 o 3 Total) 5.65%, put into the reactor.

[0048] b) After adding water according to the solid-to-liquid ratio of 1:5, add H while stirring 2 SO 4 Until the pH value of the solution is stable at 1.5, continue stirring for 1 hour, filter with a plate and frame filter press, and store the filtrate in a pool.

[0049] The filter cakes obtained in steps c), b) are respectively returned to the reaction kettle, added water and stirred for 1 hour according to the solid-to-liquid ratio of 1.2 tons of vanadium-chromium waste (the weight of the raw material is 1.2 tons), and then filtered with a plate and frame filter press, and the filtrate is stored, and the filter cake is still Return to the reactor.

[0050] d), add water to the filter cake obtained in step c) according to the raw material weight-solid-liquid ratio of 1:5, add sul...

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Abstract

The invention provides a method for separating and recovering V and Cr from a V-Cr waste material. The process flow of the method comprises the following steps: 1, carrying out two-stage acid dipping; 2, carrying out acidity adjustment oxidation; 3, carrying out ion exchange adsorption, desorbing for V removal, and transiting ion exchange resin; 4, carrying out purification and V precipitation; and 5, carrying out purification and Cr precipitation: removing impurities from a Cr-containing solution which is a raffinate flowed through the third-stage ion exchange resin, and purifying Cr. The method has the advantages of simplification, convenient operation, low energy consumption, realization of the recovery rate of 90% or more, and no pollution to the environment because of no generation of hexavalent Cr in the whole process. The method is an optimally-designed industrial operating method, and is in favor of the industrialized popularization enforcement.

Description

technical field [0001] The invention relates to the field of hydrochemical metallurgy, in particular to a method for separating vanadium and chromium from vanadium-chromium waste and recovering vanadium and chromium. Background technique [0002] In the production process of extracting vanadium from steelmaking slag using vanadium-titanium magnets, the vanadium precipitation mother liquor contains a certain amount of hexavalent chromium. In order to remove chromium ions from vanadium pentoxide and detoxify hexavalent chromium at the same time, a reducing agent must be added Reduce hexavalent chromium to trivalent chromium, and reduce vanadium to low-valence vanadium while reducing chromium, and vanadium chromium generates corresponding Cr 2 (V 4 o 9 ) 3 , and then adjust the pH value to 7-8, most of the chromium will generate Cr(OH) 3 Form co-precipitation with vanadium, after filtration, the filter residue contains more than 5-18% chromium and 4-8% vanadium pentoxide. ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/32
CPCY02P10/20
Inventor 全喆田野何景光
Owner 全喆
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