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
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 alkal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for separating and recovering V and Cr from V-Cr waste material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] Weigh 50g vanadium-chromium waste (containing V 2 O 5 5.41%, including Cr 2 O 3 5.78%), add water at a solid-to-liquid ratio of 1:5, stir with a magnetic stirrer, add a total of 14 mL of sulfuric acid while stirring, the pH value of the feed liquid is close to 1.5, continue stirring for 1 hour and filter with a vacuum pump; : 5 add water and stir for 1 hour, filter with a vacuum pump, combine the filtrate, the filtrate volume is 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 two-stage pickling, and water is added according to the ratio of raw material solid to liquid 1:5. After adding sulfuric acid solution while stirring, the pH value of the solution is stabilized at 0.5, and then stirring is continued for 1 hour. The filter cake was washed with water at a solid-to-liquid ratio of 1:4, stirred and washed for 1 hour, filtered with a ...

Example Embodiment

[0043] Example 2

[0044] Weigh 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, add the second-stage acid leaching solution of Example 1 and add clean water. Add sulfuric acid while stirring until the pH value of the solution is stable at 1.5, continue stirring for 1 hour, filter with a vacuum pump, add the washing liquid of the second-stage acid leaching of Example 1 to the filter cake, and add clean water to a solid-liquid ratio of 1:5, stir for 1 After 1 hour, vacuum pump suction filtration, the filter cake is subjected to two-stage acid leaching, and water is added according to the solid-liquid ratio of 1:5, and sulfuric acid is added to the pH value of 0.5 while stirring, and the vacuum pump suction filtration is continued after stirring for 1 hour. 1:4 Add water, stir and wash for 1 hour, and then use a vacuum pump to filter; filter cake drying detection: vanadium (V 2 O 5 t...

Example Embodiment

[0046] Example 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 at a solid-liquid ratio of 1:5, add H while stirring 2 SO 4 Until the pH value of the solution is stabilized at 1.5, continue stirring for 1 hour, filter with a plate-and-frame filter press, and store the filtrate in a pool.

[0049] c), b) the filter cake obtained from the steps is returned to the reactor respectively, and the solid-to-liquid ratio of 1.2 tons of vanadium-chromium waste is added and stirred for 1 hour for 1 hour, 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-to-liquid ratio of 1:5, add sulfuric acid while stirring to make the soluti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22B7/00C22B34/22C22B34/32
CPCY02P10/20
Inventor 全喆田野何景光
Owner 全喆
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products