Method for producing high-purity vanadium pentoxide by using vanadium-containing waste residues

A high-purity vanadium pentoxide technology, which is applied in the field of producing high-purity vanadium pentoxide, can solve the problems of low vanadium recovery rate, high water consumption for washing and filtering calcium slag, and low purity of vanadium pentoxide, so as to improve the purity , Increase added value, enhance the effect of market competitiveness

Active Publication Date: 2014-07-16
GANSU JINSHI CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this process has the disadvantages of high water consumption for washing and filtering cal

Method used

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  • Method for producing high-purity vanadium pentoxide by using vanadium-containing waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a) Weighing 150kg of vanadium-containing waste residue and placing it in a reactor, adding 160L of tap water to beating to 35Be, then adding a saturated solution of baking soda, the pH of the seasoning slurry is 9.1, and the temperature is raised to 93°C;

[0029] b), into the CO 2 Gas stirring reaction 8h after ultrasonic treatment 30min, suction filtration and collection of filtrate, the obtained calcium carbonate filter cake is washed with 300L temperature of 80 ℃ tap water, the vanadium content in the calcium slag after washing is 0.026%, and the washing water is returned to the previous step for slurrying. The vanadium recovery rate is 92.43%;

[0030] c), the resulting solution is passed through O at 93°C 2 For 30 minutes, oxidize the low-valent vanadium present in the solution to pentavalent vanadium to increase the yield of vanadium, and then add concentrated sulfuric acid to adjust the pH to 2 for acidification;

[0031] d), after heat preservation and stirri...

Embodiment 2

[0036] a) Weigh 150kg of vanadium-containing waste residue and place it in a reaction kettle, add 150L of tap water to it and beat to 33Be, then add a saturated solution of baking soda, the pH of the seasoning slurry is 9.3, and the temperature is raised to 94°C;

[0037] b), into the CO 2 Gas stirring reaction 8h after ultrasonic treatment for 30min, suction filtration and collection of filtrate, the obtained calcium carbonate filter cake is washed with 350L temperature of 80 ℃ tap water, the vanadium content in the calcium slag after washing is 0.019%, and the washing water is returned to the previous step for slurrying. Vanadium recovery rate is 94.69%;

[0038] c), the resulting solution is passed through O at 94°C 2 For 30 minutes, oxidize the low-valent vanadium present in the solution to pentavalent vanadium to increase the yield of vanadium, and then add concentrated sulfuric acid to adjust the pH to 1.7 for acidification;

[0039] d), after heat preservation and sti...

Embodiment 3

[0044] a) Weighing 150kg of vanadium-containing waste residue and placing it in a reactor, adding 156L of tap water to beating to 34Be, then adding a saturated solution of baking soda, the pH of the seasoning slurry is 9.2, and the temperature is raised to 93°C;

[0045] b), into the CO 2 Gas stirring reaction 8h after ultrasonic treatment 30min, suction filtration and collection of filtrate, the obtained calcium carbonate filter cake is washed with 330L temperature of 80 ℃ tap water, the vanadium content in the calcium slag after washing is 0.027%, and the washing water is returned to the previous step for slurrying. Vanadium recovery rate is 95.73%;

[0046] c), the resulting solution is passed through O at 93°C 2 For 30 minutes, oxidize the low-valent vanadium present in the solution to pentavalent vanadium to increase the yield of vanadium, and then add concentrated sulfuric acid to adjust the pH to 1.9 for acidification;

[0047] d), after heat preservation and stirring...

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Abstract

The invention discloses a method for producing high-purity vanadium pentoxide by using vanadium-containing waste residues, and the method is designed for solving the problems that in the prior art, calcium slags are long in filtration time and large in washing water amount, the recovery rate of vanadium is low, the purity of vanadium pentoxide is low, and the like. The method is implemented by taking vanadium-containing calcium slags discharged in the process of sodium dichromate production as a raw material by virtue of the steps of adding a certain amount of sodium bicarbonate solution into the raw material, stirring and leaching the obtained mixture, feeding CO2 gas for deep leaching, and filtering the obtained product for impurity removal; feeding O2 into the obtained solution so as to oxidize the obtained solution, adding a concentrated sulfuric acid for adjusting the pH value of the obtained product and acidifying the obtained product, and after the obtained product is subjected to heat preservation and curing, filtering and precipitating the obtained product so as to obtain hydrous vanadium pentoxide; heating the hydrous vanadium pentoxide so as to dissolve the hydrous vanadium pentoxide, adjusting the PH value of the dissolved hydrous vanadium pentoxide, and filtering the obtained hydrous vanadium pentoxide so as to remove impurities; adding saturated ammonium chloride into the obtained solution to carry out vanadium precipitation, and filtering, washing and roasting the obtained product so as to obtain vanadium pentoxide. Compared with original methods, the method disclosed by the invention has the advantages that the washing water amount of calcium slags is reduced by 50%, the recovery rate of vanadium is increased by about 4%, and the purity of vanadium pentoxide is increased by over 99%. The utilization rate of vanadium-containing waste residues is improved, and the market competitiveness of products is enhanced.

Description

technical field [0001] The invention belongs to the field of chromium industry, and in particular relates to a method for producing high-purity vanadium pentoxide by using vanadium-containing waste residue. Background technique [0002] Industrial waste slag containing vanadium and chromium is a kind of raw material that is difficult to separate. There is no mature technology in the world to efficiently separate it. It is a method that can effectively separate vanadium and chromium, and realizes the comprehensive utilization of vanadium-containing calcium slag in the chromium salt industry. The residual sodium chromate in the vanadium-containing calcium slag produced can produce qualified vanadium pentoxide. [0003] However, this process has the defects of high water consumption for washing and filtering calcium slag, low vanadium recovery rate, and relatively low purity of final output vanadium pentoxide. Contents of the invention [0004] In order to solve the problem...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22
CPCY02P10/20
Inventor 韩登仑张忠元武开鹏李黎明谢希智杨亮亮
Owner GANSU JINSHI CHEM
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