Process for abstracting vanadium from iron-smelting waste slag of vanadium -containing iron ore

A technology for vanadium iron ore and waste residue, which is applied in the field of vanadium extraction, can solve the problems of affecting the vanadium extraction rate, the purity of vanadium solution, difficulty in recycling and processing mother liquor, chlorine gas pollution, etc., and achieves the effects of shortening the number of extraction stages, improving the purity, and reducing environmental pollution.

Inactive Publication Date: 2010-07-14
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Part of the reduction method is used before extraction, mainly using iron filings to reduce the vanadium-containing acid immersion solution. This process will increase the iron content in the solution, and iron will also be extracted during the extraction of vanadium, which seriously affects the extraction rate of vanadium and the reaction rate. The purity of the vanadium solution after extraction; and in the current vanadium precipitation process, ammonium salts are mainly used to precipitate pentavalent vanadium in the form of vanadium pentoxide (ie red cake) or ammonium polyvanadate, so the extracted vanadium after reduction The vanadium stripping solution needs to use perchlorate to oxidize V(IV) into V(V), which will generate a large amount of chlorine gas during oxidation, causing serious chlorine gas pollution; in addition, because vanadium pentoxide or ammonium polyvanadate is The solubility is relatively large, and even under the best conditions, a large amount of vanadium ions will remain in the precipitation mother liquor and cannot be precipitated, resulting in difficulties in the recovery and treatment of a large amount of mother liquor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The vanadite ore ironmaking waste slag is leached with 4mol / L dilute sulfuric acid, the leaching temperature is 80°C, and the leaching time is 8h; the ethylene glycol is W (ethylene glycol): W (V 2 o 5 ) = 1:10 into the leaching solution, at a temperature of 40°C, the treatment time is 30 minutes; use the above-mentioned dilute sulfuric acid to adjust the pH value to 2.30-2.50, use P204, TBP and 260# solvent oil mixture (the volume of the three The ratio is 10:5:85) as the extractant, and the three-stage countercurrent extraction is carried out according to the ratio of volume ratio water / oil=2:1, and the extraction rate is 97.27%; the organic reverse extraction is carried out using 1.5mol / L dilute sulfuric acid, and the back extraction The rate reaches 99.25%; Add ammonia water to adjust the pH value to between 7.5 in the aqueous phase after stripping, make tetravalent V (IV) with VO (OH) 2 Precipitated in the form of ferrous sulfate redox titration, the rate of vanad...

Embodiment 2

[0021] The vanadite ore ironmaking waste slag is leached with 3mol / L dilute sulfuric acid, the leaching temperature is 85°C, and the leaching time is 10h; the glycerol is W (glycerol): W (V 2 o 5 ) = 1:8 was added to the leaching solution, at a temperature of 50°C, and the treatment time was 20 minutes; the pH value was adjusted to 2.30-2.50 with the above-mentioned dilute sulfuric acid, and the extraction agent mixed with P204, TBP and 260# solvent oil (the three The volume ratio is 10:5:85) according to the ratio of volume ratio water / oil=2:1 for three-stage countercurrent extraction, the extraction rate is 96.53%; using 1.5mol / L dilute sulfuric acid to extract the organic phase, the stripping rate reaches 99.24%; add ammoniacal liquor to adjust the pH value to 6.8 in the aqueous phase after stripping, make tetravalent V (IV) with VO (OH) 2 It was determined that the rate of vanadium precipitation was 98.04%; finally, the precipitate was calcined in a muffle furnace at 550°...

Embodiment 3

[0023] The vanadite ore ironmaking waste slag was leached with 5mol / L dilute sulfuric acid, the leaching temperature was 75°C, and the leaching time was 12h; the glucose was expressed as W(glucose):W(V 2 o 5 ) = 1:10 into the leaching solution, at a temperature of 80°C, and a treatment time of 2 hours; adjust the pH value to 2.30-2.50 with the above-mentioned dilute sulfuric acid, and use the extraction agent mixed with P204, TBP and 260# solvent oil (the three The volume ratio is 10:5:85) according to the ratio of volume ratio water / oil=2:1 for three-stage countercurrent extraction, the extraction rate is 95.45%; use 1.5mol / L dilute sulfuric acid to extract the organic phase, and the countercurrent extraction rate is 95.45%. Up to 99.20%; add ammonia water to adjust the pH value to 7.5 in the aqueous phase after stripping, so that the tetravalent V (IV) can be converted into VO (OH) 2 It was determined that the vanadium deposition rate was 98.03%; finally, the precipitate wa...

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Abstract

The invention relates to a method for extracting vanadium from ironmaking waste slag of vanadium iron ores. The method comprises the following steps: a. vanadium is leached out of ironmaking waste slag of vanadium iron ores by using dilute sulfuric acids; b. leach solution uses ethylene glycol, glycerin, glucose or sucrose as extraction promoters so as to complex vanadium; c. the pH value of the solution is adjusted, and mixed extracting agents are used for extraction; d. organic phase back extraction is extracted by using dilute sulfuric acids; e. ammonia water is used to adjust the pH valueof the back extraction solution so as to deposit vanadium; f. the deposit is calcined for obtaining vanadium pentexide products with high purity. In the process, no harmful gases such as Cl2 and HCl,etc. are generated, and due to the adoption of ethylene glycol, glycerin, glucose or sucrose to treat the leach solution, no impurity ions are added in the solution; the use of the ammonia water deposition can improve the product purity, and the total extraction rate of vanadium reaches more than 90 percent.

Description

Technical field: [0001] The invention relates to a method for extracting vanadium from vanadium ore ironmaking waste residue. Background technique: [0002] At present, the industrial method of extracting vanadium from iron-making waste residues is mainly wet method, and most of them adopt the method of directly leaching with sulfuric acid or adding sodium chloride and other additives to roast and then soaking in water. The total vanadium extraction rate is about 40% to 50%. , low production efficiency and serious environmental pollution. The traditional process of extracting vanadium from slag is mainly acidic leaching of raw ore—extraction—back extraction—oxidation of stripping liquid—precipitation of vanadium with ammonium salt. Part of the reduction method is used before extraction, mainly using iron filings to reduce the vanadium-containing acid immersion solution. This process will increase the iron content in the solution, and iron will also be extracted during the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/26C22B3/32C22B34/22
CPCY02P10/20
Inventor 金鑫杨静翎
Owner BEIJING UNIV OF CHEM TECH
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