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

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

Inactive Publication Date: 2008-10-22
BEIJING UNIV OF CHEM TECH
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AI Technical Summary

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 vanadium iron ore iron smelting residue is leached with 4mol / L dilute sulfuric acid, the leaching temperature is 80℃, and the leaching time is 8h; the ethylene glycol is divided into W (ethylene glycol): W(V 2 O 5 ) = 1:10 was added to the leaching solution, at a temperature of 40 ℃, processing time 30min; adjust the pH value to 2.30 ~ 2.50 with the above-mentioned dilute sulfuric acid, use P204, TBP and 260# solvent oil mixture (three volumes The ratio is 10:5:85) as the extractant, the three-stage countercurrent extraction is carried out at the ratio of water / oil=2:1 by volume, and the extraction rate is 97.27%; the organic reverse extraction is carried out with 1.5mol / L dilute sulfuric acid, and the reverse extraction The rate is 99.25%; ammonia water is added to the water phase after stripping to adjust the pH value to between 7.5, so that the tetravalent V(IV) is replaced by VO(OH) 2 The precipitation in the form of precipitation by ferrous sulfate redox titration ...

Embodiment 2

[0021] The vanadite ore iron smelting waste residue is leached with 3mol / L dilute sulfuric acid, the leaching temperature is 85℃, and the leaching time is 10h; 2 O 5 ) = 1:8 was added to the leaching solution, at a temperature of 50 ℃, treatment time 20min; adjust the pH value to 2.30 ~ 2.50 with the above-mentioned dilute sulfuric acid, using the extractant mixed with P204, TBP and 260# solvent oil (the three The volume ratio is 10:5:85) The three-stage countercurrent extraction is carried out at the ratio of water / oil=2:1 by volume, and the extraction rate is 96.53%; the organic reverse extraction is performed with 1.5mol / L dilute sulfuric acid, and the reverse extraction rate is up to 99.24%; add ammonia water to the water phase after stripping to adjust the pH to 6.8, so that the tetravalent V(IV) is replaced by VO(OH) 2 After the determination, the vanadium precipitation rate was 98.04%; finally, the precipitate was calcined in a muffle furnace at 550°C for 1 hour to obtain V...

Embodiment 3

[0023] The vanadite ore iron smelting residue is leached with 5mol / L dilute sulfuric acid, the leaching temperature is 75℃, and the leaching time is 12h; the glucose is divided into W(glucose): W(V 2 O 5 )=1:10 was added to the leaching solution at a temperature of 80°C for a treatment time of 2h; the above-mentioned dilute sulfuric acid was used to adjust the pH to 2.30~2.50, and the extractant mixed with P204, TBP and 260# solvent oil was used (the three The volume ratio is 10:5:85) Three-stage countercurrent extraction is carried out at the ratio of water / oil=2:1 by volume, and the extraction rate is 95.45%; the organic reverse extraction is performed with 1.5mol / L dilute sulfuric acid, and the countercurrent extraction rate is Reach 99.20%; add ammonia water to the water phase after stripping to adjust the pH value to 7.5, so that the tetravalent V(IV) is replaced by VO(OH) 2 After the determination, the precipitation rate of vanadium was 98.03%; finally, the precipitate was c...

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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 value of 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 iron ore iron smelting waste residue. Background technique: [0002] At present, the industrial extraction of vanadium from iron-making waste residues is mainly based on wet methods. Most of the methods are direct leaching with sulfuric acid or water leaching after roasting with additives such as sodium chloride. The total vanadium extraction rate is about 40%-50%. , Low production efficiency and serious environmental pollution. The traditional process of extracting vanadium from slag is mainly acid leaching of raw ore-extraction-stripping-stripping liquid oxidation-ammonium salt vanadium precipitation. Part of the reduction method is used before extraction, mainly using iron filings to reduce the vanadium-containing acid leaching solution. This process will increase the iron content in the solution. During the extraction of vanadium, iron will also be extracted, which will seriously a...

Claims

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Application Information

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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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