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Method for dealing with vanadium slag

A vanadium slag and oxidation roasting technology, applied in the field of metallurgy, can solve the problems of high concentration of sulfuric acid in the leaching solution, large consumption of reagents, and large consumption of auxiliary materials, and achieve high economy and environmental friendliness, high leaching rate and yield, and smoke The effect of less air pollutants

Active Publication Date: 2022-02-25
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium roasting-water immersion method consumes a lot of auxiliary materials and high cost. The material is easy to soften during the roasting process, resulting in ring formation in the kiln body. A certain amount of slag after vanadium extraction needs to be added. The single vanadium conversion rate is low, and the overall vanadium recovery rate is generally less than 80% %
However, the vanadium precipitation process of this process needs to oxidize tetravalent vanadium to pentavalent vanadium in the leach solution, the utilization rate of the oxidant is low, the consumption of reagents is large, and the operation is complicated
In addition, the impurity content in the acid leaching solution is high, especially phosphorus, which causes the phosphorus in the vanadium precipitation product to exceed the standard
At present, the dephosphorization method in vanadium solution generally requires alkaline or weak acidity (pH>2), and the concentration of sulfuric acid in the leaching solution described in this method is high, and it is difficult to dephosphorize from this solution.
[0006] In order to solve the problems such as difficulty in oxidation of a large amount of tetravalent vanadium in the solution, difficulty in dephosphorization and other impurities in the high-acid solution, the present invention is specially proposed

Method used

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  • Method for dealing with vanadium slag

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Such as figure 1 As shown, this example provides a method for treating vanadium slag, the chemical composition (mass percentage) of the vanadium slag used is V 9.15%, Fe 37.49%, Cr 3.04%, P 0.21%.

[0077] Specific steps are as follows:

[0078] (1) Vanadium slag is crushed and finely ground, and sieved with a 70-mesh sieve to obtain coarse metal iron particles (Fe content 93.31wt%), and fine vanadium slag (V 9.81wt%, Fe 32.94wt%, Cr 3.31wt% %, P 0.23wt%).

[0079] (2) Mix the vanadium slag fines obtained in step (1) into 0.8wt% CaCl 2 , Calcined at 800°C for 2 hours to obtain calcined sand.

[0080] (3) The calcine obtained in step (2) is subjected to low-acid high-temperature leaching (impurity leaching), the leaching temperature is 90°C, and the leaching time is 0.5 hours. Add concentrated sulfuric acid to adjust the pH value, and control the pH of the leaching end point to 1.3. The leaching slag A and leaching solution A were obtained, in which the leaching rate...

Embodiment 2

[0084] This example provides a method for treating vanadium slag. The chemical composition (mass percentage) of the vanadium slag used is V9.15%, Fe 37.49%, Cr 3.04%, P 0.21%.

[0085] Specific steps are as follows:

[0086] (1) Vanadium slag is crushed and finely ground, and magnetic separation method (magnetic field strength 40mT) is used to obtain coarse metallic iron particles (Fe content 90.11wt%) and fine vanadium slag (V 9.76wt%, Fe 31.56wt%, Cr 3.36 wt%, P 0.23wt%).

[0087] (2) Mix the vanadium slag fine material obtained in step (1) into 1.0wt% FeCl 2 , Calcined at 850°C for 1.5 hours to obtain calcined sand.

[0088] (3) The calcine obtained in step (2) is subjected to low-acid high-temperature leaching (impurity leaching), the leaching temperature is 95°C, and the leaching time is 1.0 hour. Add concentrated sulfuric acid to adjust the pH value, and control the leaching end point pH to 1.0. The leaching slag A and the leaching solution A were obtained, in which t...

Embodiment 3

[0092] This example provides a method for treating vanadium slag. The chemical composition (mass percentage) of the vanadium slag used is V9.15%, Fe 37.49%, Cr 3.04%, P 0.21%.

[0093] Specific steps are as follows:

[0094] (1) Vanadium slag is crushed and finely ground, and sieved with a sieve with an aperture of 80 mesh to obtain coarse metal iron particles (Fe content 97.25wt%), and fine vanadium slag (V 9.71wt%, Fe 32.86wt%, Cr 3.27wt% %, P 0.22wt%).

[0095] (2) Mix the vanadium slag fines obtained in step (1) into 2wt% MgCl 2 , Calcined at 900°C for 1.0 hour to obtain calcined sand.

[0096](3) The calcine obtained in step (2) is subjected to low-acid high-temperature leaching (impurity leaching), the leaching temperature is 80°C, and the leaching time is 2 hours. Add concentrated sulfuric acid to adjust the pH value, and control the pH of the leaching end point to 1.2. The leaching slag A and leaching solution A were obtained, in which the leaching rate of P was 92%...

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Abstract

The application provides a method for treating vanadium slag, which relates to the field of metallurgy. The method for treating vanadium slag includes: removing coarse metal iron particles in the vanadium slag, and then oxidizing and roasting to obtain calcined sand; leaching the calcined sand at low acid and high temperature to obtain a first leaching slag and a first leachate; The impurity-removed liquid obtained after the impurity removal and dephosphorization of the first leaching liquid, the first leaching slag and sulfuric acid are mixed, and the high-acid low-temperature leaching is performed to obtain the second leaching slag and the second leaching liquid; the second leaching liquid is hydrolyzed to precipitate vanadium Vanadic acid and vanadium-precipitated liquid are obtained, the vanadic acid is calcined to obtain vanadium pentoxide, and the vanadium-precipitated liquid is returned to the low-acid high-temperature leaching for recycling. The method for treating vanadium slag provided by the application has high leaching rate, easy removal of impurities, high economy and environmental friendliness.

Description

technical field [0001] The application relates to the field of metallurgy, in particular to a method for treating vanadium slag. Background technique [0002] Vanadium is an important strategic resource, which is widely used in metallurgy, chemical industry, battery, pigment, glass, optical material, medicine and many other fields. The vanadium slag produced during the smelting process of vanadium-titanium magnetite is currently the most important resource for extracting vanadium. At present, the methods for extracting vanadium from vanadium slag are mainly sodium roasting-water leaching method and calcification roasting-acid leaching method. [0003] Sodium roasting-water leaching vanadium extraction method is the most widely used process at present. By adding a sodiumizing agent for oxidative roasting, the vanadium-iron spinel and other vanadium-containing substances in the vanadium slag are phase-transformed into water-soluble vanadic acid. Sodium and calcine are dissol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B7/00C22B1/02
CPCC22B34/22C22B7/007C22B1/02Y02P10/20
Inventor 张永禄揭晓武李明姚志超郜伟杜光超阮书锋叶露王振文张坤坤崔成旺
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD