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Vanadium extraction process based on extraction-reverse extraction

A stripping agent and extraction technology, applied in the field of vanadium smelting, can solve the problems of high impurity content of vanadium products, high content of free chloride ions, environmental pollution, etc.

Inactive Publication Date: 2015-02-18
PANZHIHUA XINGCHEN VANADIUM & TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing vanadium extraction process can only target vanadium-containing materials or tailings with high vanadium content. The vanadium content in the waste slag after extraction is still high, containing about 2-5%. The waste of these vanadium will lead to waste of resources. In addition , in this process, the content of free chloride ions in the wastewater is high, causing environmental pollution
If a large amount of acid leaching is used, although the vanadium can be extracted cleanly, the cost is high and the enterprise cannot afford it.
Moreover, a large amount of acid leaching will cause the remaining impurity elements in the slag to be leached, resulting in high impurity content in vanadium products.

Method used

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  • Vanadium extraction process based on extraction-reverse extraction
  • Vanadium extraction process based on extraction-reverse extraction
  • Vanadium extraction process based on extraction-reverse extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 Adopt the method of the present invention to extract vanadium

[0045] 1. Test raw materials

[0046] (1) The chemical composition of vanadium-containing tailings is shown in Table 1;

[0047] Table 1 Chemical composition of vanadium-containing tailings (wt%)

[0048] Element

V 2 o 5

Ca0

SiO 2

Cr 2 o 3

P

TF

content

3.6

21

7.6

2

0.8

19.35

[0049] (2) Specifications of sulfuric acid: industrial sulfuric acid

[0050]

[0051]

[0052] (3) Reducing agent: Na 2 S 2 o 5

[0053] (4) Extractant: 28% P204+6% TBP+66% sulfonated kerosene (volume ratio)

[0054] (5) stripping agent: 2mol / L sulfuric acid

[0055] (6) Vanadium precipitation agent: NH 4 HCO 3

[0056] 2. Test method

[0057] (1) Reductive acid leaching of vanadium-containing materials

[0058] Vanadium-containing material 125Kg (dry basis weight), by weight, water: vanadium-containing material=4: 1, add...

Embodiment 2

[0067] Embodiment 2 Adopt the method of the present invention to extract vanadium

[0068] Carry out according to the method in embodiment 1, difference is, the liquid vanadium content after solid-liquid separation is 4.8g / L, P (0.1g / L), Fe (1.2g / L), Si (0.6g / L) , Al (0.3g / L), Cr (0.2g / L), Mn (2.5g / L). Extractant ratio (volume ratio) 20% P204+6% TBP+74% sulfonated kerosene, the extraction rate of vanadium is 96%, the stripping rate is 98.7%, the vanadium precipitation rate is 99.7%, the purity of vanadium pentoxide: V 2 o 5 (98.2%), P (0.038%), Fe (0.42%), C (0.001%), S (0.001%), Si (0.25%).

Embodiment 3

[0069] Example 3 Using the method of the present invention to extract vanadium

[0070] Carry out according to the method in embodiment 1, difference is, the liquid vanadium content after solid-liquid separation is 4.8g / L, P (0.1g / L), Fe (1.2g / L), Si (0.6g / L) , Al (0.3g / L), Cr (0.2g / L), Mn (2.5g / L). Extractant ratio (volume ratio) 20% P507+6% TBP+74% sulfonated kerosene, the extraction rate of vanadium is 87%, the stripping rate is 98.5%, the vanadium precipitation rate is 99.7%, the purity of vanadium pentoxide: V 2 o 5 (98.05%), P (0.041%), Fe (0.51%), C (0.001%), S (0.001%), Si (0.23%).

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Abstract

The invention relates to a vanadium extraction process based on extraction-reverse extraction and belongs to the technical field of vanadium smelting. The invention aims at providing a method capable of effectively recovering vanadium, particularly vanadium residues with very low vanadium content. The vanadium extraction process by extraction-reverse extraction is carried out on a VOSO4 smelting liquid. The process is characterized by comprising the following steps: a, adding an extraction agent into the VOSO4 smelting liquid and adding a reverse extraction agent into the extracted organic phase for reverse extraction, wherein the extraction agent is a mixture of an acidic extraction agent, a neutral extraction agent and a diluent and the reverse extraction agent is a sulfuric acid solution; and b, adding ammonium salt into a reverse extraction liquid which is an aqueous phase after reverse extraction in the step a for vanadium precipitation, wherein the pH value for vanadium precipitation is 4-7; and washing and calcining to obtain vanadium pentoxide. The vanadium extraction process provided by the invention has the beneficial effects that by adopting the method, the extraction ratio of vanadium is over 99%, the reverse reaction ratio is over 99% and the vanadium precipitation ratio is over 99.5%.

Description

technical field [0001] The invention relates to an extraction-stripping vanadium extraction process, and belongs to the technical field of vanadium smelting. Background technique [0002] my country's vanadium-containing materials are widely distributed. At present, the methods for extracting vanadium from vanadium-containing solid materials mainly include: acid leaching and alkali solution vanadium extraction method, steel slag return vanadium extraction method, sodium roasting vanadium extraction method, direct roasting vanadium extraction method, calcification Roasting vanadium extraction method, solvent extraction vanadium extraction method and ion exchange vanadium extraction method. [0003] Chinese patent applications, CN 201210064463.5 and CN 201210064518.2 propose a method for vanadium extraction by calcification, roasting and cooling of vanadium slag, by calcifying and roasting the vanadium slag containing calcium oxide at 700-950°C, and the time of roasting the pro...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B34/22
CPCY02P10/20
Inventor 雷在荣
Owner PANZHIHUA XINGCHEN VANADIUM & TITANIUM
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