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Vanadium extraction method of sodium-modified vanadium extraction tailings

A technology for sodium extraction of vanadium and tailings, which is applied in the direction of improving process efficiency, can solve environmental pollution and other problems, and achieve the effects of high degree of cleanliness, good economic and social benefits, and low production costs

Active Publication Date: 2020-12-18
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main treatment method is to use the pyrotechnic process, that is, add sodium salt to the tailings, roast at 600°C and then leach to obtain a vanadium-containing solution, which will be further concentrated and vanadium-precipitated. However, this method will generate certain waste gas and pollute the environment.

Method used

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  • Vanadium extraction method of sodium-modified vanadium extraction tailings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Add 5% by weight of magnesium oxide powder and 0.5% by weight of sodium hexametaphosphate to the tailings of sodium vanadium extraction, then add industrial water according to the volume ratio of 6:1 according to the liquid-solid ratio, and ball mill for 45min in a ball mill to make the oxidized Magnesium, leaching aid and sodium vanadium extraction tailings are fully mixed evenly to form a homogeneous slurry, wherein the particle size of the sodium vanadium extraction tailings is below 0.2mm, and the purity of the magnesium oxide powder is 95% Above, the particle size of the magnesium oxide powder is below 0.074mm; the above slurry is put into a high-pressure reactor, and the hydrothermal reaction is carried out at 200°C, and the reaction time is 30min; the reacted slurry is filtered to obtain Vanadium solution and vanadium extraction residue. It is measured that the leaching rate of vanadium in the tailings of sodium vanadium extraction is as high as 62%.

Embodiment 2

[0069] Add 10% by weight of magnesium oxide powder and 0.2% by weight of sodium hexametaphosphate to the tailings for sodium vanadium extraction, then add industrial water according to the volume ratio of 8:1 according to the liquid-solid ratio, and ball mill for 30 minutes in a ball mill to make the oxidized Magnesium, leaching aid and sodium vanadium extraction tailings are fully mixed evenly to form a homogeneous slurry, wherein the particle size of the sodium vanadium extraction tailings is below 0.15mm, and the purity of the magnesium oxide powder is 98% Above, the particle size of the magnesium oxide powder is below 0.05mm; the above slurry is put into a high-pressure reactor, and a hydrothermal reaction is carried out at 120°C, and the reaction time is 60min; the reacted slurry is filtered to obtain Vanadium solution and vanadium extraction residue. It is measured that the leaching rate of vanadium in the tailings of sodium vanadium extraction is as high as 69%.

Embodiment 3

[0071] Add 8% by weight of magnesium hydroxide fine powder in the tailings of vanadium extraction by sodium, then add industrial water according to the volume ratio of 2:1 according to the liquid-solid ratio, and ball mill for 60min in a ball mill to make the magnesium hydroxide fine powder and sodium The vanadium extraction tailings are fully mixed uniformly to form a homogeneous slurry, wherein the particle size of the sodium vanadium extraction tailings is below 0.2mm, the purity of the magnesium hydroxide fine powder is above 95%, and the The particle size of the magnesium fine powder is below 0.074mm; the above slurry is put into a high-pressure reactor, and the hydrothermal reaction is carried out at 60°C, and the reaction time is 180min; the reacted slurry is filtered to obtain a vanadium-containing solution and extract Vanadium residue. It is measured that the leaching rate of vanadium in the tailings of sodium vanadium extraction is as high as 52%.

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Abstract

The invention relates to the technical field of chemical engineering and resource comprehensive utilization, and discloses a vanadium extraction method of sodium-modified vanadium extraction tailings.The vanadium extraction method comprises the following steps that (1), magnesium oxide powder or magnesium hydroxide fine powder and an optional leaching aid are added into the sodium-modified vanadium extraction tailings, then water is added, mixing and ball-milling are carried out to form a homogeneous slurry; (2), the slurry is put into a high-pressure reaction kettle for hydrothermal reaction; and (3), filtering is carried out after reaction is completed to obtain a vanadium-containing solution and vanadium extraction residues. According to the vanadium extraction method of the sodium-modified vanadium extraction tailings, a full-wet hydrothermal extraction process is adopted, no waste gas is generated, the cleanliness degree is high, and the method is environmentally friendly; compared with a traditional pyrogenic process, the method is low in production cost, the maximum leaching rate of vanadium in the sodium-modified vanadium extraction tailings can reach 69%, a large amount of vanadium can be recycled, and good economic benefits and social benefits are achieved; and the method is simple and feasible in technological operation, and vanadium flakes with the grade being 98%or above can be obtained after the vanadium-containing solution is concentrated and subjected to vanadium precipitation.

Description

technical field [0001] The invention relates to the technical field of chemical industry and resource comprehensive utilization, in particular to a method for extracting vanadium from tailings for vanadium extraction by sodium treatment. Background technique [0002] At present, the vanadium extraction process mainly includes the sodium vanadium extraction process and the calcium vanadium extraction process. Compared with the calcium vanadium extraction process, the sodium vanadium extraction process is relatively mature, the vanadium yield is relatively high, and the cost is relatively low, but a large amount of sodium vanadium extraction tailings will be generated during the production process, and the comprehensive utilization of resources High difficulty. At present, the main treatment method is to use pyrotechnics, that is, adding sodium salt to the tailings, leaching after roasting at 600°C to obtain a vanadium-containing solution, and further vanadium precipitation a...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B7/00
CPCC22B34/22C22B7/006Y02P10/20
Inventor 郝建璋曾冠武
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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