A kind of vanadium extraction method of sodium 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, low production cost, and simple and feasible process operation

Active Publication Date: 2022-08-05
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • 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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  • A kind of vanadium extraction method of sodium vanadium extraction tailings

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Experimental program
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Effect test

Embodiment 1

[0067] Add 5% by weight of magnesium oxide powder and 0.5% by weight of sodium hexametaphosphate to the sodium vanadium extraction tailings, then add industrial water according to the volume ratio of liquid-solid ratio of 6:1, and ball mill in a ball mill for 45min to oxidize Magnesium, leaching aid and sodium vanadium extraction tailings are fully mixed to form a homogeneous slurry, wherein the particle size of the sodium vanadium extraction tailings is below 0.2 mm, 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 the autoclave, and the hydrothermal reaction is carried out at 200 ℃, and the reaction time is 30min; Vanadium solution and vanadium extraction residue. The leaching rate of vanadium in the sodium vanadium extraction tailings was measured 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 sodium vanadium extraction tailings, then add industrial water according to the volume ratio of liquid-solid ratio of 8:1, and ball mill in a ball mill for 30 minutes to oxidize Magnesium, leaching aid and sodium vanadium extraction tailings are fully mixed 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 the autoclave, and the hydrothermal reaction is carried out at 120 ° C, and the reaction time is 60min; Vanadium solution and vanadium extraction residue. The leaching rate of vanadium in the sodium vanadium extraction tailings was measured as high as 69%.

Embodiment 3

[0071] Add 8% by weight of magnesium hydroxide fine powder to the sodium vanadium extraction tailings, then add industrial water according to the volume ratio of liquid-solid ratio of 2:1, and ball mill in a ball mill for 60 minutes to make the magnesium hydroxide fine powder and sodium hydroxide The vanadium extraction tailings are fully mixed and uniform, and a homogeneous slurry is formed, wherein the particle size of the sodium vanadium extraction tailings is below 0.2 mm, the purity of the magnesium hydroxide fine powder is above 95%, and the hydroxide The particle size of the magnesium fine powder is below 0.074mm; the above slurry is put into an autoclave, 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. The leaching rate of vanadium in the sodium vanadium extraction tailings was measured as high as 52%.

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Abstract

The invention relates to the technical field of chemical industry and comprehensive utilization of resources, and discloses a vanadium extraction method for sodium vanadium extraction tailings. The method comprises the following steps: (1) adding magnesium oxide powder or magnesium hydroxide fine powder and an optional leaching aid to the sodium vanadium extraction tailings, then adding water, mixing and ball milling to form a homogeneous slurry; (2) The slurry is placed in an autoclave to carry out a hydrothermal reaction; (3) after the reaction is completed, filter to obtain a vanadium-containing solution and a vanadium extraction residue. The invention adopts the whole wet hydrothermal extraction process, does not generate waste gas, has a high degree of cleanliness, and is environmentally friendly; compared with the traditional pyrotechnic process, the method of the invention has low production cost, and the vanadium in the vanadium tailing slag is extracted by sodiumization. The leaching rate can reach up to 69%, and a large amount of vanadium can be recovered, which has good economic and social benefits; the method of the invention is simple and feasible, and the vanadium-containing solution can be concentrated and precipitated after vanadium. % or more flake vanadium.

Description

technical field [0001] The invention relates to the technical field of chemical industry and comprehensive utilization of resources, in particular to a vanadium extraction method for sodium vanadium extraction tailings. Background technique [0002] At present, the vanadium extraction process mainly includes sodium vanadium extraction process and calcium extraction vanadium extraction process. Compared with the sodium vanadium extraction process, the sodium vanadium extraction process is relatively mature, the yield of vanadium 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 the pyrotechnic process, that is, adding sodium salt to the tailings, leaching after roasting at 600 ° C, to obtain a vanadium-containing solution, and further precipitation of vanadi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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