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Preparation method of vanadium pentoxide

A technology of vanadium pentoxide and vanadium slag, which is applied in the field of metallurgical vanadium extraction, can solve the problem of low impurity content in products, and achieve the effect of less chemical consumption, low content of impurity elements, and high-efficiency separation

Inactive Publication Date: 2020-02-25
HEBEI IRON AND STEEL
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Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the object of the present invention is to provide a method for preparing vanadium pentoxide, which uses iron salt as a vanadium precipitation agent to purify the vanadium in the vanadium-containing solution, and then undergoes ammonification and transsolution Realize sufficient separation from impurity elements, and prepare high-purity vanadium pentoxide products; the method has a simple process route, less medicament consumption, and low impurity content in the product, meeting the demand for high-purity raw materials

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  • Preparation method of vanadium pentoxide

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[0065] The specific embodiment part of the present invention provides a kind of preparation method of vanadium pentoxide, described method comprises the following steps:

[0066] (1) Precipitating vanadium under acidic conditions after mixing the vanadium-containing solution with iron salt to obtain a vanadium-containing slag phase;

[0067] (2) Mix the vanadium-containing slag phase obtained in step (1) with an ammonizing agent after forming a dispersion liquid, and transfer to dissolve under heating conditions to obtain a purified vanadium liquid;

[0068] (3) cooling and crystallizing the purified vanadium liquid obtained in step (2) and then calcining to obtain a vanadium pentoxide product.

Embodiment 1

[0071] This embodiment provides a method for preparing vanadium pentoxide, using the vanadium-containing solution obtained by extracting vanadium from vanadium slag as the raw material solution, wherein the vanadium content is 24.8g / L, and the content of other elements is respectively iron 92ppm, chromium 351ppm, manganese 25ppm, phosphorus 264ppm, silicon 650ppm calcium 59ppm, magnesium 33ppm, aluminum 21ppm, sodium 19.8g / L, potassium 1.5g / L;

[0072] The process flow diagram of the method is as figure 1 shown, including the following steps:

[0073] (1) Add calcium chloride and aluminum chloride to the vanadium-containing solution, the mol ratio of the calcium in the calcium chloride to the phosphorus in the vanadium-containing solution is 1.1:1, the aluminum in the aluminum chloride and the silicon in the vanadium-containing solution The molar ratio is 1.2:1, stirred and reacted at 70°C for 30 minutes, and filtered to obtain the vanadium-containing solution and the impurit...

Embodiment 2

[0079] The present embodiment provides a kind of preparation method of vanadium pentoxide, the composition of vanadium-containing solution used is identical with embodiment 1; Described method comprises the following steps:

[0080] (1) Add calcium nitrate and aluminum nitrate to the vanadium-containing solution, the molar ratio of calcium in calcium nitrate to phosphorus in the vanadium-containing solution is 1.2:1, and the molar ratio of aluminum in aluminum nitrate to silicon in the vanadium-containing solution is 1.4 : 1, stirred and reacted for 20min at 85°C, filtered to obtain the vanadium-containing solution and the impurity-removed mud after pre-removal;

[0081] (2) Add ferric nitrate to the vanadium-containing solution after the pre-removal of impurities in step (1), the add-on of ferric nitrate is 1.3:1 by the mol ratio of iron element and vanadium in the vanadium-containing solution, adding nitric acid to adjust the pH value is 4. Precipitate vanadium at 60°C under...

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Abstract

The invention provides a preparation method of vanadium pentoxide. The preparation method comprises the following steps of mixing a vanadium-containing solution with an iron salt, and carrying out vanadium precipitation under an acidic condition to obtain a vanadium-containing slag phase; mixing the vanadium-containing slag phase to form a dispersion liquid, mixing the dispersion liquid with an ammonium compound, and carrying out rotating dissolution under a heating condition to obtain a purified vanadium liquid; and cooling and crystallizing the purified vanadium liquid, and then carrying outcalcining to obtain a vanadium pentoxide product. According to the method, the iron salt is taken as a vanadium precipitation medium, vanadium is transferred to a precipitation phase, is separated from various impurities such as chromium, manganese, potassium, sodium and is subjected to ammonium rotating dissolution to realize efficient vanadium iron separation, so that the purity of the vanadiumpentoxide product reaches more than 99.6%, and the mass content of alkali metal and the mass content of alkaline earth metal are controlled to be less than 0.002%. The method is simple in process route, small in medicament consumption, mild in condition and low in cost, can realize cyclic utilization of mediums, meets green environmental protection requirements, and is suitable for industrial scale production applications.

Description

technical field [0001] The invention belongs to the technical field of metallurgical vanadium extraction, and relates to a method for preparing vanadium pentoxide, in particular to a method for preparing vanadium pentoxide with iron salt as an intermediate medium. Background technique [0002] As an important transition metal element, vanadium is widely used in steel, aerospace, chemical industry, electronic technology and other fields. With the improvement and upgrading of downstream application products, it is necessary to obtain high-end, high-tech and deep-processed products. Therefore, the raw material vanadium The grade of oxides, especially vanadium pentoxide, puts forward higher requirements. The existing national standard purity, especially the specific element index, has been difficult to meet the requirements of these high-end products. At present, the most important high-end products in the vanadium application field include aerospace-grade vanadium-aluminum all...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B3/44C01G31/02
CPCC01G31/02C22B3/44C22B34/22Y02P10/20
Inventor 祁健李兰杰柳朝阳赵敏赵备备刘静高晓羽霍红潮
Owner HEBEI IRON AND STEEL
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