Method for preparing vanadium pentoxide through composite extraction

A technology of vanadium pentoxide and composite extractant, which is applied in the field of metallurgy, can solve the problems of increased cost, waste, and large consumption of sewage treatment, and achieve the effects of reducing sewage treatment costs, production costs, and consumption

CN107226484AActive Publication Date: 2017-10-03CHONGQING KOOPPER CHEM IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-10-03

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Abstract

The present invention relates to a vanadium pentoxide preparation method, and provides a method for preparing vanadium pentoxide through composite extraction. The method comprises: (1) leaching; (2) reducing; (3) extracting, wherein a vanadium-containing material liquid is extracted with a composite extractant prepared from a phosphate organic matter and a modifier to prepare a vanadium-containing supported organic phase; (4) carrying out back extraction, wherein the supported organic phase is subjected to back extraction with sulfuric acid or a vanadium-containing sulfuric acid solution to prepare a vanadium-rich liquid; (5) removing acid, wherein the excess acid in the vanadium-rich liquid is extracted; (6) precipitating vanadium; and (7) calcining. According to the present invention, the vanadium is extracted with the composite extractant having strong extraction ability and strong back extraction ability, such that the vanadium extraction rate and the vanadium purity can be improved so as to improve the yield and the product of the vanadium pentoxide product, and the alkali consumption can be reduced so as to reduce the production cost.
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Description

technical field

[0001] The invention relates to the field of metallurgy, in particular to a method for preparing vanadium pentoxide by extracting and extracting vanadium with a composite extractant. Background technique

[0002] Vanadium (element symbol V) is a silver-white refractory rare metal with a high melting point. The main oxide form includes vanadium pentoxide (V 2 o 5 ), and vanadium pentoxide is widely used in metallurgy, chemical industry and other industries. With the rapid development of my country's modernization, the demand for vanadium pentoxide is also increasing. In nature, vanadium ore resources mainly exist in vanadium-titanium magnetite symbiotic with iron ore and stone coal vanadium ore raw materials symbiotic with carbon. The basic principle of extracting vanadium from vanadium-containing raw materials and then preparing vanadium pentoxide is: through The leaching process allows vanadium to enter the liquid phase from the solid phase (such as stone ...

Examples

Embodiment 1

[0045] A method for preparing vanadium pentoxide by composite extraction provided in this embodiment comprises the following steps:

[0046] (1) Leaching: The vanadium-containing material liquid is leached with dilute sulfuric acid, and the leachate with a vanadium content of 0.1 g / L is obtained by controlling the leach liquid-solid ratio.

[0047] (2) Reduction: use 1.2 times the theoretical amount of iron powder for reduction to obtain a vanadium-containing feed solution with a pH of 1.5. The amount of reducing agent added is greater than the theoretical value, which can increase the amount of reducing agent, pentavalent vanadium, and impurity Fe 3+ contact area, improve process reaction efficiency.

[0048] (3) Extraction: the mixed volume fraction is 80% phosphoric acid diester extractant, 10% phosphoric acid monoester extractant and 10% isooctyl alcohol, wherein the phosphoric acid diester extractant can be dioctyl phosphate or di(1 -methylhexyl) phosphoric acid, the pre...

Embodiment 2

[0057] A method for preparing vanadium pentoxide by composite extraction provided in this embodiment comprises the following steps:

[0058] (1) Leaching: The vanadium-containing material liquid is leached with dilute sulfuric acid, and the leachate containing vanadium is 0.5g / L by controlling the leach liquid-solid ratio.

[0059] (2) Reduction: use 1.3 times the theoretical amount of sulfur dioxide for reduction to obtain a vanadium-containing feed solution with a pH of 1.8. The amount of reducing agent added is greater than the theoretical value, which can increase the amount of reducing agent, pentavalent vanadium, and impurity Fe 3+ contact area, improve process reaction efficiency.

[0060] (3) Extraction: the mixed volume fraction is 70% phosphoric acid diester extractant, 20% phosphoric acid monoester extractant and 10% isononyl alcohol, wherein phosphoric acid diester extractant can be dioctyl phosphate or di(1 -methylhexyl) phosphoric acid, the preferred dioctyl pho...

Embodiment 3

[0069] A method for preparing vanadium pentoxide by composite extraction provided in this embodiment comprises the following steps:

[0070] (1) Leaching: Leach the vanadium-containing material liquid with dilute sulfuric acid, and obtain a leach solution with a vanadium content of 3.0 g / L by controlling the leach liquid-solid ratio.

[0071] (2) Reduction: use 1.2 times the theoretical amount of ascorbic acid for reduction to obtain a vanadium-containing feed solution with a pH of 2. The amount of reducing agent added is greater than the theoretical value, which can increase the amount of reducing agent, pentavalent vanadium, and impurity Fe 3+ contact area, improve process reaction efficiency.

[0072] (3) Extraction: the mixed volume fraction is 60% phosphoric acid diester extractant, 30% phosphoric acid monoester extractant and 10% decanol, wherein phosphoric acid diester extractant can be dioctyl phosphate or two (1- Methylhexyl) phosphoric acid, the preferred dioctyl ph...