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A method for preparing vanadium pentoxide by composite extraction

A technology of vanadium pentoxide and composite extractant, which is applied in the field of metallurgy, can solve the problems of increasing the cost of sewage treatment, increasing the cost of sewage treatment, affecting the purity of products, etc., and achieve the goals of reducing sewage treatment cost, increasing yield, and strong extraction capacity Effect

Active Publication Date: 2019-04-05
CHONGQING KOOPPER CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a big problem in this process: since the stripping ability of dioctyl phosphate is not strong, strong acidic conditions are required in the stripping process, and the stripping liquid used has a high acidity, about 1.5-2.5mol / L sulfuric acid solution, and it is necessary to control the small phase (the volume ratio of the organic phase and the aqueous phase) to achieve a higher stripping rate. Alkali is used to neutralize sulfuric acid, which wastes a lot of acid and alkali, which increases the production cost of the process. At the same time, the salt content in the vanadium precipitation mother liquor is high, which not only affects the purity of the product, but also increases the cost of sewage treatment.
However, there are also major problems in this process. The ability of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester to extract vanadium is much weaker than that of dioctyl phosphate, so a higher concentration of 2 is needed when extracting vanadium. -Ethylhexylphosphonic acid mono-2-ethylhexyl ester and a higher pH value of the leaching solution can achieve a higher extraction rate, which will directly lead to more alkali consumption in the extraction process and produce more high-salt wastewater. Increase the cost of sewage treatment

Method used

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  • A method for preparing vanadium pentoxide by composite extraction
  • A method for preparing vanadium pentoxide by composite extraction
  • A method for preparing vanadium pentoxide by composite extraction

Examples

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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 containing vanadium is 0.1 g / L 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 preferred dioctyl p...

Embodiment 2

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

[0058] (1) Leaching: Leach the vanadium-containing material liquid with dilute sulfuric acid, and obtain a leachate containing 0.5 g / L of vanadium 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 the phosphoric acid diester extractant can be dioctyl phosphate or di(1 -methylhexyl) phosphoric acid, the preferred diocty...

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...

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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.

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 0 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
CPCC01G31/003C01G31/02C01P2006/80
Inventor 季尚军
Owner CHONGQING KOOPPER CHEM IND
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