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Method for producing high-purity vanadium pentoxide through titanium tetrachloride refined vanadium-removed tailings

A technology of vanadium pentoxide and titanium tetrachloride, which is applied in the direction of vanadium oxide, etc., can solve the problems of low purity of vanadium pentoxide, increased environmental protection costs, and high vanadium-containing hydrochloric acid, so as to achieve good product quality and improve comprehensive utilization , Improve the effect of chlorination selectivity

Active Publication Date: 2020-01-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
  • Claims
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Problems solved by technology

However, this process is only suitable for ordinary vanadium slag, and it is not suitable for the refined vanadium tailings of titanium tetrachloride with high chlorine content.
Moreover, the gas phase hydrolysis process will produce a large amount of vanadium-containing hydrochloric acid, which will increase the cost of environmental protection
Chinese patents CN105984896B, CN105984897B, CN105984899B, CN105984898B, CN105984900B, CN107555478A disclose the technique of producing high-purity vanadium pentoxide as raw material by chlorination process with industrial grade vanadium pentoxide, but these techniques are only applicable to industrial grade vanadium pentoxide Raw materials, it is not suitable for the refining of vanadium tailings from titanium tetrachloride with higher chlorine content
[0007] In summary, the existing tailings treatment process of titanium tetrachloride refining vanadium removal mostly adopts the wet process, which has the problems of long process, low purity of vanadium pentoxide, and large amount of wastewater
The vanadium extraction process by chloride presents significant technical advantages, but it is only suitable for the treatment of ordinary vanadium slag or industrial-grade vanadium pentoxide, and is not suitable for the refined vanadium removal tailings of titanium tetrachloride with higher chlorine content.

Method used

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  • Method for producing high-purity vanadium pentoxide through titanium tetrachloride refined vanadium-removed tailings

Examples

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Effect test

Embodiment 1

[0040] figure 1 It is a schematic flow chart of the method for producing high-purity vanadium pentoxide by refining titanium tetrachloride to remove vanadium tailings according to the present invention.

[0041] The composition of a typical titanium tetrachloride refined vanadium tailings is as follows: 28% V 2 o 5 , 10% SiO 2 , 15% Al 2 o 3 , 25%TiO 2 , 9% Fe 2 o 3 , 13% Cl.

[0042] combine figure 1 , the method for producing high-purity vanadium pentoxide by refining titanium tetrachloride to remove vanadium tailings used in the present embodiment, said method comprising pretreatment process 1, chlorination process 2, dust removal process 3, and rinsing process 4 , rectification and purification process 5, oxidation pulverization process 6 and tailings oxidative dechlorination process 7, specifically according to the following steps:

[0043] 1) Titanium tetrachloride refined vanadium tailings are sent to pretreatment step 1, and oxygen-enriched air and catalyst a...

Embodiment 2

[0052] This embodiment adopts the method for producing high-purity vanadium pentoxide by refining titanium tetrachloride and removing vanadium tailings described in Example 1. In the pretreatment process 1, a fluidized bed reactor is used, the reaction temperature is 150 ° C, and the catalyst is pure. The amount of water used is 10% of the quality of the vanadium tailings refined by titanium tetrachloride, and the residence time is 180min; a fluidized bed reactor is adopted in the chlorination process 2, the reaction temperature is 800°C, and the carbon source is petroleum coke; The dedusting process 3 adopts a gravity settling tower combined with a Venturi dust collector; the leaching process 4 adopts a leaching tower, the leaching medium is a thick vanadyl trichloride liquid, and the leaching tower is a two-stage series connection; the rectifying purification process 5 A two-stage series rectification tower is adopted; a fluidized bed reactor is adopted in the oxidation pulve...

Embodiment 3

[0054] This embodiment adopts the method for producing high-purity vanadium pentoxide by refining titanium tetrachloride and removing vanadium tailings described in Example 1. A fluidized bed reactor is used in the pretreatment process 1, the reaction temperature is 600 ° C, and the catalyst is pure. The amount of water used is 0.1% of the quality of the vanadium tailings refined by titanium tetrachloride, and the residence time is 30 minutes; a fluidized bed reactor is used in the chlorination process 2, the reaction temperature is 300 ° C, and the carbon source is coal powder; The dust removal process 3 adopts a gravity settling tower in combination with a cyclone dust collector; the leaching process 4 adopts a leaching tower, the leaching medium is a thick vanadyl trichloride liquid, and the leaching tower is five stages in series; the rectifying purification process 5 adopts Four stages of rectification towers connected in series; a fluidized bed reactor is used in the oxid...

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Abstract

The invention discloses a method for producing high-purity vanadium pentoxide through titanium tetrachloride refined vanadium-removed tailings. The method includes the seven processes: pre-treatment (1), chlorination (2), dust removal (3), drip washing (4), distillation purification (5), oxidation powdering (6) and tailing oxidation dechlorination (7). According to the method, in the pre-treatmentprocess, the titanium tetrachloride refined vanadium-removed tailings are subjected to oxidation dechlorination to obtain corresponding oxidized slag and circulating chlorine gas; in the process of feeding the oxidized slag into chlorination, selective chlorination of vanadium oxide is achieved, and chlorinated flue gas and chlorinated slag are obtained; the chlorinated flue gas is subjected to the processes of dust removal, drip washing and distillation purification, and high-purity vanadium oxytrichloride is obtained; and high-purity vanadium pentoxide powder is obtained from the high-purity vanadium oxytrichloride under action of oxygen-rich air and a catalyst. The method is suitable for treatment of the vanadium-removed tailings, and has the advantages of high raw material adaptability, good selectivity, low reaction temperature, chlorine gas recycling, energy saving and consumption reduction, environmental friendliness, high product additional value and the like.

Description

technical field [0001] The invention belongs to the fields of chemical industry and energy, and in particular relates to a method for producing high-purity vanadium pentoxide by refining titanium tetrachloride to remove vanadium tailings. Background technique [0002] In recent years, with the rapid development of industrial technology, the rapid development of vanadium-based energy storage materials (all-vanadium redox flow battery electrolyte, lithium vanadate cathode material) and high-performance vanadium-based aerospace alloys (vanadium-aluminum alloy, vanadium-titanium alloy) industry There is a huge demand for high purity vanadium pentoxide. [0003] Titanium tetrachloride is an important intermediate product in the production of titanium dioxide chloride and titanium sponge. Vanadium is a common harmful element in titanium tetrachloride, and its presence will adversely affect the quality of subsequent titanium dioxide chloride and titanium sponge. At present, the i...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80
Inventor 杨海涛朱庆山范川林
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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