A method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag

A high-calcium, high-phosphorus, vanadium slag and vanadium pentoxide technology, which is applied in metallurgy and chemical industry, can solve problems such as rectification purification and chlorination residue treatment difficulties, affecting fluidized bed operation, calcium chloride melting loss, etc. Achieve the effect of improving economic and social benefits, good product quality, reducing production and environmental protection costs

Active Publication Date: 2020-11-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In summary, the existing chlorination vanadium extraction process presents significant technical superiority, but there are still some outstanding problems: (1) the chlorination selectivity is poor, and when the vanadium element in the vanadium resource is chlorinated, it will cause The chlorination of other calcium, magnesium, iron, titanium, silicon, chromium, the calcium chloride etc. that produce will cause melt loss, affect fluidized bed operation, increase the difficulty of rectification purification and chlorination residue treatment simultaneously; (2 ) The existing vanadium chloride extraction process is mainly aimed at ordinary vanadium slag, and there is no efficient chlorination extraction technology for high-calcium and high-phosphorus vanadium slag

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  • A method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag

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Embodiment 1

[0033] figure 1 It is a schematic flow chart of the method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag according to the present invention.

[0034] Calculated on the basis of converted oxides, the composition of a typical high-calcium and high-phosphorus vanadium slag is as follows: 18% V 2 o 5 ,27%CaO,17%FeO,4%P 2 o 5 ,11%SiO2 2 ,8%TiO 2 ,4%Al 2 o 3 ,5%MgO,4%MnO,2%Cr 2 o 3 .

[0035] combine figure 1 , a method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag used in this embodiment, including oxidation granulation process 1, low-temperature chlorination process 2, dust collection and rinsing process 3, rectification Purification process 4, oxidation pulverization process 5 and tailings oxidation process 6 six processes, specifically according to the following steps:

[0036] 1) High-calcium, high-phosphor...

Embodiment 2

[0043] This embodiment adopts the method for preparing high-purity vanadium pentoxide described in Example 1, using fly ash as a silica-rich raw material, with a silica content of 20%, and the addition ratio of fly ash is 90% of the mass of vanadium slag; The operating temperature of the oxidation granulation process 1 is 600°C, and the reaction time is 300min; the fluidized bed reactor is used in the low-temperature chlorination process 2, the chlorination temperature is 300°C, and the molar ratio of carbon monoxide to chlorine is 1.5; A fluidized bed reactor is used in the oxidation pulverization process 5, the oxidation temperature is 150° C., the molar ratio of catalyst pure water to vanadyl chloride is 0.15, and the molar ratio of oxygen to vanadyl trichloride in oxygen-enriched air is introduced into 0.90; In the tailings oxidation step 6, a fluidized bed reactor is used, the reaction temperature is 300° C., and the residence time is 180 minutes. The recovery rate of van...

Embodiment 3

[0045] The present embodiment adopts the method for preparing high-purity vanadium pentoxide described in Example 1, uses quartz sand as the silica-rich raw material, the content of silica is 80%, and the addition ratio of quartz sand is 10% of the mass of vanadium slag; The operating temperature of the oxidation granulation process 1 is 1000°C, and the reaction time is 60min; a fluidized bed reactor is used in the low-temperature chlorination process 2, the chlorination temperature is 700°C, and the molar ratio of carbon monoxide to chlorine is 1.0; the oxidation In powder making process 5, a fluidized bed reactor is adopted, the oxidation temperature is 600° C., the molar ratio of catalyst pure water to vanadyl chloride is 0.01, and the molar ratio of oxygen to vanadyl trichloride in oxygen-enriched air is introduced into 0.75; In tailings oxidation process 6, a fluidized bed reactor is used, the reaction temperature is 1000°C, and the residence time is 30 minutes. The recov...

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Abstract

The invention discloses a method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag. The method includes the six processes of (1) an oxidation granulation process, (2) a low-temperature chlorination process, (3) a dust collection and elution process, (4) a rectification and purification process, (5) an oxidation powderingprocess, and (6) a tailings oxidation process. In this method, an additive is added in the oxidation granulation process, so that calcium in the vanadium slag is converted into a silicate phase or analuminosilicate phase, and the loss of flow caused by a large amount of calcium chlorination is avoided. In the low-temperature chlorination process, carbon monoxide is used as a carbon source to decrease the chlorination temperature and prevent the loss of flow caused by the melting of calcium and magnesium chlorides. In the oxidation powdering process and the tailings oxidation process, the recycling of chlorine gas is realized by blowing oxygen-enriched air. The method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag is suitable for the high-calcium and high-phosphorus vanadium slag and has the advantages of being good in selectivity, low in reaction temperature, having no loss of flow, being environment-friendly, and high in added value of products.

Description

technical field [0001] The invention belongs to the fields of metallurgy and chemical industry, in particular to a method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium and high-phosphorus vanadium slag. 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] Vanadium-titanium magnetite is the main raw material for producing vanadium pentoxide. At present, the industry mainly obtains vanadium-containing molten iron through reduction smelting, and further blows to obtain vanadium slag; then the vanadium slag is prepared through the process of "sodium roasting-leachi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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