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

A high-calcium and high-phosphorus vanadium slag and vanadium pentoxide technology, which is applied in the fields of metallurgy and chemical industry, can solve the problems of difficulty in rectification and purification and treatment of chlorinated residues, influence on fluidized bed operation, and loss of flow from calcium chloride melting. Achieve the effect of improving economic and social benefits, good product quality, and reducing production and environmental protection costs

Active Publication Date: 2020-01-14
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 chlor

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  • 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 diagram of the method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium, high-phosphorus vanadium slag according to the present invention.

[0034] Calculated in terms of equivalent oxides, the composition of a typical high-calcium, high-phosphorus vanadium slag is as follows: 18%V 2 O 5 ,27%CaO,17%FeO,4%P 2 O 5 ,11%SiO 2 ,8%TiO 2 ,4%Al 2 O 3 ,5%MgO,4%MnO,2%Cr 2 O 3 .

[0035] Combine figure 1 The method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium, high-phosphorus vanadium slag used in this embodiment includes an oxidation granulation step 1, a low-temperature chlorination step 2, a dust collection and washing step 3, and a distillation The six processes of purification process 4, oxidation powder making process 5 and tailings oxidation process 6 are specifically carried out as follows:

[0036] 1) The high-calcium, high-phosphorus vanadium slag and add...

Embodiment 2

[0043] In this embodiment, the method for preparing high-purity vanadium pentoxide described in embodiment 1 is adopted, and fly ash is used as the raw material rich in silica, the silica content is 20%, and the addition ratio of fly ash is 90% of the mass of vanadium slag; The operating temperature of the oxidation granulation step 1 is 600°C, and the reaction time is 300 minutes; the low-temperature chlorination step 2 uses a fluidized bed reactor, 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 powder making step 5, the oxidation temperature is 150°C, the molar ratio of catalyst pure water to vanadium oxychloride is 0.15, and the molar ratio of oxygen to vanadium oxychloride in oxygen-enriched air is 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 min. The recovery rate of vanadium in th...

Embodiment 3

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

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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, and particularly relates to a method for preparing high-purity vanadium pentoxide by low-temperature chlorination of high-calcium, high-phosphorus vanadium slag. Background technique [0002] In recent years, with the rapid development of industrial technology, the industries of vanadium-based energy storage materials (all-vanadium redox flow battery electrolyte, lithium vanadate cathode material) and high-performance vanadium-based aviation alloys (vanadium aluminum alloy, vanadium-titanium alloy) industries have developed rapidly There is a huge demand for high-purity vanadium pentoxide. [0003] Vanadium-titanium magnetite is the main raw material for the production of vanadium pentoxide. At present, the industry mainly uses reduction smelting to obtain vanadium-containing molten iron, and further smelting to obtain vanadium slag; then, the vanadium slag is used to prepare industrial...

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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