A system for extracting vanadium and preparing vanadium pentoxide from vanadium-chromium-silicon-containing leaching solution and its treatment method

A vanadium pentoxide and leaching solution technology, which is applied in the preparation of vanadium compounds, vanadium oxide, chemical instruments and methods, etc., can solve the problems of large initial investment, affecting purity, and high equipment requirements

Active Publication Date: 2021-03-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Preparation of high-purity V from the leaching solution containing vanadium-chromium-silicon 2 o 5 The vanadium-chromium solution that is not suitable for the formation of heteropolyacids, has relatively high requirements for equipment, large initial investment, and the introduction of other impurities that affect V 2 o 5 The problem of purity, the present invention provides a kind of system and processing method thereof for preparing the system of low-chromium and low-aluminum vanadium pentoxide from vanadium-chromium-silicon solution

Method used

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  • A system for extracting vanadium and preparing vanadium pentoxide from vanadium-chromium-silicon-containing leaching solution and its treatment method

Examples

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Embodiment 1

[0128] This embodiment provides a system and a treatment method for extracting vanadium and preparing vanadium pentoxide from a vanadium-chromium-silicon-containing leach solution:

[0129] The system sequentially includes an impurity removal system, an extraction system, a stripping vanadium precipitation system, a washing system and a calcination system.

[0130] Wherein, the impurity removal system includes the first filter 1, the impurity removal reaction kettle 2, the impurity removal liquid static tank 3 and the second filter 4 connected in sequence, the liquid outlet of the second filter 4 and the material of the extraction system The entrance is connected.

[0131] The extraction system comprises a centrifugal extractor 5, a raffinate storage tank 6 and a vanadium-rich organic phase storage tank 7, the raffinate outlet of the centrifugal extractor 5 is connected to the inlet of the raffinate storage tank 6, and the centrifugal The organic phase outlet of the extractor...

Embodiment 2

[0145] This embodiment provides a system and a treatment method for extracting vanadium and preparing vanadium pentoxide from a vanadium-chromium-silicon-containing leach solution:

[0146] The system is the same as that in Example 1.

[0147] The processing method of the above system is:

[0148] (1) After the leaching solution containing vanadium, chromium and silicon is filtered by the first filter 1, 500mL of the leaching solution containing pentavalent vanadium, hexavalent chromium and silicon is sent to the impurity removal reaction kettle 2, and after constant temperature heating to 60°C, add 5.86 Al of g 2 (SO 4 ) 3 and 0.751 g of CaCl 2 Carry out desiliconization treatment, stir and react for 40 minutes, cool to room temperature and adjust the pH value to 7.7 with sulfuric acid, and then stir for 10 minutes, then send it to the impurity removal liquid standing tank 3 and let it stand for 2 hours, and after the second filter 4 is centrifugally separated and filtere...

Embodiment 3

[0156] This embodiment provides a system and a treatment method for extracting vanadium and preparing vanadium pentoxide from a vanadium-chromium-silicon-containing leach solution:

[0157] The system is the same as that in Example 1.

[0158] The processing method of the above system is:

[0159] (1) After the leaching solution containing vanadium, chromium and silicon is filtered by the first filter 1, 1000 mL of the leaching solution containing pentavalent vanadium, hexavalent chromium and silicon is sent to the impurity removal reaction kettle 2, and after the constant temperature is heated to 70 ° C, 1.056 g Al(OH) 3 and 0.7g CaCl 2 Carry out desiliconization treatment, stir and react for 50 minutes, cool to room temperature and adjust the pH value to 8.0 with sulfuric acid, and then stir for 10 minutes, then put it into the impurity removal liquid standing tank 3 and let it stand for 3 hours, and after centrifugal separation and filtration by the second filter 4, Obta...

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Abstract

The invention provides a system for extracting vanadium from a vanadium-chromium-silicon-containing leaching solution and preparing vanadium pentoxide and a treatment method thereof. The system sequentially includes an impurity removal system, an extraction system, a stripping vanadium precipitation system, and a washing system and calcination system. On the basis of the prior art, the system and method of the present invention have carried out careful research on elements that are easy to deposit in vanadium pentoxide products such as silicon, aluminum and chromium, and through chemical regulation and equipment strengthening, the extraction stock solution, The different polymerization states of impurities such as vanadium-chromium-silicon-aluminum in the impurity removal liquid and raffinate were quantitatively detected, combined with the structure of the extract, based on the quantitative experimental test results, the extraction mechanism of vanadium-chromium-silicon-aluminum was scientifically predicted, and Through chemical regulation and removal of impurities, strengthening of centrifugal extraction equipment and quantitative control of back extraction, a system is formed to realize the preparation of low-chromium, low-silicon, low-aluminum, high-purity vanadium pentoxide products.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy or wastewater treatment, and relates to a system for extracting vanadium from a vanadium-chromium-silicon-containing leaching solution and preparing vanadium pentoxide and a treatment method thereof, in particular to a method for preparing low A system of chromium-low-aluminum vanadium pentoxide and its treatment method. Background technique [0002] Vanadium is a non-ferrous metal and a very important strategic resource. Vanadium pentoxide (V 2 o 5 ) is an important oxide of vanadium and is also the most widely used oxide. The scope of application has expanded from metallurgy, chemical industry and other industries to aerospace, electronic industry, electrochemistry, etc. 2 o 5 The market demand is increasing, the V 2 o 5 The purity requirements of vanadium are also getting higher and higher, especially the development of vanadium redox flow batteries and vanadium aluminum alloys, which put f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
CPCC01G31/003C01G31/02C01P2006/80B01D11/04C22B3/44C22B34/22C22B3/28C22B3/3846Y02P10/20B01D11/0476B01D11/0492
Inventor 曹宏斌宁朋歌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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