Pretreatment method for deacidification and impurity removal of acid leaching liquid of vanadium extracted from stone coal

A technology of pretreatment and vanadic acid, applied in the field of vanadium extraction by hydrometallurgy, can solve the problems of low solid-liquid separation efficiency, large consumption of chemicals, excessive vanadium loss rate, etc., so as to improve the efficiency of pretreatment and reduce the consumption of chemicals , the effect of reducing V loss

Active Publication Date: 2016-05-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

These pretreatment methods for extracting vanadium acid leaching solution from stone coal have excessive consumption of reagents, low solid-liquid separation efficiency, easy entrainment of vanadium in the precipitation process, causing problems such as excessive vanadium loss rate, so the present invention proposes a new method Electrochemical adsorption technology, using CDI to pretreat the acid leaching solution for vanadium extraction from stone coal, to achieve the purpose of reducing acid and removing impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The first step, electrode preparation

[0019] Fully mix 3g of mineral activated carbon powder and 9g of ZG-A-PX hydroxide anion powder resin, add 10% binder polyvinylidene fluoride PVDF, 36mL of solvent dimethylacetamide DMAC, and stir well 4h, coated on both sides of the collector pure graphite sheet, dried in an oven at 60°C for 4h, dried in a vacuum oven at 60°C for 4h, and made into 10×3.7cm 2 composite electrode plates.

[0020] The second step, capacitance method pretreatment

[0021] The CDI device is used to adsorb the vanadic acid leaching solution from stone coal reduced by 4g / L sodium sulfite. Use this method to treat vanadium acid leaching solution of one-step stone coal extraction in a certain place in Hubei. The solution volume is 300mL, the initial pH is 0.7, the V concentration is 1115mg / L, the impurity P concentration is 300mg / L, and the Al concentration is 6799mg / L. Voltage is applied during the test 1.0V, liquid flow rate 25mL / min, adsorption at 2...

Embodiment 2

[0026] The first step, electrode preparation

[0027] Fully mix 3g of mineral activated carbon powder and 6g of ZG-A-PX hydroxide anion powder resin, add 10% binder polyvinylidene fluoride PVDF, 27mL of solvent dimethylacetamide DMAC, and stir well 4h, coated on both sides of the collector pure graphite sheet, dried in an oven at 60°C for 4h, dried in a vacuum oven at 60°C for 4h, and made into 10×3.7cm 2 composite electrode sheet.

[0028] The second step, capacitance method pretreatment

[0029] The CDI device is used to adsorb the vanadic acid leaching solution from stone coal reduced by 4g / L sodium sulfite. Use this method to treat vanadium acid leaching solution of one-step stone coal extraction in a certain place in Hubei. The solution volume is 300mL, the initial pH is 0.96, the V concentration is 615mg / L, the impurity P concentration is 89mg / L, and the Al concentration is 2734mg / L. The voltage is applied during the test 2.0V, liquid flow rate 10mL / min, adsorption at...

Embodiment 3

[0033] The first step, electrode preparation

[0034] Fully mix 3g of mineral activated carbon powder and 13g of ZG-A-PX hydroxide anion powder resin, add 10% binder polyvinylidene fluoride PVDF, 36mL of solvent dimethylacetamide DMAC, and stir well 4h, coated on both sides of the collector pure graphite sheet, dried in an oven at 60°C for 4h, dried in a vacuum oven at 60°C for 4h, and made into 10×3.7cm 2 composite electrode sheet.

[0035] The second step, capacitance method pretreatment

[0036] The CDI device is used to adsorb the acid leaching solution for extracting vanadium from stone coal. Use this method to treat vanadium acid leaching solution of one-step stone coal extraction in a certain place in Hubei. The solution volume is 300mL, the initial pH is 0.36, the V concentration is 2815mg / L, the impurity P concentration is 889mg / L, and the Al concentration is 9334mg / L. Voltage is applied during the test 2.0V, liquid flow rate 10mL / min, adsorption at 25°C for 90min. ...

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Abstract

The invention relates to a pretreatment method for deacidification and impurity removal of acid leaching liquid of vanadium extracted from stone coal. Ion exchange resin and carbon materials are used for being prepared into a composite electrode plate which is placed in a capacitive deionization assembly, a direct-current power source is powered on, the acid leaching liquid of vanadium extracted from stone coal is subjected to pretreatment of deacidification and impurity removal, the treated composite electrode plate is in short connection or reverse connection, and the desorption process is performed. The method is little in energy consumption, the pretreatment efficiency is improved, loss of precipitated and mixed V in the solid and liquid separating process is reduced, and therefore the using amount of chemical agents is small, the V loss rate is low, and the impurity removal effect is obvious. The pretreatment method further has the advantages that the technology is flexible, and the method can be used for pretreatment of deacidification and impurity removal of acid leaching liquid of vanadium extracted from stone coal and can also be used for treatment of other high-acid multi-impurity leaching liquid.

Description

technical field [0001] The invention belongs to the field of vanadium extraction by hydrometallurgy, and in particular relates to a pretreatment method for acid-reducing and impurity-removing acid leaching solution for extracting vanadium from stone coal. Background technique [0002] Capacitive deionization technology (CDI) is a new type of water treatment technology developed in recent years. It is characterized by low energy consumption, less pollution, and high efficiency. It is widely used in seawater desalination, industrial wastewater treatment, and industrial desalination. However, in There are few applications in the field of selective impurity removal, and there are only a few studies on the selective removal of Fe and P in industrial wastewater. The patent with the publication number CN104609518A introduces a method for selectively removing Fe from industrial wastewater by electro-adsorption technology. 2+ and / or Fe 3+ The method uses nitrogen-doped sodium micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/42C22B34/22
CPCC22B3/42C22B34/22
Inventor 张一敏周嘉郁包申旭刘涛黄晶
Owner WUHAN UNIV OF TECH
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