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Method for extracting vanadium from low-grade vanadium-containing raw material and recycling wastewater

A waste water circulation and low-grade technology, applied in the field of vanadium extraction and metallurgy, can solve the problems of unqualified vanadium product quality, sodium salt influence, etc., and achieve the effect of good application prospects

Pending Publication Date: 2022-04-15
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems existing in the prior art that the use of sodium salt in the reduction process affects the recycling of process water and the quality of vanadium products is unqualified during the reduction of vanadium-containing materials to extract vanadium, and to provide a method of using low-grade vanadium-containing A method for extracting vanadium from vanadium raw materials and recycling wastewater. This method can realize recycling of process water while extracting vanadium, and has a good application prospect

Method used

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  • Method for extracting vanadium from low-grade vanadium-containing raw material and recycling wastewater
  • Method for extracting vanadium from low-grade vanadium-containing raw material and recycling wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0068] (1) Add 1000g of the stone coal roasting clinker in Table 1 and 8g of calcium sulfite to 2000mL of water for beating, then add sulfuric acid, and leaching under stirring conditions, the leaching temperature is 25°C, and the leaching time is 100min , the pH value of leaching is 1.5, uses lime to adjust the pH value of system to 2.3 after leaching finishes, then solid-liquid separation obtains 1029g residue (V 2 o 5 content is 0.21% by weight) and leaching solution, the rate of vanadium transfer leaching is 81.54%;

[0069] (2) Utilize magnesium carbonate to adjust the pH value of the leachate to 6.5 to carry out vanadium precipitation, then filter to obtain vanadium precipitate and primary waste water (TV is 0.02g / L);

[0070] (3) Add 150mL of water (the liquid-solid ratio of water to vanadium precipitate is 11mL / g), 0.8g of zirconium sulfate and sulfuric acid to the vanadium precipitate, and react at 120°C for 30min while stirring, and the pH of the reaction is Value ...

Embodiment 2

[0075] (1) Add 1000g of vanadium ore roasting clinker and 9g of calcium sulfite in 2000mL of water for beating, then add sulfuric acid, and leaching under stirring conditions, the leaching temperature is 25°C, and the leaching time is 120min , the pH value of leaching is 0.8, uses lime to adjust the pH value of system to 2.5 after leaching finishes, then solid-liquid separation obtains 1030g residue (V 2 o 5 content is 0.22% by weight) and leaching solution, the rate of vanadium transfer leaching is 81.21%;

[0076] (2) Utilize magnesium carbonate to adjust the pH value of the leachate to 6.7 to carry out vanadium precipitation, then filter to obtain vanadium precipitate and primary waste water (TV is 0.02g / L);

[0077] (3) Add 180mL of water (the liquid-solid ratio of water to vanadium precipitate is 13mL / g), 1g of zirconium sulfate and sulfuric acid to the vanadium precipitate, and react at 110°C for 60min while stirring, the pH value of the reaction is Be 2.6, solid-liqui...

Embodiment 3

[0082] (1) Add 1000g of the vanadium extraction tailings in Table 1 and 19g of calcium sulfite to 1500mL of water for beating, then add sulfuric acid, and leaching under stirring conditions, the leaching temperature is 25°C, and the leaching time is 20min, The pH value of leaching is 0.9, uses lime to adjust the pH value of system to 2.7 after leaching finishes, then solid-liquid separation obtains 1043g residue (V 2 o 5 content is 0.81% by weight) and leaching solution, the rate of vanadium transfer leaching is 65.33%;

[0083] (2) Utilize magnesium carbonate to adjust the pH value of the leachate to 6.7 to carry out vanadium precipitation, then filter to obtain vanadium precipitate and primary waste water (TV is 0.02g / L);

[0084] (3) Add 250mL water (the liquid-solid ratio of water and vanadium precipitate is 11.5mL / g), 1.2g zirconium sulfate and sulfuric acid in the vanadium precipitate, under the condition of stirring, react at 120 ℃ for 60min, the reaction The pH value...

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Abstract

The invention relates to the technical field of vanadium extraction metallurgy, and discloses a method for extracting vanadium from a low-grade vanadium-containing raw material and recycling wastewater. The method comprises the following steps: (1) adding a low-grade vanadium-containing raw material and calcium sulfite into water for pulping, then adding sulfuric acid for leaching, adjusting the pH value of a system to 2-3 after the reaction is finished, and carrying out solid-liquid separation to obtain residues and leachate; (2) adjusting the pH value of the leachate to 5.5-7 for vanadium precipitation, and filtering to obtain a vanadium precipitate and primary wastewater; (3) adding water, sulfuric acid and a phosphorus removal agent into the vanadium precipitate for reaction, and performing solid-liquid separation to obtain filter residues and vanadium liquid; (4) adding urea into the vanadium liquid to precipitate vanadium, filtering to obtain vanadium hydroxide and secondary wastewater, and calcining the vanadium hydroxide to obtain vanadium pentoxide; the primary wastewater is neutralized by lime and then returns to the step (1) for use; and returning the secondary wastewater to the step (3) for use. According to the method, the recycling of the wastewater can be realized while vanadium is extracted, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction metallurgy, in particular to a method for extracting vanadium by using low-grade vanadium-containing raw materials and recycling waste water. Background technique [0002] Secondary vanadium resources such as stone coal and petroleum ash, spent catalysts, vanadium slag extraction tailings are important raw materials for the production of vanadium oxide. Among them, secondary vanadium resources such as stone coal are used as raw materials to extract vanadium, and the acid leaching-ion exchange-desorption-vanadium precipitation process is mostly used. Since the vanadium extraction process requires the use of sodium salt, there is a problem that the amount of wastewater is large and it is difficult to recycle. [0003] Patent application CN 109797299A discloses a wet vanadium extraction process of stone coal vanadium ore. The main technical idea is to reduce the acidic leaching solution w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22C22B3/44C02F1/66C02F103/16
CPCY02P10/20
Inventor 付自碧饶玉忠申彪蒋霖
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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