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Method for recycling vanadium and chromium from wastewater containing vanadium and chromium

A technology for recycling chromium waste water, applied in the field of metal metallurgy, can solve the problems of long process, difficult vanadium oxide products, high waste water treatment cost, reduce waste water generation, high added value of vanadium products, and reduce chemical consumption. Effect

Active Publication Date: 2021-09-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1073414A discloses a method for separating vanadium and chromium in vanadium and chromium wastewater by chemical precipitation. The method first uses iron salts for vanadium precipitation, and the solution after vanadium precipitation is recovered by reduction precipitation. However, this method is due to the introduction of Iron ions will produce iron hydroxide precipitation, making it difficult to obtain qualified vanadium and chromium products
Chinese patent CN101121962A discloses a method for extracting and separating vanadium and chromium using primary-secondary compound amines. This patent is beneficial to the recovery and utilization of vanadium and chromium resources, but the process is relatively complicated and difficult to operate accurately
Chinese patent CN103602819A firstly adds reducing agent to reduce pentavalent vanadium and hexavalent chromium in the solution to tetravalent vanadium and trivalent chromium under certain pH conditions, then co-precipitates tetravalent vanadium and trivalent chromium, and finally adopts alkali leaching Separation and recovery of vanadium and chromium by means of acid leaching; this method has a good separation effect, but there are problems of long process and large consumption of reducing agent and acid and alkali
[0004] At present, the process of resource recovery of vanadium and chromium from vanadium and chromium wastewater generally has the problem of complicated process flow, and the final vanadium product often still needs to go through ammonium salt vanadium precipitation, which will introduce a large amount of ammonium ions, resulting in Subsequent precipitation wastewater is enriched with a large amount of ammonium ions, so that the precipitation wastewater still needs to be deaminized before being returned to the process for reuse. The subsequent wastewater treatment costs are high and the environmental risk is relatively high
In addition, it is often difficult to directly obtain high value-added low-priced vanadium oxide products with existing processes

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  • Method for recycling vanadium and chromium from wastewater containing vanadium and chromium

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Effect test

Embodiment 1

[0038] A method for recycling vanadium chromium from vanadium and chromium waste water, the concrete steps are:

[0039] (1) Get 500mL of vanadium and chromium waste water into the reaction kettle, wherein the vanadium concentration is 10g / L, the chromium concentration is 5g / L, the sulfuric acid solution with a volume concentration of 40% is used to adjust the pH value to 7.0, and press palladium chloride solid The solid-liquid ratio of powder and vanadium, chromium waste water is the ratio of 20mg / L, adds palladium chloride solid powder in vanadium, chromium waste water, obtains reaction solution;

[0040] (2) Then purging the reaction kettle containing the reaction solution in step (1) with hydrogen, then feeding hydrogen until the hydrogen partial pressure is 3MPa, stirring the reaction solution for 4 hours at a reaction temperature of 270° C. to obtain a mixed slurry A , the stirring speed is 1300r / min;

[0041] (3) Carry out solid-liquid separation to mixed slurry A, obt...

Embodiment 2

[0046] A method for recycling vanadium chromium from vanadium and chromium waste water, the concrete steps are:

[0047] (1) Get 400mL of vanadium and chromium waste water into the reaction kettle, wherein the vanadium concentration is 5g / L, the chromium concentration is 3g / L, the sulfuric acid solution with a volume concentration of 45% is used to adjust the pH value to 5.5, and press palladium chloride solid The solid-liquid ratio of powder and vanadium, chromium waste water is the ratio of 15mg / L, adds palladium chloride solid powder in vanadium, chromium waste water, obtains reaction solution;

[0048] (2) Then use hydrogen to purge the reaction kettle containing the reaction solution in step (1), then feed hydrogen until the partial pressure of hydrogen is 4MPa, and stir the reaction solution for 3 hours at a reaction temperature of 260° C. to obtain a mixed slurry A , the stirring speed is 1000r / min;

[0049] (3) Carry out solid-liquid separation to mixed slurry A, obta...

Embodiment 3

[0054] A method for recycling vanadium chromium from vanadium and chromium waste water, the concrete steps are:

[0055] (1) get 600mL vanadium-chromium waste water and add reactor, wherein vanadium concentration is 2g / L, and chromium concentration is 1g / L, adopts the sulfuric acid solution that volume concentration is 50% to adjust pH value to 4.5, and press palladium chloride solid powder and The solid-to-liquid ratio of vanadium and chromium wastewater is a ratio of 10mg / L, adding palladium chloride solid powder to vanadium and chromium wastewater to obtain a reaction solution;

[0056] (2) Then use hydrogen to purge the reaction kettle containing the reaction solution in step (1), then feed hydrogen until the partial pressure of hydrogen is 2MPa, and stir the reaction solution for 2 hours at a reaction temperature of 250°C to obtain a mixed slurry A , the stirring speed is 800r / min;

[0057] (3) Carry out solid-liquid separation to mixed slurry A, obtain precipitation A a...

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Abstract

The invention discloses a method for recycling vanadium and chromium from wastewater containing vanadium and chromium. The method comprises the following steps of adding a catalyst, reacting the wastewater containing vanadium and chromium with hydrogen, and then precipitating and separating to finally obtain vanadium trioxide and chromic oxide. According to the method disclosed by the invention, the wastewater containing vanadium and chromium can be directly subjected to reduction precipitation by utilizing the clean gas hydrogen to obtain the low-valence vanadium precipitate, and the qualified vanadium trioxide product can be obtained after the precipitate is simply washed, so that compared with the prior art, the method disclosed by the invention has the advantages that preparation of an intermediate product ammonium vanadate or ammonium polyvanadate by complex ammonium salt precipitation is omitted, the vanadium pentoxide product is obtained through calcination, and the process is simplified; meanwhile, the generation of ammonia-nitrogen wastewater is avoided; and the added value of the obtained vanadium trioxide product is higher than that of a vanadic oxide product. Meanwhile, the pH value is slightly adjusted, so that the optimal condition for chromium precipitation can be obtained, and the chemical consumption for chromium precipitation and the generation of wastewater are reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for recycling vanadium and chromium from waste water containing vanadium and chromium. Background technique [0002] Vanadium and chromium are important strategic resources and are widely used in metallurgy, chemical industry, national defense, superconductivity and hydrogen storage alloys and other fields. Vanadium and chromium are similar in nature and often exist in vanadium-titanium magnetite in a symbiotic manner. The chromium-containing vanadium slag obtained by blast furnace-converter smelting of vanadium-titanium magnetite is the main raw material for the production of vanadium pentoxide. The mainstream process for extracting vanadium from chromium-containing vanadium slag is sodium roasting-water leaching process, and the process for precipitating vanadium from the leaching solution is mainly ammonium salt vanadium precipitation process. In this process, va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22C22B34/32
CPCC22B7/006C22B34/22C22B34/32Y02P10/20
Inventor 李金惠张国斌刘丽丽谭全银
Owner TSINGHUA UNIV