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Method for extracting vanadium and chromium from mixed solution containing vanadium and chromium

A mixed solution and mixed solution technology, applied in the field of extracting vanadium and chromium, can solve the problems of long process flow, complicated operation and emulsification, and achieve the effect of simple equipment requirements, short process flow and efficient separation

Inactive Publication Date: 2017-09-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the direct precipitation method is simple and low in cost, the separation efficiency is limited and the metavanadate or polyvanadate obtained by precipitation will contain impurity elements
The Chinese patent number is CN1121962A, using the primary amine N-1923 extractant to separate and extract vanadium and chromium, which can produce high-purity vanadium and chromium products, but the disadvantage is that the capacity of the extractant is low, the extraction process is lengthy, and it is easy to produce emulsification Phenomenon, high production cost
Chinese patent No. CN101538652B uses macroporous strong basic resin to separate vanadium and chromium in the green mud leach solution. The process flow is long and the operation is complicated, and the separation of vanadium and chromium is not complete, and finally only qualified products of vanadium can be obtained. Chromium and chromium Recycling in the form of chromium dross

Method used

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  • Method for extracting vanadium and chromium from mixed solution containing vanadium and chromium
  • Method for extracting vanadium and chromium from mixed solution containing vanadium and chromium
  • Method for extracting vanadium and chromium from mixed solution containing vanadium and chromium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A 150mL vanadium-chromium mixed solution containing pentavalent vanadium (100mg / L) and hexavalent chromium (100mg / L) was adjusted to pH 8.0 with sodium hydroxide solution or sulfuric acid. The Dex-V macroporous weakly basic anion exchange resin was added to a magnetic heating stirrer to perform a static adsorption experiment at 25°C. The adsorption time was 40 minutes.

[0031] After testing, the adsorption rates of vanadium (V) and chromium (VI) are 93.76% and 99.50%. The effect of pH on the adsorption rate of V(V) and Cr(VI) is as follows: figure 2 Shown.

[0032] Experiments show that under the optimal adsorption temperature and contact time, the adsorption capacity of Dex-V macroporous weakly basic anion exchange resin for vanadium (V) and chromium (VI) has decreased, and the adsorption rate of vanadium has decreased by up to 5%.

Embodiment 2

[0034] A 150mL vanadium-chromium mixed solution containing pentavalent vanadium (100mg / L) and hexavalent chromium (100mg / L) was adjusted to pH 3.0 with sodium hydroxide solution or sulfuric acid. The Dex-V macroporous weakly basic anion exchange resin was added to a magnetic heating stirrer to perform a static adsorption experiment at 25°C. The adsorption time was 40 minutes.

[0035] Use oxalic acid, hydrochloric acid, sulfuric acid, ascorbic acid and 4% sulfuric acid-ethanol solution to elute the vanadium and chromium resins and compare the desorption rates.

[0036] After testing, the desorption rates of oxalic acid on vanadium (V) and chromium (VI) are 0.38% and 0.46%, respectively; the desorption rates of hydrochloric acid on vanadium (V) and chromium (VI) are 51.05% and 1.38%, respectively; The desorption rates of (V) and chromium (VI) are 70.32% and 1.86%, respectively; the desorption rates of ascorbic acid on vanadium (V) and chromium (VI) are 98.53% and 99.25%, respectivel...

Embodiment 3

[0038] A 150 mL vanadium-chromium mixed solution containing pentavalent vanadium (100mg / L) and hexavalent chromium (100mg / L) was adjusted to pH 3.0 with sodium hydroxide solution or sulfuric acid. The Dex-V macroporous weakly basic anion exchange resin was added to a magnetic heating stirrer for static adsorption experiments at 25°C, and the adsorption time was 40 minutes. After testing, the adsorption rate of vanadium (V) and chromium (VI) can reach 98.83% and 99.87%. The vanadium-containing resin and chromium-containing resin are eluted with 4% sulfuric acid-ethanol solution to reach equilibrium, and the vanadium-containing resin and chromium-containing desorption solution are obtained. The desorption rates of the 4% sulfuric acid-ethanol mixture solution on vanadium (V) and chromium (VI) are respectively tested. It is 2.10% and 96.70%. At this time, vanadium is adsorbed on the resin in the form of anion groups. After the chromate ion groups come into contact with the desorp...

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Abstract

The invention discloses a method for extracting vanadium and chromium from a mixed solution containing the vanadium and the chromium. The method comprises the steps that the vanadium and the chromium in the solution are adsorbed with Dex-V large-pore alkalescent anion exchange resin, so that resin adsorbing the vanadium and the chromium is obtained; then, elution is conducted with a sulfuric acid and ethyl alcohol mixed solution with the concentration being 4%, so that a chromium (III) solution and vanadium-containing resin are obtained; neutralizing treatment is conducted on the chromium-containing solution, so that chromium sesquioxide is obtained; and then, the vanadium-containing resin is desorbed with an alkaline solution, vanadium precipitation treatment is conducted on an obtained vanadium-containing desorption solution, so that vanadium pentoxide is obtained. The method is low in raw material and equipment requirement, simple in operation process, high in efficiency and low in cost. According to the method, the vanadium and the chromium are extracted through adsorption; the adsorption rate of the vanadium (V) can reach 98.83%, and the adsorption rate of the chromium (VI) can reach 99.87%; the desorption rate, on the chromium (VI), of the sulfuric acid and ethyl alcohol mixed solution with the concentration being 4% can reach 96.7%; and the final overall recovery rate of the vanadium can reach 90.57%, and the final overall recovery rate of the chromium can reach 96.52%.

Description

Technical field [0001] The invention belongs to the technical field of heavy metal resource recovery, and specifically relates to a method for extracting vanadium and chromium from a vanadium-chromium-containing mixed liquid. Background technique [0002] Vanadium and chromium are important metal elements and strategic materials, which are widely used in steel, alloy, chemical, ceramic, pharmaceutical and other industries. The rational development and full use of domestic vanadium and chromium ore resources can solve the current demand for vanadium and chromium products. Coming dilemma. The properties of vanadium and chromium are similar. In nature, vanadium and chromium usually exist in vanadium-titanium magnetite in a co-existent manner. After vanadium-titanium magnetite is extracted by a converter, vanadium and chromium are enriched in vanadium slag. The leaching solution of the vanadium slag roasting clinker contains high concentrations of vanadium (V(V)) and chromium (Cr(VI...

Claims

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Application Information

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IPC IPC(8): C22B34/32C22B34/22
CPCC22B34/22C22B34/32Y02P10/20
Inventor 李鸿乂杨阳张梦谢兵
Owner CHONGQING UNIV
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