Method for separating and recycling vanadium and chromium from vanadate-chromate-containing solution

A vanadium-containing chromate, separation and recovery technology, applied in the field of separation and recovery of vanadium-chromate solution containing vanadium chromate, can solve the problems of difficult control of process conditions, high cost, incomplete separation, etc.

Inactive Publication Date: 2012-09-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation of vanadium and chromium in the solution can also be achieved by extraction with quaternary amine or primary-secondary compound amine, but the cost of extraction and separation of vanadium and chromium is high, and the process conditions are difficult to control
Chinese patent CN101538652B uses macroporous strong basic resin D201 to separate vanadium and chromium in the green mud leach solution, but the separation of vanadium and chromium is not complete, the process is complicated, and the production cost is high
The whole process requires both oxidative vanadium-containing chromate solution and reductive vanadium-containing chromate solution. The process is long and the operation is complicated, and only qualified products of vanadium can be recovered, and chromium is still obtained in the form of chromium slag. Form recovery, the efficiency of separation and recovery of vanadium and chromium is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 10L vanadium slag containing V 0.4g / L, Cr 2.5g / L, pH value 1.5 to form vanadium precipitation solution, first add sodium hydroxide to adjust the pH value to 2.5, and then use weak base resin D301 to preferentially adsorb Vanadium in the solution after vanadium precipitation, until the concentration of vanadium in the effluent is equal to the concentration of vanadium in the feed solution, the contact time for vanadium adsorption is 30min, and the V in the effluent is 0.02g / L as the breakthrough point for resin adsorption of vanadium . Use weak base anion resin D315 to adsorb chromium in the effluent before the leakage point, and the contact time for chromium adsorption is 45 minutes. The solution that flows out after crossing the dew point returns to the vanadium adsorption process to completely adsorb the vanadium therein. The negative vanadium resin is desorbed with 3.0mol / L NaOH solution, the contact time of vanadium desorption is 45min, the desorption solution...

Embodiment 2

[0030] The leaching solution containing V 4.1g / L and Cr 1.5g / L obtained by extracting vanadium from 15L vanadium slag for the second time, firstly add sulfuric acid to adjust the pH value to 3.0, then use strong base resin D211 to preferentially adsorb and leach the chromium in it until the chromium in the effluent The concentration of chromium is equal to the concentration of chromium in the feed solution, the chromium adsorption contact time is 60min, and the effluent contains 0.03g / L of Cr as the breakthrough point of resin adsorption chromium. The effluent before the leakage point is adsorbed with strong base anion resin D231 to absorb vanadium, and the contact time for vanadium adsorption is 30min. The solution flowing out after the dew point is returned to the chromium adsorption process to completely adsorb the chromium therein. Negative chromium resin is desorbed with 2mol / L NaOH solution, and the contact time of chromium desorption is 80min. Add sodium thiosulfate to ...

Embodiment 3

[0032] 5L high chromium vanadium slag is obtained after sodium roasting-water immersion containing V 12.3g / L, Cr 8.2g / L solution, first add magnesium chloride to the solution to purify and remove impurities, add sulfuric acid to adjust the pH value to 3.5, and then Use strong base anion resin D204 to preferentially adsorb and leach the chromium until the concentration of chromium in the effluent is equal to that in the feed liquid, the chromium adsorption contact time is 60min, and the chromium in the effluent contains 0.05g / L as the resin adsorption Chromium leak point. Add sulfuric acid to the outflowing solution before the leakage point to adjust the pH value to 1.8, then add ammonium sulfate to precipitate ammonium polyvanadate according to 1.2 times the stoichiometric amount required for vanadium precipitation, and ammonium polyvanadate is calcined at 500°C for 3 hours to obtain a purity of 98.8%. Vanadium pentoxide products. The solution flowing out after the dew point ...

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Abstract

The invention relates to a method for separating and recycling vanadium and chromium from a vanadate-chromate-containing solution, which is characterized in that by using the difference of between anion exchange potentials formed by hexavalent chromium and quintavalent vanadium in water solutions by weak alkali and strong alkali anion exchange resins, saturation adsorption is utilized to implement deep separation of vanadium and chromium, thereby obtaining the vanadium and chromium products. The invention has the characteristics of short technological process, favorable separating effect, environment friendliness and the like, and is simple to operate. The invention can effectively shorten the technological process for separating and recycling vanadium and chromium from the vanadate-chromate-containing solution, enhance the separating effect of vanadium and chromium, lower the recycling cost of vanadium and chromium, and save the reagent consumption; and vanadium and chromium in the solution are deeply separated through ion exchange and are respectively recycled. The invention is suitable for industrialized application.

Description

technical field [0001] The invention relates to a method for separating and recovering vanadium chromate from a vanadium-containing chromate solution. Background technique [0002] Vanadium and chromium are adjacent transition elements in the same period and have similar properties. In nature, vanadium and chromium usually exist in minerals in a symbiotic manner. The vanadium-titanium magnetite mined in my country's Panzhihua, Xichang, Chengde and other regions is a typical representative of this type of mine. The vanadium slag produced in the vanadium titanomagnetite ironmaking process will produce a large amount of vanadium precipitation mother liquor containing vanadium chromate in the production process of vanadium extraction. In addition, waste liquid containing vanadium chromate will also be produced in chemical industry, electroplating and other metallurgical industries. [0003] Both vanadium and chromium are valuable metals, and both are heavy metal elements harmf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B34/22C22B34/32
CPCY02P10/20
Inventor 王明玉王学文樊烨烨
Owner CENT SOUTH UNIV
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