Method for separating and extracting vanadium and chromium from vanadium chromium leaching liquor

A technology of leaching liquid and vanadium chromium, which is applied in the field of hydrometallurgy, can solve the problems of difficult separation and recovery of vanadium chromium again, and achieve the effects of low production cost, small quantity and simple operation

Active Publication Date: 2013-09-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for separating and extracting vanadium chromium in the vanadium chromium leach solution, the purpose is to sol

Method used

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  • Method for separating and extracting vanadium and chromium from vanadium chromium leaching liquor

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Add concentrated sulfuric acid to adjust the pH of 1L of vanadium-chromium leaching solution (V: 8.2g / L, Cr: 3.23g / L) to 0.3, add sodium sulfite under stirring conditions, a reduction reaction occurs, and maintain the pH at the same time as the reaction 0.3, the amount of sodium sulfite added is 80% of the stoichiometric reduction of hexavalent chromium in the leach solution to trivalent chromium;

[0028] After the reaction is finished, adjust the pH to 5.0, a precipitation reaction occurs, maintain the pH of the precipitation reaction at 5.0, and the reaction time is 20min. After the reaction is completed and filtered, the filter residue and the filtrate are obtained. The filter residue is washed with deionized water and dried, and the filtrate is ready for use; The vanadium precipitation rate was detected to be 35.7%, and the chromium precipitation rate was 89.7%. In the filter residue, by weight percentage: V: 24.49%, Cr: 35.3%;

[0029] (2) Calcinate the filter...

Embodiment 2

[0032] (1) Add concentrated hydrochloric acid to adjust the pH of 1L of vanadium-chromium leaching solution (V: 8.2g / L, Cr: 3.23g / L) to 1.5, add sodium sulfite under stirring conditions, a reduction reaction occurs, and maintain the pH at the same time as the reaction 1.5, the amount of sodium sulfite added is 90% of the stoichiometric reduction of hexavalent chromium in the leachate to trivalent chromium;

[0033] After the reaction is over, adjust the pH to 5.2, a precipitation reaction occurs, maintain the pH of the precipitation reaction at 5.2, and the reaction time is 40min. After the reaction is completed and filtered, the filter residue and the filtrate are obtained. The filter residue is washed with deionized water and dried, and the filtrate is ready for use; vanadium The precipitation rate is 16.5%, and the chromium precipitation rate is 96.7%. In the filter residue, by weight percentage: V: 11.63%, Cr: 40.2%;

[0034] (2) Calcinate the filter residue obtained in st...

Embodiment 3

[0037] (1) Add concentrated hydrochloric acid to adjust the pH of 1L of vanadium-chromium leach solution (V: 8.2g / L, Cr: 3.23g / L) to 2.5, add sodium sulfite under stirring conditions, a reduction reaction occurs, and maintain the pH at the same time as the reaction 2.5, the amount of sodium sulfite added is 100% of the stoichiometric reduction of hexavalent chromium in the leachate to trivalent chromium;

[0038] After the reaction is over, adjust the pH to 5.5, a precipitation reaction occurs, maintain the pH of the precipitation reaction at 5.5, and the reaction time is 60min. After the reaction is completed, filter to obtain the filter residue and filtrate. The filter residue is washed with deionized water and dried, and the filtrate is ready for use; vanadium The precipitation rate is 18.5%, the chromium precipitation rate is 92.7%, and in the filter residue by weight percentage: 15.5%, Cr: 38.4%;

[0039] (2) Calcinate the filter residue obtained in step (1) at 1000°C for 1...

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Abstract

The invention belongs to the field of wet metallurgy, and particularly relates to a method for separating and extracting vanadium and chromium from vanadium chromium leaching liquor. The method comprises the following steps of: adding sodium sulfite into the vanadium chromium leaching liquor, adjusting the pH value to 5 to 5.5; carrying out the precipitation reaction; filtering, calcining filtered solids and cooling; adding the calcination products into NaOH (sodium hydroxide) solution to obtain solid filter residue, i.e. chromium sesquioxide; adjusting the pH value of the liquid filtered after the precipitatio to 2.0 to 2.5, heating the filtered liquid to 90 to 95 DEG C, and adding ammonium sulfate to obtain precipitates, filtering the precipitates, wherein the solid filter residue is ammonium metavanadate. By adopting the moderate reduction, less reduction agent is added, the reduction action is carried out under a normal temperature condition, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for separating and extracting vanadium and chromium from a vanadium and chromium leach solution. Background technique [0002] Vanadium-titanium magnetite is mainly composed of iron (Fe), vanadium (V), titanium (Ti) elements, and other useful elements such as cobalt (Co), nickel (Ni), chromium (Cr), scandium (Sc) The vanadium slag produced in the smelting process of multi-element symbiotic iron ore such as gallium (Ga) is currently the main raw material for extracting vanadium in my country. However, due to the high content of chromium in the vanadium slag of high-chromium vanadium-titanium magnetite, after sodium roasting and leaching, due to the similar properties of vanadium and chromium, vanadium and chromium enter and exit the leach solution together, which brings difficulties to the subsequent vanadium extraction process. [0003] Although the roasting pr...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B3/20C22B34/22C22B34/32
CPCY02P10/20
Inventor 薛向欣毛林强杨合刘东李亮历明涛
Owner NORTHEASTERN UNIV
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