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Study of Vanadium Extraction from High Concentration Sulfate Media

Author: XuLiang
Tutor: LiQingGang
School: Central South University
Course: Metallurgical Engineering
Keywords: stone coal vanadium extraction high acid HBL101
CLC: TF841.3
Type: Master's thesis
Year: 2013
Downloads: 32
Quote: 0
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Abstract


Abstract:Vanadium titanium magnetite and stone coal are two importantt vanadium resourses in China. As technology improves, the vanadium output from stone coal was increased, it was accounted for40%in total vanadium product. Now the main art of extracting vanadium from stone coal was H2SO4leaching—neutralizing—restoring—P204extracting—H2SO4stripping—deoxidizing—vanadium precipitating. As it was needed to neutralize and restore the leaching solution, also deoxidize the stripping solution, production cost was high. In order to save production cost, also the acid in the leaching recycle, we proposed that a novel extractant HBL101was used to extract vanadium directly from high acid leaching solution of stone-coal.Various parameters such as acidity, oxidation potential, contact time, phase ratio, temperature were investigated. The results indicated the vanadium single stage extraction could reach more than98.0%, Al、Fe、 Mg were not extracted with temperature35℃, contacting time10minutes, phase ratio1/1.The results of three-stage counter current extraction with temperature35℃, contacting time10minutes, phase ratio1/2, indicated the vanadium extraction could reach more than99.80%. The loaded organic was stripped by NaOH, after adjusting the pH of the stripping solution, the stripping liquid was directly used to precipitate vanadium with NH4Cl, and the purity of V2O5product was more than98.68%.This paper was also studied the mechanism of vanadium extraction from high acid solution by extractant HBL101. The results of the saturation method, the molar method and the slop method indicated that the reaction equation of oxime extractant extracting vanadium from sulfuric acid solution was:VO2++HL=VO2L+H+. Through the infrared spectrum and single crystal X-ray diffraction observation, the structure of V-HBL101extractant was proposed just as the picture below.In addition, we had studied the stability of HBL101, showing that the ability of extracting vanadium with HBL101was reduced as cycling. We found that the temperature was higher than45℃influnced the stability of HBL101. In high acid condition, little anti oxime of HBL101might happen Backman rearragement reaction, that might produce amides, the amides was easily hydroling and producing short carbon chain of organic amine. Some short carbon chain of organic amine solubled in aqueous, and they might make reaction with the strong oxidizing substances, this might accelerate the degradation of extractant. The aluminum was not influncing the life span of HBL101.This process was a short process to P204extraction, it was avoiding adjusting acidity and reduction, at the same time the raffinate could be returned to leach the sone coal.If the degradation of HBL101was solved, the art of HBL101extraction had industrial using prospects.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Rare metal smelting > Refractory metals smelting ( high - temperature molten metal ) > Vanadium
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