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Method used for directly precipitating vanadium from acid multi-impurity vanadium-containing solution
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A multi-impurity and solution technology, applied in the direction of improving process efficiency, can solve the problems of low purity of vanadium pentoxide products, long purification process flow, long process flow, etc., to achieve complete crystal form, less impurity content, and process The effect of short process
Active Publication Date: 2017-01-11
WUHAN UNIV OF SCI & TECH
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After the second stage of vanadium precipitation, it undergoes alkali dissolution-adjustment of pH value with sulfuric acid-ammonium salt precipitation of vanadium, and the purification treatment process is long
[0007
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Embodiment 1
[0026] The invention relates to a method for directly precipitating vanadium from an acidic vanadium-containing solution with many impurities. The concrete steps of the method described in this embodiment are:
[0027] Step 1. Oxidation
[0028] Add the oxidizing agent into the vanadium-containing solution and oxidize it at 40-50°C for 0.2-0.6h to obtain the oxidized vanadium solution; 1.0~1.5 times the theoretical molar amount of the oxidizing agent.
[0029] Step 2, Homogeneous Precipitation of Vanadium
[0030] According to urea: the mass ratio of vanadium pentoxide in the oxidized vanadium solution is (12~20): 1, the urea is added to the oxidized vanadium solution, and stirred at 70~90°C for 1.0~4.0 h, solid-liquid separation, that is, ammonium polyvanadate and vanadium precipitation mother liquor.
[0031] Step three, calcining
[0032] The ammonium polyvanadate is calcined at 450-550° C. for 0.5-2.0 hours to prepare vanadium pentoxide.
[0033] The oxidizing agent ...
Embodiment 2
[0035] The invention relates to a method for directly precipitating vanadium from an acidic vanadium-containing solution with many impurities. Present embodiment is except that described oxidizing agent is the mixture of hydrogen peroxide and sodium chlorate, all the other are with embodiment 1.
Embodiment 3
[0037] The invention relates to a method for directly precipitating vanadium from an acidic vanadium-containing solution with many impurities. The concrete steps of the method described in this embodiment are:
[0038] Step 1. Oxidation
[0039] Add the oxidizing agent into the vanadium-containing solution and oxidize it at 50-60°C for 0.4-0.8h to obtain the oxidized vanadium solution; 1.5~2 times the theoretical molar amount of the oxidizing agent.
[0040] Step 2, Homogeneous Precipitation of Vanadium
[0041] According to urea: the mass ratio of vanadium pentoxide in the oxidized vanadium solution is (8~15): 1, the urea is added to the oxidized vanadium solution, and stirred at 75~95°C for 2~5h , Solid-liquid separation, that is, ammonium polyvanadate and vanadium precipitation mother liquor.
[0042] Step three, calcining
[0043] Calcining the ammonium polyvanadate at 500-600° C. for 1.5-2.5 hours to prepare vanadium pentoxide.
[0044] The oxidizing agent is sodium...
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Abstract
The invention relates to a method used for directly precipitating vanadium from an acid multi-impurity vanadium-containing solution. According to the technical scheme, the method includes the steps that an oxidizing agent is added into the vanadium-containing solution at first, oxidation is performed, and accordingly an oxidized vanadium solution is obtained; the addition amount of the oxidizing agent accounts for 1.0-2.5 times of the theoretical molar weight of an oxidizing agent required when low valent vanadium in the vanadium-containing solution is completely oxidized into pentavalent vanadium; then urea is added into the oxidized vanadium solution to be stirred according to the mass ratio of the urea to vanadium pentoxide in the oxidized vanadium solution being (3-20):1, solid-liquid separation is performed, and accordingly ammonium polyvanadate and vanadium precipitation mother liquor can be obtained; and afterwards, the ammonium polyvanadate is calcined for 0.5-3.0h at the temperature condition of 450-650 DEG C, and accordingly the vanadium pentoxide can be obtained. According to the chemical composition of the vanadium-containing solution, the vanadium concentration is larger than 6g/L, the aluminum concentration is smaller than 20g/L, the ferrum concentration is smaller than 1.0g/L, the sodium concentration is smaller than 30g/L, the potassium concentration is smaller than 2.0g/L, and the calcium concentration is smaller than 1.0g/L. The pH value of the vanadium-containing solution is smaller than 0.5. The method has the advantages that the technological process is short, the vanadium precipitating rate is high and the purity of the vanadium pentoxide product is also high.
Description
technical field [0001] The invention belongs to the technical field of vanadium precipitation in a solution containing vanadium. In particular, it relates to a method for directly precipitating vanadium from an acidic vanadium-containing solution with many impurities. Background technique [0002] Precipitation of vanadium from vanadium-containing solution is a process of separating vanadium from impurity elements by means of precipitation and solid-liquid separation to obtain relatively pure vanadium-containing products. The main chemical precipitation methods of vanadium include hydrolysis vanadium precipitation, iron salt vanadium precipitation, calcium salt vanadium precipitation and ammonium salt vanadium precipitation: ammonium salt vanadium precipitation is divided into weakly basic ammonium salt vanadium precipitation, weak acid ammonium salt vanadium precipitation and acidic ammonium vanadium precipitation Salt vanadium precipitation; hydrolysis vanadium precipitat...
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