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A method for direct vanadium precipitation from acidic multi-impurity vanadium-containing solution
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A multi-impurity, solution technology, applied in the direction of improving process efficiency, can solve the problems of low purity of vanadium pentoxide products, long purification treatment process flow, long process flow, etc., to achieve complete crystal form, less impurity content, process short process effect
Active Publication Date: 2018-06-19
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] In summary, the existing vanadium-containing solution vanadium precipitation technology mainly has the disadvantages of long process flow, low vanadium deposition rate and low purity of vanadium pentoxide products.
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Embodiment 1
[0026] A method for direct vanadium precipitation from an acidic multi-impurity vanadium-containing solution. The specific steps of the method described in this embodiment are:
[0027] Step 1. Oxidation
[0028] The oxidant is added to the vanadium-containing solution, and oxidized at 40-50° C. for 0.2-0.6 h to obtain an oxidized vanadium solution; the added amount of the oxidant is required for all the low-valent vanadium in the vanadium-containing solution to be oxidized to pentavalent vanadium. 1.0 to 1.5 times the theoretical molar amount of the oxidant.
[0029] Step 2, Homogeneous Precipitation of Vanadium
[0030] According to urea: the mass ratio of vanadium pentoxide in the vanadium solution after oxidation is (12~20): 1, adding the urea into the vanadium solution after the oxidation, stirring 1.0~4.0 h, solid-liquid separation, namely ammonium polyvanadate and precipitation vanadium mother liquor.
[0031] Step 3. Calcination
[0032] The ammonium polyvanadate ...
Embodiment 2
[0035] A method for direct vanadium precipitation from an acidic multi-impurity vanadium-containing solution. This example is the same as Example 1 except that the oxidant is a mixture of hydrogen peroxide and sodium chlorate.
Embodiment 3
[0037] A method for direct vanadium precipitation from an acidic multi-impurity vanadium-containing solution. The specific steps of the method described in this embodiment are:
[0038] Step 1. Oxidation
[0039] The oxidant is added to the vanadium-containing solution, and oxidized at 50-60° C. for 0.4-0.8 h to obtain an oxidized vanadium solution; the amount of the oxidant added is required for all the low-valent vanadium in the vanadium-containing solution to be oxidized to pentavalent vanadium. 1.5 to 2 times the theoretical molar amount of the oxidant.
[0040] Step 2, Homogeneous Precipitation of Vanadium
[0041] According to urea: the mass ratio of vanadium pentoxide in the vanadium solution after oxidation is (8 ~ 15): 1, the urea is added into the vanadium solution after oxidation, and stirring at 75 ~ 95 ℃ for 2 ~ 5h , solid-liquid separation, namely ammonium polyvanadate and precipitation vanadium mother liquor.
[0042] Step 3. Calcination
[0043] The ammoni...
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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 from a vanadium-containing solution. Specifically, it relates to a method for directly precipitating vanadium from an acidic multi-impurity vanadium-containing solution. Background technique [0002] Precipitation of vanadium from vanadium-containing solution is a process of separating vanadium and impurity elements by means of precipitation and solid-liquid separation to obtain purer vanadium-containing products. The main chemical precipitation methods of vanadium are hydrolysis of vanadium, iron salt, calcium salt and ammonium salt: ammonium salt is divided into weakly basic ammonium salt, weakly acidic ammonium salt and acidic ammonium. Vanadium precipitation by salt; Vanadium precipitation by hydrolysis is to adjust the pH value of the purified vanadic acid or sodium vanadate solution to 1.5~3.0, and precipitate a mixture of polyvanadic acid and sodium polyvanadate under the co...
Claims
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Application Information
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