Method for leaching vanadium slag in converter by electro-catalytic oxidation

A technology of electrocatalytic oxidation and converter vanadium slag, applied in electrodes, electrolytic components, electrolytic process, etc., can solve the problems of low vanadium extraction rate, low vanadium pentoxide yield, low vanadium oxysulfate leaching rate, etc. The process conditions are pollution-free, the recovery rate is high, and the process conditions are mild.

Inactive Publication Date: 2011-07-27
CHONGQING UNIV
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Problems solved by technology

However, the existing direct acid leaching method has the disadvantage that the yield of vanadium pentoxide is not high, that is, the extraction rate of vanadium is low.
The key that causes this deficiency is that in its second step, the vanadyl sulfate leaching rate is low

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  • Method for leaching vanadium slag in converter by electro-catalytic oxidation
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  • Method for leaching vanadium slag in converter by electro-catalytic oxidation

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Embodiment Construction

[0010] The method for leaching converter vanadium slag by electrocatalytic oxidation comprises the step (1) of mixing sulfuric acid and converter vanadium slag to prepare ore slurry. In the step (1) of the present invention, the percentage concentration of sulfuric acid is 30% to 50%, and the converter vanadium slag is in the form of powder after passing through a 200 mesh (0.075mm) sieve; the mass ratio of sulfuric acid to the vanadium contained in the converter vanadium slag is is 80:1.5~2; the following steps are:

[0011] (2) Put the ore slurry obtained in step (1) in the leaching tank, and turn on the power to carry out the electrocatalytic oxidation reaction; wherein, the anode current density is 400-1000A / m 2 , the leaching temperature is 25-100°C, and the leaching time is 2-10h (those skilled in the art know that the length of the leaching time is related to the size of the anode current density and the leaching temperature. When the temperature is higher, the leachin...

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Abstract

The method discloses a method for leaching vanadium slag in a converter by electro-catalytic oxidation. In the method, the vanadium slag in the converter is mixed with MnSO4 and H2SO4 to obtain slurry and then leaching is conducted by non-membrane electro-catalytic oxidation; and after the leached ore slurry is filtered and separated, the vanadium in the obtained leaching solution is extracted through conventional ammonium salt (ammonium sulfate) vanadium precipitation so as to prepare vanadium pentoxide. During the leaching, the low-valent vanadium which is not easily leached in the vanadium slag is oxidized into high-valent vanadium which is easily leached by an anode-generated strong oxidant Mn3+ so that the leaching rate of the vanadium is improved by using an electro-catalytic oxidation method to leaching the vanadium slag, therefore, the problems of high energy consumption and high pollution in the traditional leaching methods are avoided, otherwise, the method is also suitable for the extraction of the vanadium in the raw materials including vanadium and the selective leaching of molybdenite concentrate; meanwhile, the method has the characteristics of being good in selectivity, moderate in technological condition, free of pollution and the like, therefore, a novel environmentally friendly wet decomposition method is provided.

Description

technical field [0001] The invention relates to a method for leaching vanadium with converter vanadium slag. Background technique [0002] Vanadium (V) is an important industrial raw material, and vanadium pentoxide (V 2 o 5 ) can not only obtain the oxide of vanadium available in industry, but also can conveniently reduce vanadium. There are several methods for leaching converter vanadium slag (to produce vanadium pentoxide), among which the full wet vanadium extraction has less pollution. In the full wet method of vanadium extraction, the direct acid leaching method is commonly used, and its specific steps include: ① using sulfuric acid (H 2 SO 4 ) mixed with converter vanadium slag to prepare ore slurry; ②Stir and stand to leach vanadyl sulfate (VOSO 4 ); ③ filter; ④ add ammonium sulfate [(NH 4 ) 2 SO 4 ] (that is, ammonium salt precipitation vanadium method), in order to obtain ammonium polyvanadate (NH 4 VO 3 ) precipitate; ⑤ filter and wash the precipitate to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B7/00C25B1/00C25B11/08C22B34/22
CPCY02P10/20
Inventor 刘作华李艳刘仁龙陶长元杜军周小霞范兴孙大贵左赵宏宁伟征牟天明丁莉峰彭迪武凯
Owner CHONGQING UNIV
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