Method for preparing vanadium pentoxide by utilizing invalid vanadium battery positive pole electrolyte
A cathode electrolyte, vanadium pentoxide technology, applied in the field of vanadium batteries, can solve the problems of unusability, precipitation, and the valence mismatch of vanadium ions, and achieve the effect of recycling and reuse and high purity
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preparation example Construction
[0018] (3) Preparation of vanadium pentoxide: filter the solid-liquid mixture (mixed solution containing pentavalent vanadium precipitate) obtained in step (2), dry and grind the filter cake to obtain vanadium pentoxide powder.
[0019] In order to better understand the above exemplary embodiments of the present invention, it will be further described below in conjunction with specific examples.
[0020] Charge and pre-oxidize the exhausted electrolyte of the positive electrode of the vanadium battery to prepare 10L pentavalent electrolyte (1 # Electrolyte) for later use, and the electrolyte needs to be stored at low temperature.
example 1
[0022] Measure 500ml 1 # The electrolytic solution was evaporated and concentrated on an electric furnace and continuously stirred until the volume of the solution was 270ml; the resulting solution was removed and allowed to stand for 24 hours, then filtered and dried to obtain 43.69g of filter cake, and the calculated vanadium yield was 60.01%. Cake grinding to obtain vanadium pentoxide powder.
example 2
[0024] Measure 1000ml 1 # The electrolytic solution was evaporated and concentrated on an electric furnace and continuously stirred until the volume of the solution was 530ml; the resulting solution was removed and allowed to stand for 48 hours, then filtered and dried to obtain a filter cake of 94.82g, and the calculated vanadium yield was 65.12%. Grinding to obtain vanadium pentoxide powder.
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