Method for preparing NaV2O5 from vanadium-enriched liquid obtained by extracting vanadium from shale

Abstract

The invention discloses a method for preparing NaV2O5 from vanadium-enriched liquid obtained by extracting vanadium from shale. The method comprises the steps that 1, vanadium shale pickle liquor is reacted through an extraction-back extraction technology to obtain the vanadium-enriched liquid; 2, a reducing agent is dissolved in the vanadium-enriched liquid according to the molar ratio of the reducing agent to vanadium in the vanadium-enriched liquid of 0.25-3.0, acid liquor or alkaline liquor is used for adjusting the solution pH value to be 2.0-7.0, and a to-be-reacted solution is obtained;3, the to-be-reacted solution obtained in step 2 is reacted at 180-230 DEG C for 5-8 hours, and after natural cooling, slurry is obtained; 4, the slurry obtained in step 3 is subjected to solid-liquid separation to obtain solid and liquid, and the solid is subjected to vacuum drying at 60-100 DEG C to obtain the NaV2O5. The method has the advantages of being environmentally friendly, pollution-free, safe, simple in technology, short in preparation time, low in energy consumption and the like.

Description

technical field [0001] The invention relates to the technical field of preparing non-ferrous metal smelting, in particular to a vanadium-rich liquid for extracting vanadium from shale to prepare NaV 2 o 5 Methods. Background technique [0002] NaV 2 o 5 It is a layered structure vanadate, Na ion is located in V 2 o 5 Between the layers, it has good charge-discharge cycle stability, and can be used as the positive electrode material of lithium batteries, and can also be used as the positive electrode material of sodium batteries. Therefore, NaV 2 o 5 It is a very promising electrochemical material. As a successor to GeCuO 3 The second inorganic spin Pels material after that. NaV 2 o 5 The bandgap from the spin-single-crystal ground state to the first excited state is very small, which makes it also of great significance in quantum switches. [0003] Now reported NaV 2 o 5 There are two kinds of preparation methods: solid phase sintering method and hydrothermal s...

AI Technical Summary

Problems solved by technology

This method takes a long time to synthesize, has low conversion efficiency and poor reproducibility

Chinese patent 201610662118.X discloses a NaV 2 o 5 The preparation method of the method is to dissolve vanadium pentoxide in sodium hydroxide solution, then reduce it with hydrogen, and obtain NaV by hydrothermal reaction. 2 o 5 , this patent uses hydrogen as the reducing agent, although it is clean and non-polluting, but using gas as the reducing agent, the instrument needs excellent airtightness, and there is a risk of explosion

On the one hand, from vanadium-rich liquid to process vanadium products, and then to NaV 2 o 5 , which increases the process flow and corresponding energy consumption; on the other hand, when preparing ammonium vanadate salt and ammonium polyvanadate, excessive ammonium is added to produce a large amount of ammonia nitrogen wastewater, which is prepared by pyrolysis of ammonium vanadate salt and ammonium polyvanadate When vanadium pentoxide is used, a large amount of nitrogen-containing waste gas is produced, and ammonia nitrogen waste water and waste gas cause serious environmental pollution

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