A kind of vanadium-aluminum separation method of vanadium-containing solution

Abstract

The invention relates to a vanadium-aluminum separation method in a vanadium-containing solution. The technical scheme is: adjust the pH of the vanadium-containing solution to 1.0 to 2.5 with potassium hydroxide, and separate the solid and liquid to obtain the neutralized vanadium solution; according to the potassium ion in the potassium salt: the material ratio of the aluminum ion in the neutralized vanadium solution is (3-8): 1, adding potassium salt into the neutralized vanadium liquid, stirring at 85-95°C to obtain the reacted liquid; crystallizing the reacted liquid at 0-10°C, and separating the solid and liquid to obtain Liquid and coarse crystals after separation of vanadium and aluminum; according to liquid-solid ratio (1~2)m 3 / Kg, add hot water at 90-100°C to the crude crystals, stir until completely dissolved, cool, separate solid and liquid, recrystallize at 0-10°C for 12-24 hours, separate solid-liquid, wash to obtain potassium aluminum oxalate ( K 3 [Al(C 2 o 4 ) 3 ]·3H 2 O). The invention has the characteristics of simple process, good vanadium-aluminum separation effect, low vanadium loss rate and high resource comprehensive utilization rate.

Description

technical field [0001] The invention belongs to the technical field of vanadium-aluminum separation. Specifically, it relates to a vanadium-aluminum separation method in a vanadium-containing solution. Background technique [0002] Vanadium in vanadium-bearing shale usually occurs in mica ore in the form of isotropic substitution of trivalent aluminum in the alumino-dioctahedral structure, with low vanadium grade and high aluminum grade. During the acid leaching process for extracting vanadium from vanadium-bearing shale, the leaching of aluminum is easier than that of vanadium, and a large amount of Al 2 o 3 Al is formed during acid leaching 3+ If it enters the leaching solution, if it is not removed, it will seriously affect the further purification and enrichment of subsequent vanadium and the quality of the final vanadium product. Therefore, it is necessary to separate vanadium and aluminum from vanadium-containing solutions. [0003] Kim et al. (Hong-In Kim, Ki-Woo...

AI Technical Summary

Problems solved by technology

Although the aluminum removal rate of this method reaches 80%, it has the following defects: the consumption of ammonia water is large and the cost is high; excessive ammonia water is easy to react with acid to release ammonia gas, which pollutes the environment; the valuable metal aluminum is not recovered, and the comprehensive utilization rate of resources is low

Although this method has a high recovery rate of aluminum and potassium, its technological process is cumbersome, the reaction time is long, and the loss of vanadium in the crystallization process is relatively high.

[0007] To sum up, for the purification of vanadium-containing solutions, most of them adopt extraction method to separate vanadium and impurity aluminum ions, and there are also a few literatures that use chemical precipitation or crystallization. However, the existing methods for the separation of vanadium and aluminum in vanadium-containing solutions mainly have complex process , High loss rate of vanadium, unrecovered valuable metal aluminum, low comprehensive utilization rate of resources, etc.