Method for purifying and enriching low-concentration vanadium-containing water solution

Abstract

The invention relates to a method for purifying and enriching a low concentration water solution with vanadium content. The technical proposal is as follows: a purifying agent with the concentration ranging from 0.6 to 10g / L is added into the low concentration water solution containing vanadium with the concentration of V2O5 of ranging from 2000 to 5000mg / L, the mixture is mixed evenly with a pH value ranging from 6 to 8; the low concentration water solution containing vanadium performs the ion exchange adsorption through the strongly basic anion ion exchange resin at a speed of 2.0 to 10mLh<-1>mL<-1> wet resin to the adsorption and saturation of the strongly basic anion ion exchange resin to obtain the resin containing vanadium and the adsorption under liquid; and then the mixing solution of 3 to 5wt percent of sodium hydroxide and 8 to 13wt percent of sodium chloride is prepared to be as a strippant, the use level of the strippant is three to five times of the volume of the resin containing vanadium, the strippant performs the desorption through the resin containing vanadium at a speed of 0.8 to 1.6 mLh<-1>mL<-1> wet resin to obtain the vanadium enriching fluid; finally, the purifying agent with the concentration ranging from 0.1 to 2.5g / L is added into the vanadium enriching fluid, the purified fluid is obtained after the solid-fluid separation. The method has the characteristics that the purifying time is shortened, the purifying agent consumption is reduced, the vanadium loss is reduced, the purifying effect is good and the technique is simple.

Description

technical field [0001] The invention belongs to the technical field of purification and enrichment of vanadium-containing aqueous solution. In particular, it relates to a method for purifying and enriching low-concentration vanadium-containing aqueous solution. Background technique [0002] The vanadium grade of most vanadium-containing raw materials is relatively low, and the wet vanadium extraction process is mainly used at home and abroad. Due to the differences in vanadium-containing raw materials and overall process requirements, water leaching still plays an important role in the wet vanadium extraction process. [0003] Because the vanadium grade of the vanadium-containing raw material is usually low, the concentration of vanadium in the vanadium-containing solution obtained by leaching is also low, and the content of impurities such as other metal ions in the solution is relatively high. If the vanadium precipitation operation is directly carried out, the obtained V...

AI Technical Summary

Problems solved by technology

The vanadium-containing aqueous solution can be purified and enriched by using a strong basic anion exchange resin, but during the operation process, Si, P, As, Mn, Al and other impurities in the vanadium-containing aqueous solution are also relatively enriched, which affects the products of the vanadium precipitation operation Quality, resulting in unstable vanadium deposition rate

A small number of relatively advanced enterprises and scientific research institutes in China use precipitation to remove impurities before ion exchange for vanadium-containing aqueous solutions (Xu Hongbo, Luo Yunli, Huo Jiankui. Research on phosphorus removal from vanadium leachate, Sichuan Nonferrous Metals, 2002 (3): 29), However, this method uses a large amount of chemicals (usually calcium chloride or calcium oxide), and the loss of vanadium is large. Moreover, a large amount of mud cannot be processed on time, and qualified liquid cannot be sent to the next process in time, which affects the continuity of production.

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