Tungsten desorption method of weakly basic anion exchange resin

Abstract

The invention discloses a tungsten desorption method of weakly basic anion exchange resin, which comprises the following steps: S1, selecting alkali liquor according to the tungsten adsorption capacity of weakly basic anion exchange resin, and calculating the theoretical alkali consumption of tungsten desorption; S2, adding weakly basic anion exchange resin into a tungsten desorption container, and adding the alkali liquor into the tungsten desorption container according to the theoretical alkali consumption; S3, after a first predetermined amount of alkali liquor is added, discharging reactedfeed liquid; S4, continuing to add the alkali liquor, and after a second predetermined amount of alkali liquor is added, discharging the reacted feed liquid and recovering sodium tungstate in the feed liquid; S5, continuing to add the alkali liquor, and after a third predetermined amount of alkali liquor is added, discharging the reacted feed liquid and recovering the alkali liquor in the feed liquid; and S6, continuing to add the alkali liquor until the theoretical consumption of the alkali liquor is reached, and discharging the reacted feed liquid. According to the tungsten desorption method disclosed by the invention, only alkaline hydrolysis is carried out, and a sectional alkaline hydrolysis method is adopted, so that the desorption process can be simplified, the consumption of alkali liquor is effectively saved, the concentration of sodium tungstate is increased, and the consumption of washing water is reduced.

Description

Technical field [0001] The present invention relates to the technical field of tungsten recovery, in particular to a method for removing tungsten from a weakly basic anion exchange resin. Background technique [0002] After the weakly basic anion exchange resin absorbs tungsten, the weakly basic anion exchange resin needs to be treated for tungsten removal. The traditional weakly basic anion exchange resin adsorbs tungsten and then desorbs it by firstly dissolving the adsorbed tungsten into ammonium tungstate directly into the product section material liquid, and then desorbing the tungsten that has not been cleaned in the previous section by alkali, and the obtained sodium tungstate is returned to the regulator. Acid resorption. The process operation is relatively cumbersome; APT (ammonium paratungstate) is easy to precipitate during the ammonia hydrolysis process, which affects the desorption flow; the sodium tungstate obtained in the alkaline hydrolysis section contains ammon...

AI Technical Summary

Problems solved by technology

The operation of the process is cumbersome; APT (ammonium paratungstate) is easily precipitated during the ammonolysis process, which affects the desorption flow rate; sodium tungstate containing ammonia is obtained in the alkaline hydrolysis section, and white precipitates will be precipitated during the acid adjustment process; the desorption cycle is long; impurity elements are difficult to control; the amount of washing water is too large major defect

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