Method for recycling tungsten ions from scheelite waste mineral processing wastewater

Abstract

The invention discloses a method for recycling tungsten ions from scheelite waste mineral processing wastewater. The method includes the following steps of firstly, adding an acetic acid-sodium acetate buffer solution with the pH value of 3.5 to chelate resin containing O and N heterocyclic rings, and conducting soaking till the chelate resin containing the O and N heterocyclic rings are fully dissolved and expanded; secondly, adding the substance obtained in the first step to the obtained scheelite waste mineral processing wastewater after the scheelite waste mineral processing wastewater naturally deposits, and conducting constant-temperature oscillation under the conditions of the temperature of 288 K to 308 K and the rotating speed of 100 r / min; thirdly, measuring the tungsten ion saturated adsorption capacity of the chelate resin containing the O and N heterocyclic rings after adsorption is balanced; fourthly, washing the chelate resin where adsorption is balanced and O and N heterocyclic rings are contained through the acetic acid-sodium acetate buffer solution with the pH value of 3.5, conducting washing through deionized water multiple times, soaking the chelate resin in a NaOH solution with the mass concentration of 2% to be subjected to oscillation and desorption, and conducting evaporation, concentration and crystallization on the desorbed solution to obtain a tungstic acid finished product. The method has the advantages of being high in tungsten ion selectivity, good in adsorption performance, capable of being recycled, and the like.

Description

technical field [0001] The invention relates to a heavy metal adsorption technology, in particular to a method for enrichment and selective adsorption of tungsten ions in scheelite mineral processing wastewater with high adsorption capacity, high elution rate and high selectivity. Background technique [0002] There are many methods for separation and enrichment of heavy metals in water, such as: solvent extraction, membrane separation, chemical precipitation, ion exchange resin, chelation adsorption material enrichment and so on. Wherein the operation process of the solvent extraction method is very complicated, and the organic solvent used for extraction has the disadvantages of being volatile, toxic and high in cost, which limits the practical application of this extraction method; the cost of the membrane separation method is relatively high. High; chemical precipitation method is more common, but the precipitant used in it is expensive, and the effect is not good when t...

AI Technical Summary

Problems solved by technology

[0004] Scheelite mineral processing wastewater contains Fe, Cu, As, Pb, Zn and other metal ions, if discharged directly, it will cause huge environmental pollution

At present, although heterocyclic chelating resins containing O and N can adsorb various metal ions by existing methods, the adsorption amount for tungsten ions is small, and the elution rate is low, so the practical value is not high.

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