Study on the Performance of Heavy Metals Adsorption and Regeneration of H-type Chelating Resin in Raffinate
In order to recover the valuable metals Ni,Co and Cd in the waste water of cobalt refining raf-finate and make the concentration of heavy metal ions reach the discharge standard,an H-type IDA che-lating resin D854 resin was used to remove the heavy metals in the raffinate after precipitation,and the heavy metal adsorption and regeneration performance were compared with the Na-type D851 resin com-monly used in the existing industry.The results showed that compared with D851 resin,H-type D854 resin had larger adsorption capacity of heavy metals,and the adsorption priority was Ni2+>Co2+>Cd2+.The adsorption capacity of H-type D854 resin is not easily affected by the pH change of the origi-nal solution,and the adsorption effect was stable in the range of pH 4～8.The resin could be effectively eluted by 5BV H2 SO4 with mass fraction of 10%,and the elution order of heavy metals was Cd2+,Co2+and Ni2+.The adsorption capacity of the regenerated H-type D854 resin can still reach more than90%of the first time after three times of reuse,and the removal effect of heavy metals was stable.The H-type D854 resin has a wide pH range,long service life,easy desorption,no alkali transformation,and short regeneration time,which greatly improves the treatment efficiency of raffinate wastewater.
H-type chelating ResinIDAcobalt refining residueadsorptionheavy metal
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