| Summary: | 碩士 === 國立成功大學 === 環境工程學系 === 88 === Stabilization of Copper and Zinc ions with n-Butyl Xanthate
Graduate Student：Jyh-Jye Huang Adviser：Juu-En Chang
Department of Environmental Engineering
National Cheng Kung University
ABSTRACT
The surfactant, potassium n-butyl xanthate (KBuX), was used to treat cupric ions bearing and zinc ions bearing wastewater in this work. Three precipitates, Cu-BuX Zn-BuX and (Cu+Zn) complexes, were formed from the xanthate processes. The purposes of this research were to evaluate the effectiveness of KBuX for metal ion removal and the stabilizing characteristics of the formed precipitates. The stabilizing characteristics of precipitates were examined by using semi-dynamic leaching test (SDLT) with 1N HAc, 1N NaOH, 15% H2O2 and 40% Na2S2O3. And X-ray powder diffraction (XRD) measurements, elemental analyses (EA) measurements, Fourier transform infrared spectroscopy(FTIR) and UV-visible spectroscopic methods were used for behavior illustrations.
The performance of xanthate process showed that it is capable of meeting EPA discharge limits of Taiwan (Cu:3 mg/L; Zn:5 mg/L) when excess KBuX was used. The stabilizing characteristics of three complexes through SDLTwere summarized as follow. Results of UV-vis spectra indicated that the dominating leaching species were free xanthate ion (BuX)-, CS2, and unknown species in acid, alkaline, oxidation and reduction solutions. The investigation on M-BuX complexes by EA, FTIR and XRD showed that the stabilization phase of M-BuX complexes were M-BuX, CuO, ZnS and unknown species. It could be concluded that Cu-BuX complex was the most stable complex in all three metal xanthate complexes when acid, alkaline, oxidation and reduction solutions were used. Zn-BuX complex was stable in alkaline and reduction solutions only, and so was (Cu+Zn)-BuX complex.
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