AI Article Synopsis
- A new method using ultraviolet-visible spectrometry was developed to analyze insoluble xanthate heavy metal complexes in flotation wastewater, revealing that Pb2+ and Cu2+ create insoluble complexes while other metals like Fe2+, Zn2+, and Mn2+ have minimal impact.
- The study assessed various filter membranes and identified the 0.22 μm membrane as effective for separating copper and lead xanthate from the wastewater.
- Additionally, sodium sulfide was shown to effectively release xanthate ions from these complexes, allowing researchers to quantify the amount of heavy metal complexes based on the increase of free xanthate in the solution, with successful testing at various ore-dressing plants.
Article Abstract
A ultraviolet-visible spectrometry method of determining insoluble xanthate heavy metal complexes in flotation wastewater was the first time to be put forward. In this work, the changes of ultraviolet-visible spectra of xanthate solution after the addition of various heavy metal ions were investigated firstly. It was found that Pb2+ and Cu2+ can form insoluble complexes with xanthate, while Fe2+, Zn2+ and Mn2+ have little effect on the ultraviolet absorption of xanthate solution. Then the removal efficiencies of filter membrane with different pore sizes were compared, and the 0.22 μm membrane was found to be effective to separate copper xanthate or lead xanthate from the filtrate. Furthermore, the results of the study on the reaction of sodium sulfide and insoluble xanthate heavy metal complexes showed that S(2-) can release the xanthate ion quantitatively from insoluble complexes to solution. Based on the above research, it was concluded that the amount of insoluble xanthate heavy metal complexes in water samples can be obtained through the increase of free xanthate in the filtrate after the addition of sodium sulfide. Finally, the feasibility of this method was verified by the application to the analysis of flotation wastewater from three ore-dressing plants in the Thirty-six Coves in Chenzhou.
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