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An innovative technology for recovery of zinc, lead and silver from zinc leaching residue

Zheng Y.-X., Lv J.-F., Liu W., Qin W.-Q., Wen S.-M.

Physicochemical Problems of Mineral Processing

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2016

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Vol. 52, iss. 2

943--954

EN

Zinc leaching residue is a good source of zinc and has a great potential to be utilized. However, it is very difficult to recover lead, zinc and silver from the residue by traditional technologies. In this study, a new technology based on conversions of PbSO4 and ZnSO4 in the residue to their respective sulfides by reduction roasting with coal powder followed by a flotation treatment was developed. The effects of roasting temperature, coal dosage, reaction time and pyrite dosage were investigated at a laboratory scale. The results showed that the conversion extent of PbSO4 and ZnSO4 under the optimal experimental conditions was 71.89 and 69.76%, respectively. A flotation concentrate containing 39.13% Zn, 6.93% Pb and 973.54 g/Mg Ag was obtained from the treated material, and the recovery of Zn, Pb and Ag was 48.38, 68.23 and 77.41%, respectively. The tailing containing ZnFe2O4 or Fe3O4 could be either stockpiled or further disposed.

2

Selective reduction of PbSO4 to PbS with carbon and flotation treatment of synthetic galena

Zheng Y.-X., Liu W., Qin W.-Q., Han J.-W., Yang K., Luo H.-L.

Physicochemical Problems of Mineral Processing

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2015

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Vol. 51, iss. 2

535--546

EN

In order to recover lead from the zinc leaching residues, a new technology involving selective reduction of lead sulfate to lead sulfide with carbon followed by flotation was investigated. The reduction thermodynamics of PbSO4 was discussed and the effects of molar ratio of C to PbSO4, reaction temperature and time were examined by thermogravimetry (TG) and XRD. Verification tests were further carried out to prove the conclusions of thermodynamic and TG analyses, and the transformation extent could reach 86.45% under the optimal roasting conditions. The prepared galena was then subjected to micro-flotation tests, and the highest lead recovery could reach up to 75.32%.

3

Application of ICP-OES for monitoring of PbSO4 content in plates used in production of lead-acid batteries

Szypuła M., Bobrowski A.

Chemia Analityczna

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2009

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Vol. 54, No. 5

989-995

EN

A rapid, accurate, and precise ICP-OES procedure for determination of lead sulfate in lead-acid batteries plates was elaborated based on the measurement of the sulfur emission line. Optimal parameters of spectrometric measurements were selected and accuracy, repeatability, and reproducibility were estimated. The proposed analytical ICP-OES procedure was validated through the analysis of certified reference materials, and a good agreement between the ICP-OES results and the reference values was obtained. It was proved that the ICP-OES method is more accurate and precise than the routine gravimetric method. Additional advantages of the elaborated method over the routine one are high speed of total analysis and elimination of toxic barium chloride.

PL

Opracowano szybką i dokładną procedurę oznaczania zawartości siarczanu ołowiu w masach czynnych płyt akumulatorowych techniką ICP-OES. Dobrano optymalne warunki pracy spektrometru oraz wyznaczono dokładność, powtarzalność i odtwarzalność metody. Wiarygodność uzyskanych wyników potwierdzono analizując certyfikowane materiały referencyjne oraz porównując z wynikami otrzymanymi za pomocą normowej metody wagowej. Z przeprowadzonej walidacji wynika, że opracowana metoda charakteryzuje się większą dokładnością) precyzją niż dotychczas rutynowo stosowana metoda wagowa. Dodatkowymi zaletami metody, w porównaniu do wagowej metody wytrącania BaSO4, sąznacznie szybszy czas analizy i eliminacja szkodliwego dla zdrowia BaCl2.