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Preparation of Calcium Stannate from Lead Refining Dross by Roast–Leach–Precipitation Process

1
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
2
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(5), 283; https://doi.org/10.3390/min9050283
Received: 22 March 2019 / Revised: 7 May 2019 / Accepted: 7 May 2019 / Published: 9 May 2019
PDF [2363 KB, uploaded 9 May 2019]

Abstract

Lead refining dross containing plenty of tin and other heavy metals, such as lead and antimony, is considered a hazardous waste generated in large quantities in lead smelter plants. In this study, calcium stannate was synthesized from lead refining dross using sodium carbonate roasting and alkaline leaching followed by precipitation with CaO. The effect of roasting and leaching parameters on the extraction efficiency of tin was investigated. The leaching efficiency of tin reached 94% under the optimized conditions: roasting with 60% Na2CO3 at 1000 °C for 45 min, and leaching using 2 mol/L NaOH solution for 90 min at 85 °C and 8 cm3/g liquid/solid ratio. Furthermore, more than 99% of tin in the leaching solution was precipitated using CaO. Finally, XRD, SEM, and ICP-OES analyses indicated that the final CaSnO3 product had a purity of 95.75% and its average grain size was smaller than 5 μm. The results indicated that the developed method is feasible to produce calcium stannate from lead refining dross.
Keywords: alkaline leaching; secondary resources; hazardous waste reduction; smelting wastes; sodium roasting alkaline leaching; secondary resources; hazardous waste reduction; smelting wastes; sodium roasting
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, D.; Han, J.; Liu, W.; Jiao, F.; Qin, W. Preparation of Calcium Stannate from Lead Refining Dross by Roast–Leach–Precipitation Process. Minerals 2019, 9, 283.

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