MMIJ & EARTH 2017, Sapporo

Presentation information (2017/08/24 Ver.)

Special Session

EARTH

Tue. Sep 26, 2017 1:00 PM - 3:30 PM C310 (Fl.3.,Build. C)

Chairman: Mayumi Ito(Hokkaido University)

1:45 PM - 2:00 PM

[1801-09-04] Recovery of zinc from high iron-bearing zinc calcines by alkaline leaching and precipitation process

○Ning Peng1, Bing Peng1,2, XiaoBo Min1,2, Hui Liu1,2 (1. Central South University, 2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution)

Chairman:Mayumi Ito(Hokkaido University)

Keywords:alkaline leaching, zinc calcines, zinc ferrite, zinc precipitation

A new method to recover zinc from high iron-bearing zinc calcines is developed. Zinc calcines was roasted to decompose zinc ferrite under the atmosphere of CO and CO2, then the roasted product was leached with alkaline solutions, in which zinc was selectively leached and iron was remained in leaching residues. Zinc extraction is as high as 98% after leaching in 5mol/L NaOH at 1oC for 6min. The leachate was purified using Na2S and Pb, Cu was removed as sulfide precipitates. The zinc was recovered from purified zinc pregnant solutions by pH adjustments using spent electrolyte as neutralizers. Nearly 99% of zinc were recovered as zinc hydroxide, and zinc oxide with high purity and good crystal structure was obtained from the zinc hydroxide after roasting at 25oC for 6min.

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