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| Preparation of Zinc Sulfide from Waste Zinc-bearing Catalyst by Alkaline Leaching |
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Received:September 02, 2011
Revised:September 02, 2011
Accepted:September 05, 2011
Published Online:December 30, 2011
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| DOI：doi：10.3969/j.issn.1007-7545.2012.01.012 |
| KeyWord:waste catalyst containing zinc; alkaline leaching; purification; zinc sulfide |
| Author | Institution |
| HU Hui-ping, XIE Li-fang, CHEN Qi-yuan, WANG Shu-bin |
中南大学 化学化工学院，长沙 |
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| Abstract: |
| A new process for preparing zinc sulfide from waste catalyst containing zinc by alkaline-leaching, purification, precipitation process was studied. The influences of extraction temperature, NaOH concentration, liquid-solid ratio (mass ratio) and extraction time on zinc leaching rate were emphatically investigated. The recovery of Zn was up to 90% under the optimum conditions including concentration of NaOH of 5 mol/L, liquid-solid ratio of 25:1 and leaching at 80 ℃ for 2 hours. Zinc sulfide with high purity and better crystallinity was synthesized successfully by hydrothermal method after leaching solution’s one-stage purification with zinc dust, and the filtrate can be recycled to be used as leaching agent. |
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