| 第 40 卷第 3 期 |  | Vol. 40 No. 3 | | 2010 年 6 月 | Jun 2010 |
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所属栏目：功能材料
低品位氧化锌矿氨-碳酸氢铵浸出制备氧化锌工艺的研究 |
| 蒋崇文，罗 艺*，钟 宏
（中南大学 化学化工学院，湖南 长沙 410083） |
| 摘 要：采用氨-碳酸氢铵溶液从低品位氧化锌矿中浸出制备氧化锌。研究结果表明，在氨水浓度7 mol／L、碳酸氢铵浓度0.62 mol／L、浸出温度50℃、氧化锌矿粉粒度为177 μm、液固比5∶1、浸出时间3 h的条件下，锌一段浸出率为87.2 %，经过二段浸出，锌总收率可提高至95.9 %；浸出液采用足量锌粉还原除杂后，净化液中铜为0.51 mg／L，铬为0.18 mg／L，铅可降至0.10 mg／L以下；净化液经过蒸氨和焙烧制得的氧化锌含量为99.53%（以氧化锌计）。该方法具有工艺简单、能耗低、浸出率较高、浸出过程对环境较友好等优点。 |
| 关键词：氧化锌矿；浸出；净化；氧化锌 |
| 中图分类号：TF111.3 文献标识码：A 文章编号：1009-9212（2010）03-0053-04 |
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| Study on Leaching Low-grade Zinc Oxide Ore in the System of NH3-NH4HCO3-H2O for Preparing Zinc Oxide |
| JIANG Chong-wen ，LUO Yi*，ZHONG Hong
（School of Chemistry and Chemical Engineering，Central South University，Changsha 410083，China） |
| Abstract：A process using NH3-NH4HCO3-H2O system as the leaching agent has been applied for treatment of low-grade zinc oxide ore．The impurities in the leachate were removed by zinc powder through replacement reaction. Results showed that the ores of 177 μm size were leached for 3 h at 50 ℃ in the presence of 7 mol／L ammonia and 0.62 mol／L NH4HCO3 and liquid to solid ratio of 5∶1，the leaching rate of Zn reached 87.2%. The yield of Zn was up to 95.9% after two stage leaching. After purification，the contents of Cu and Cd in leach liquor were 0.51 mg／L and 0.18 mg／L，respectively，while that of Pb was less than 0.10 mg／L. The purity of zinc oxide reached 99.53% after distillation of ammonia and calcination. The method has the advantages of simple process，low power consumption，high extraction rate of zinc and environmentally benign. |
| Key words：zinc oxide ore；leaching；purification；zinc oxide |
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作者简介：蒋崇文（1968-），男，湖南娄底人，副教授，硕士研究生导师，从事二次资源的转化与利用研究。（E-mail：jiangchw2003@yahoo.com.cn）
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联 系 人：罗 艺，硕士研究生，从事有色金属冶金工艺研究。（E-mail：puddingguoguo@126.com）
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收稿日期：2010-04-10
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