| 第 40 卷第 3 期 |  | Vol. 40 No. 3 | | 2010 年 6 月 | Jun 2010 |
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所屬欄目：功能材料
低品位氧化鋅礦氨-碳酸氫銨浸出制備氧化鋅工藝的研究 |
| 蔣崇文，羅 藝*，鐘 宏
（中南大學(xué) 化學(xué)化工學(xué)院，湖南 長(cháng)沙 410083） |
| 摘 要：采用氨-碳酸氫銨溶液從低品位氧化鋅礦中浸出制備氧化鋅。研究結果表明，在氨水濃度7 mol／L、碳酸氫銨濃度0.62 mol／L、浸出溫度50℃、氧化鋅礦粉粒度為177 μm、液固比5∶1、浸出時(shí)間3 h的條件下，鋅一段浸出率為87.2 %，經(jīng)過(guò)二段浸出，鋅總收率可提高至95.9 %；浸出液采用足量鋅粉還原除雜后，凈化液中銅為0.51 mg／L，鉻為0.18 mg／L，鉛可降至0.10 mg／L以下；凈化液經(jīng)過(guò)蒸氨和焙燒制得的氧化鋅含量為99.53%（以氧化鋅計）。該方法具有工藝簡(jiǎn)單、能耗低、浸出率較高、浸出過(guò)程對環(huán)境較友好等優(yōu)點(diǎn)。 |
| 關(guān)鍵詞：氧化鋅礦；浸出；凈化；氧化鋅 |
| 中圖分類(lèi)號：TF111.3 文獻標識碼：A 文章編號：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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作者簡(jiǎn)介：蔣崇文（1968-），男，湖南婁底人，副教授，碩士研究生導師，從事二次資源的轉化與利用研究。（E-mail：jiangchw2003@yahoo.com.cn）
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聯(lián) 系 人：羅 藝，碩士研究生，從事有色金屬冶金工藝研究。（E-mail：puddingguoguo@126.com）
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收稿日期：2010-04-10
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