用氨配合法从含锌废催化剂中回收锌

针对氧化锌易溶于氨-碳酸氢铵混合溶液中生成锌氨配合物这一特点，采用含锌废催化剂为原料，经化浆、高剪切分散后加入氨-碳酸氢铵溶液浸取，通过沉淀除杂、锌粉置换和热解蒸氨得到碱式碳酸锌。考察了高剪切分散机剪切速率、反应温度、浸取剂pH和浸取时间对锌浸出率的影响。结果表明，在剪切速率为25 000 r/min、反应温度为328 K、浸取剂pH=7.5、浸取时间为2 h的条件下，锌浸出率可达90%以上，制备的碱式碳酸锌优于HG/T 2523—2007《工业碱式碳酸锌》标准要求。该研究综合利用了含锌废催化剂，无二次污染产生，符合清洁生产和资源合理利用的要求。

Recovery of zinc from zinc-containing catalyst by ammonia complex method

According to the characteristics of zinc oxide being easily soluble in ammonia-ammonium bicarbonate mixed solu- tion of to generate ammonia zinc complexes，basic zinc carbonate was prepared by pulping，high shear emulsification，adding ammonia-ammonium bicarbonate leaching solution，impurity precipitation，zinc dust replacement，and ammonia evaporation by pyrolysis with the spent zinc containing catalyst as raw material.The effects of shear rate of high shear emulsifying machine， reaction temperature，pH of lixiviant，and leaching time on the zinc leaching rate were investigated.Results showed that the leaching rate of zinc can reach more than 90% under the following experimental conditions:shear rate was 25 000 r/min，the reaction temperature was 328 K，the pH of lixiviant was 7.5，and the leaching time was 2 h，the quality of basic zinc carbonate can exceed the requirement of ministerial standards of Basic Zinc Carbonate for Industrial Use（HG/T 2523—2007）.This study makes a comprehensive utilization of spent catalyst containing zinc without secondary pollution，meeting the requirements of clean production and rational utilization of resources.