摘要
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p H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p H=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/T2523—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。
According to the characteristics of zinc oxide being easily soluble in ammonia-ammonium bicarbonate mixed solution 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,p H 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 p H 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.
出处
《无机盐工业》
CAS
北大核心
2016年第2期49-52,共4页
Inorganic Chemicals Industry
基金
2014年度湖南省高等学校科学研究项目:从含锌废催化剂制备纳米级氧化锌的工艺研究(14C0383)
关键词
含锌废催化剂
氨-碳酸氢铵
浸取
除杂
锌浸出率
zinc containing spent catalyst
ammonia-ammonium bicarbonate
leaching
purifying
zinc leaching rate
