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硝酸型废退锡水的分离特性与蒸馏强化偏锡酸回收
引用本文:金分丽,查正炯,王永成,周桓.硝酸型废退锡水的分离特性与蒸馏强化偏锡酸回收[J].无机盐工业,2022,54(8):101-106.
作者姓名:金分丽  查正炯  王永成  周桓
作者单位:1.天津科技大学化工与材料学院,天津市卤水化工与资源生态化利用重点实验室,天津 3004572.广州科城环保技术有限公司
基金项目:国家自然科学基金项目(U1707602)
摘    要:针对电路板硝酸型废退锡液再生和锡提取技术的改进,对硝酸型废退锡水的物理化学特征、氧化还原与沉淀反应规律、真空蒸馏特性进行了理论分析和实验研究。结果表明:硝酸溶液中三价铁离子的存在可以将锡离子氧化为四价;硝酸浓度的提高可促进β型偏锡酸沉淀的形成;蒸馏是硝酸的浓缩过程,当水的蒸出率达到67.75%时,硝酸质量分数提高到40.04%,锡的质量分数降到了0.04%。废退锡水中锡以β型偏锡酸形式析出,析出率达到97.36%。经过蒸馏强化所获得沉淀物具有更好的沉淀特性;蒸馏底液保留了退锡水的有效成分,可作为再生退锡水。

关 键 词:废退锡水  β型偏锡酸  退锡水再生  沉淀反应  蒸馏  
收稿时间:2021-11-25

Separation characteristics of nitric acid type tin stripping waste solution and distillation enhanced recovery of meta stannic acid
JIN Fenli,ZHA Zhengjiong,WANG Yongcheng,ZHOU Huan.Separation characteristics of nitric acid type tin stripping waste solution and distillation enhanced recovery of meta stannic acid[J].Inorganic Chemicals Industry,2022,54(8):101-106.
Authors:JIN Fenli  ZHA Zhengjiong  WANG Yongcheng  ZHOU Huan
Affiliation:1.College of Chemical Engineering and Materials,Tianjin University of Science & Technology,Tianjin Key Lab of Brine Chemical Engineering and Ecological Utilization of Resources,Tianjin 300457,China2.Cosmo Environmental Technology Co. ,Ltd.
Abstract:Aiming at the improvements of regeneration technology and tin extraction mothed of nitric acid type tin stripping waste solution for PCB industries,the physical and chemical characteristics,the behaviors of redox and precipitation reactions,and vacuum distillation characteristics of waste tin stripping solution were theoretically analyzed and experimentally studied.The results showed that Fe3+ in nitric acid solution could oxidize tin ion to tetravalent.The increase of nitric acid concentration promoted the precipitation formation of β-type meta stannic acid.Vacuum distillation was the concentration process of nitric acid.When the evaporation rate of water reached 67.75%,the mass ratio of nitric acid increased to 40.04% and the mass ratio of tin decreased to 0.04%.Tin in the waste tin stripping water was precipitated in the form of β-metastannic acid,and the precipitation rate reached 97.36%.The precipitate β-metastannic acid obtained by distillation had better precipitation characteristics.The distillation bottom liquid retained the effective components of tin stripping liquid and could be used to mix tin stripping liquid.
Keywords:tin stripped waste liquid  β-metastannic acid  tin stripping solution regeneration  precipitation reaction  vacuum distillation  
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