Study on closed recycling regeneration process of FeCl3 waste etching solution and recovery of Copper

International Conference on Water Resource and Environment 2016

地球科学;生态环境科学

Miao, X.F.^1 ; Zhou, X.T.^1 ; Wang, R.X.^1 ; Zhai, D.H.^1 ; Ran, H.H.^1

Institute of Chemical Machinery, East China University of Science and Technology, Shanghai, China^1

关键词: Copper chlorides;    Corrosion property;    Etching process;    Etching solutions;    Inlet pressures;    Regeneration process;    Separation efficiency;    Washing process;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/39/1/012046/pdf
DOI  :  10.1088/1755-1315/39/1/012046

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

FeCl3etching solution is widely used in etching processes due to its strong oxidation and corrosion properties. However, significant amounts of waste etching solution is produced, which pollutes the environment and wastes materials. Aiming to address problems related to the use of recycled FeCl3waste etching solution containing Cu, the crystallization regeneration process in an enterprise was improved and the copper element was recovered in the form of copper chloride crystal. Based on the original process, a hydrocyclone was added to preseparate the slurry. By investigating the change of the inlet flow rate and separation efficiency of the hydrocyclone with inlet pressure under different concentrations, the optimal inlet pressure was determined to be approximately 0.25Mpa. Experimental results indicated that the workload of the centrifuge was reduced by approximately 80%, the average specific surface area of the copper chloride crystal was decreased by 50%, the production of copper chloride crystal byproducts after washing process was increased by approximately 20% and regeneration of FeCl3waste etching solution was also realized.