Inorganic Chemicals Industry >
Preparation process and product characterization of various copper oxychloride with respective crystal form from etching waste solution
Received date: 2021-02-08
Online published: 2021-11-15
Copper oxychloride produced from the reaction of acid and alkaline etching waste solution of printed circuit board are normal the mixture of multiple crystal forms,which affects the purity and performance of product.In order to produce copper oxychloride with single crystal form,the reaction conditions of feeding rate,temperature,pH were optimized in the continue crystallization process,and the products with single crystal form of Atacamite（type-A）,Botallackite（type-B） and Clinoatacamite（type-C） and with the respective purity of 99.0%,99.7% and 90.7% were obtained.The XRD and SEM results showed that type-A crystal belonged to orthorhombic and was the long strip and flake aggregates;type-B crystal belonged to monoclinic and was the hexagonal single crystal aggregates;type-C crystal also belonged to monoclinic but was the irregular flaky aggregates.Chemical analysis and TG-DSC showed that the molecular formula of A,B and C products was Cu4（OH）6Cl2·H2O,Cu5（OH）8Cl2 and CuCl2·3Cu（OH）2·0.5H2O,respectively.The activation energy and heat of decomposition of A,B and C products were different.Among the three products,B-type copper oxychloride had the highest copper content and the strongest thermal stability,which was the best crystal product in copper oxychloride production.
Junfang YANG , Huan ZHOU , Zhengjiong ZHA , Yongcheng WANG . Preparation process and product characterization of various copper oxychloride with respective crystal form from etching waste solution[J]. Inorganic Chemicals Industry, 2021 , 53(11) : 107 -113 . DOI: 10.19964/j.issn.1006-4990.2021-0092
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