Synthesis of Cuprous Oxides Using Copper Recovered from Wastewater
Cuprous oxide is one of the oldest antifouling agents and also acts as red pigment in these paints.In printed circuit board manufacturing industries,waste etchant contains a substantial amount of copper ion.In the present study,a process was suggested for recovering cuprous oxides from the waste etchant and optimum conditions were investigated to recover the cuprous oxides.The process consists of two steps: in first step,Cu powder is added into wastewater solution,and cupric ions reduce into cuprous ions (Cu+Cu2+→2Cu+),where cuprous ions precipitate as cuprous chloride;In second step,cuprous oxide is synthesized by adding NaOH into cuprous chloride solution (2CuCl+NaOH→Cu2O+NaCl+H2O).Optimum conditions were investigated to recover cuprous oxide in the processes.When copper powder was added into wastewater with copper ions,Cu concentration decreased from 15.6% to 2.6% and ORP decreased from 620 mV to -59.9 mV.This result shows that cupric ions reduced into cuprous ions.XRD data indicated that the precipitate was cuprous chloride powder.Using the cuprous chloride recovered and NaOH solution,cuprous oxide was synthesized.To investigate the optimum condition,various NaOH solutions were added into water with CuCl,and then pH,ORE Cu concentration,Cu contents in precipitates were analysed.XRD data showed that main component of precipitates was cuprous oxide.
Cuprous oxide Cu recovery Waste etchant Cuprous chloride
K.Yoo S.M.Son J.M.Yoo M.S.Kim J.Jeong J.C.Lee
Minerals & Materials Processing Division,Korea Institute of Oeoscience & Mineral Resources,Korea
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3834-3837
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）