黃酸溶液으로부터 DOWEX G-26에 의한 구리의 回收
Ion Exchange of Copper from Sulphate Effluent using DOWEX G-26
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초록
본 연구는 전자산업으로부터 발생하는 CMP 폐수와 유사한 0.3~0.5 mg/ml 구리를 함유한 조제 황산 용액으로부터 DOWEX G-26 양이온 교환 수지를 사용한 구리 회수 공정 개발에 관한 것이다. 함구리 황산 용액으로부터 구리를 회수하기 위해 용액의 pH, 수지의 사용량, 용액의 산 농도, 용액과 수지의 접촉시간 등을 변수로 다양한 조건에서의 회수 실험을 실시하였다. 평형 pH 2.5, 용액/수지의 비 100 mL/g 조건에서 14분의 접촉으로 99.99%의 구리가 흡착되었다. 구리의 흡착은 Langmuir isotherm을 따랐으며, 반응차수는 2차였다. 흡착된 구리는 묽은 황산에 의해 수지로부터 효과적으로 용리되었으며, 이로부터 구리 농축용액을 만들 수 있었다.
Abstract
In view of the increasing importance of the waste recycling to meet the strict environmental regulations, the present investigation reports an adsorption process using cationic exchanger DOWEX G-26 for the recovery of copper from the synthetic sulphate solutions containing copper 0.3 to 0.5 mg/ml, similar to the CMP waste effluent of electronic industry. Various process parameters viz. contact time, solution pH, resin dose, and A/R ratio for elution were investigated to recover copper from the effluents. Complete adsorption of copper from the solution was achieved at equilibrium pH 2.5 and aqueous / resin (A/R) ratio of 100 ml/g in 14 minutes contact time. The adsorption of copper on DOWEX G-26 resin was found to follow the Langmuir isotherm and second order reaction. The copper was eluted from loaded resin with dilute sulphuric acid to produce copper-enriched solution.
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