自動車 廢觸媒로부터 鹽酸浸出에 의한 白金族 金屬의 回收
Recovery of Platinum Group Metals from Spent Automotive Catalysts by Hydrochloric Acid Leaching
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초록
산화제로 질산 또는 하이포아염소산나트륨을 사용하는 염산침출에 의하여 자동차 폐촉매로부터 백금, 팔라듐 및 로듐 등의 백금족 금속을 추출하는 연구를 수행하였다. 산화제의 종류 및 주입량, 반응시간, 광액농도가 백금족 금속의 추출에 미치는 영향을 조사하였다. 침출액으로부터 백금족 금속은 알루미늄을 환원제로 사용하는 세멘테이션법으로 회수하였다. 하이포아염소산나트륨을 산화제로 사용하였을 때 백금족 금속의 추출율이 더 높았으며 최적침출조건은 염산농도 8M, 하이포아염소산나트륨 첨가량 1.4mole, 침출온도 90℃, 침출시간 180분, 광액농도 400g/L 이었다. 이 조건에서 백금, 팔라듐 그리고 로듐의 추출은 각각 96.1%, 93.6%, 77.3%이었다. 백금족 금속의 28당량인 2.0g의 알루미늄을 첨가하였을 때 백금, 팔라듐 그리고 로듐은 각각 98%, 98.8% 그리고 65.3%가 환원되었다.
Abstract
The extraction of platinum group metals such as Pt, Pd and Rh from spent automobile catalyst has been investigated by leaching in HCl solutions using HNO3 or NaOCl as a oxidant. The effect of type and amount of oxidant, reaction time and pulp density on the extraction of platinum group metals was examined. Platinum group metals were recovered by the cementation method using aluminum as a reducing agent. The extraction ratio was higher when NaOCl was used as a oxidant. The optimum leaching conditions were obtained to be: HCl 8M, the amount of NaOCl 1.4mole, leaching temperature 90℃, leaching time 180 minutes, pulp density 400g/L. Under the optimum conditions obtained, the extraction of Pt, Pd and Rh were 96.1%, 93.6% and 77.3%, respectively. With the addition of 2.0g of aluminum which corresponds to 28 equivalent the reduction were 98% for Pt, 98.8% for Pd and 65.3% for Rh, respectively.
참고문헌 (13)
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