소다焙燒 및 水浸出法에 의한 脫窒用 廢 SCR 觸媒로부터 바나듐과 텅스텐 浸出
Leaching of Vanadium and Tungsten from Spent SCR Catalysts for De-NOx by Soda Roasting and Water Leaching Method
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초록
탈질용 선택적 촉매 환원(SCR) 촉매는 화력발전소의 탈질 시스템에서 발생한다. 폐 SCR 촉매로부터 바나듐 및 텅스텐과 같은유가금속을 회수하기 위한 공정은 소다배소 및 수침출 법으로 이루어진다. 본 연구에 사용된 폐 SCR 촉매는 V2O5 1.23 %, WO37.73 %를 함유하고 있다. 소다배소 공정은 바나듐과 텅스텐 화합물을 수용성의 물질로 전환시켜 주는 역할을 하며, 실험은 Na2CO3첨가량 5 당량, 배소온도 850 ℃, 배소시간 120 분, 폐촉매 입자크기 54 μm의 조건에서 수행하였다. 소다배소 실험 이후 배소산물을 사용하여 수침출 실험을 수행하였다. 침출실험을 위한 배소산물은 –45 μm의 입자크기로 분쇄하였으며, 수침출 실험조건은 침출온도 40 ℃, 침출시간 30 분, 광액밀도 10 %이다. 소다배소 및 수침출 실험결과, 바나듐 46 %, 텅스텐 92%의 침출율을 얻었다.
Abstract
Selective catalytic reduction(SCR) catalysts are obtained from de-NOx system of thermoelectric power plant. A process was developed for valuable metals such as vanadium and tungsten recovery from spent SCR catalyst by using soda roasting followed by water leaching. Spent SCR catalyst having V2O5(1.23 mass %) and WO3(7.73 mass %). For getting soluble metal forms of the targeted metals like vanadium and tungsten soda roasting process was implemented. In soda roasting process, sodium carbonate added 5 equivalent ratio at roasted temperature 850 ℃ with 120 min roasted time for 54 μm particle size of spent SCR catalyst. After soda roasting process moved to water leaching for roasted spent catalyst. Before leaching process the roasted spent catalyst was grinded up to −45 μm size. The leaching time is 30 min at 40 ℃ temperature, 10 % pulp density. The final leaching efficiency obtained 46 % of vanadium and 92 % of tungsten from present process.
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