Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Leaching of Vanadium and Tungsten from Spent SCR Catalysts for De-NOx by Soda Roasting and Water Leaching Method

소다배소(焙燒) 및 수침출법(水浸出法)에 의한 탈질용(脫窒用) 폐(廢) SCR 촉매(觸媒)로부터 바나듐과 텅스텐 침출(浸出)

  • Received : 2012.09.26
  • Accepted : 2012.11.26
  • Published : 2012.12.31
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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 $V_2O_5$(1.23 mass %) and $WO_3$(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 $850^{\circ}C$ with 120 min roasted time for $544{\mu}m$ 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 $-45{\mu}m$ size. The leaching time is 30 min at $40^{\circ}C$ temperature, 10 % pulp density. The final leaching efficiency obtained 46 % of vanadium and 92 % of tungsten from present process.

탈질용 선택적 촉매 환원(SCR) 촉매는 화력발전소의 탈질 시스템에서 발생한다. 폐 SCR 촉매로부터 바나듐 및 텅스텐과 같은 유가금속을 회수하기 위한 공정은 소다배소 및 수침출 법으로 이루어진다. 본 연구에 사용된 폐 SCR 촉매는 $V_2O_5$ 1.23 %, $WO_3$ 7.73 %를 함유하고 있다. 소다배소 공정은 바나듐과 텅스텐 화합물을 수용성의 물질로 전환시켜 주는 역할을 하며, 실험은 $Na_2CO_3$ 첨가량 5 당량, 배소온도 $850^{\circ}C$, 배소시간 120 분, 폐촉매 입자크기 $54{\mu}m$의 조건에서 수행하였다. 소다배소 실험 이후 배소산물을 사용하여 수침출 실험을 수행하였다. 침출실험을 위한 배소산물은 $-45{\mu}m$의 입자크기로 분쇄하였으며, 수침출 실험조건은 침출온도 $40^{\circ}C$, 침출시간 30 분, 광액밀도 10 %이다. 소다배소 및 수침출 실험결과, 바나듐 46 %, 텅스텐 92%의 침출율을 얻었다.

Keywords

Acknowledgement

Supported by : 환경부

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  2. Green Recovery of Titanium and Effective Regeneration of TiO2 Photocatalysts from Spent Selective Catalytic Reduction Catalysts 2018, https://doi.org/10.1021/acssuschemeng.7b03038
  3. Research Status and Development Trend of Recovery and Treatment of Waste Titanium-Based SCR Denitration Catalysts vol.08, pp.04, 2018, https://doi.org/10.12677/HJCET.2018.84029
  4. Sustainable Approach for Spent V2O5-WO3/TiO2 Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO3-T vol.6, pp.9, 2012, https://doi.org/10.1021/acssuschemeng.8b03192