Recycle of Vanadium from waste SCR catalysts by series ion exchange column

Zi Wei Yeh, Ya Yun Shih, Yun Hwei Shen

Research output: Contribution to conferencePaper

Abstract

Selective catalytic reduction (SCR) is widely used in steel industry to remove NOx in exhaust gas treatment because of its great efficiency. The lifespan of SCR is about 2 years. It is estimated that there is more than 1,000 tons of waste SCR annually in Taiwan. The main chemical composition of waste SCR is 0.58 wt% V, 0.73wt% As,68.96wt% Ti, 17.16 wt% Si,4.79wt% Mo, 3.81wt% Fe, 3.45wt% Al, 0.46wt% P, 0.04wt% Ca, 0.02wt% W. In this experiment, the waste SCR was subjected to alkali roasting, hot water leaching and the series ion exchange column. 98% of Vanadium was leached out through alkali roasting and hot water leaching. For series ion exchange columns, the optimal pH and flow rate were 8 and 5.5BV/Hr to separate Vanadium and Arsenic. The optimal desorption agent and flow rate were 5N NH4OH + 2N NH4CL and 0.92BV/Hr, where Vanadium and Arsenic were 99.7% and 0% desorbed. Finally, rotary evaporator was chosen to crystallize into NH4VO3. The purity of final product is 99.5% with no As detected.

Original languageEnglish
Publication statusPublished - 2017 Jan 1
Event14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, Japan
Duration: 2017 Sep 262017 Sep 29

Conference

Conference14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
CountryJapan
CitySapporo, Hokkaido
Period17-09-2617-09-29

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)

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