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.
|Publication status||Published - 2017 Jan 1|
|Event||14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, Japan|
Duration: 2017 Sep 26 → 2017 Sep 29
|Conference||14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017|
|Period||17-09-26 → 17-09-29|
All Science Journal Classification (ASJC) codes
- Environmental Science(all)