| Abstract |
Phosphor powder from waste cathode ray tubes (CRT) was leached by acid leaching technology, and also, "H2SO4 + H2O2" system was utilized to reduce the release of poisonous gas H2S into atmosphere, single factor method was used to determine the optimal operation conditions (H2SO4 concentration, the volume of H2O2 and H2SO4, temperature, time and the ratio of liquid and solid). Moreover, a quantitative analysis on recovery benefits was conducted to evaluate the effect of this method. Our results demonstrated that the recovery of Y and Eu has highly positive profits, as their price reached 1018.69 CNY/kg and 380.64 CNY/kg, separately. However, the recovery of Zn and Al has negative profits was due to its lower enrichment factors (EFs) and market price in comparison with Y and Eu. In general, this technology has a great potential to recover four major metals from waste phosphor powder, about 757.04 CNY per kilogram powder economic value can be produced using this process. Therefore, using "H2SO4 + H2O2" system for recycling Zn, Al, Y and Eu is a green and sustainable technology from waste cathode-ray tube fluorescent powder. (C) 2016 Elsevier Ltd. All rights reserved. |
