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.
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