On the basis of dilute hydrochloric acid pretreatment

recovery of rare earth from waste CRT phosphor was further studied

and a process route was developed. After dilute acid pretreatment

optimum conditions for recovering rare earth from waste CRT phosphor were: concertration of hydrochloric acid for hydrolysis of residual phosphor solids 5 mol·L-1

reaction temperature 80℃

pH value of leaching liquor after hydrolysis reaction 5.5

ratio of diethyldithiocarbamate (DDTC) and phosphors dosage 6:1

calcination temperature of rare earth oxalate precipitation 900℃. The total content of rare earth products Y2O3 and Eu2O3 was 99.2%. The crystal particles of rare earth product possessed polyhedral structure built by the accretion of flaky crystals. The particles were embeded in each other with mosaic contact.