Technologies of twice dissolved by hydrochloric acid for waste rare earth luminescent materials
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United States of America Patent
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Apr 26, 2016
Grant Date -
Aug 13, 2015
app pub date -
Jan 17, 2013
filing date -
Aug 10, 2012
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Abstract
The invention belongs to the field of recycling of resources, in particular to a method for waste rare earth luminescent material by dual hydrochloric acid. First hydrochloric acid was used to dissolve the red phosphor powder (Y2O3:Eu) priority, and yttrium-rich rare earth chloride solution and residue were obtained after filtered. Residue's major components were green and blue phosphor powder, and the removal of Ca2+ in filtrate was conducted by using Na2SO4, and CaSO4 precipitation separation was conducted to get rich rare earth chloride solution, europium and yttrium. Residue was mixed with alkali to perform alkaline fusion at high temperature to decompose green and blue powder, then sodium aluminate, magnesium, barium and rare earth oxides were obtained. Alkaline fusion products were washed with water, and filtered, and then sodium aluminate solution and residues containing rare earth oxides were obtained.
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