Method for recovering rare earth elements from waste red phosphor
A red phosphor, rare earth element technology, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as rare earth recycling not involved
Active Publication Date: 2012-10-24
JIANGXI HUAKE RARE EARTH NEW MATERIALS
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Problems solved by technology
The invention relates to a method for recovering rare earth elements from waste red phosphor. The method is characterized by: carrying out a calcination pretreatment on collected waste red phosphor in a calcination furnace kiln, and removing organic substances and other elements easily forming volatile gases in the red phosphor; carrying out dissolution decomposition on the calcined red phosphor in an acid (HCl, HNO3)-oxidant (H2O2)-stabilizing additive (acetic acid) composite acid system, and controlling to obtain a low acidity, such that rare earth elements such as Y and Eu or other rare earth in the red phosphor are preferentially dissolved, and completely enter the solution, and the other elements are insoluble substances, and are removed by filtration; after obtaining a rare earth acid solution, adopting an ammonia-free saponified fractionation extraction system to carry out extraction separation to obtain a high purity single rare earth chloride such as YCl3 and EuCl3 or other chlorinated rare earth enriched product solutions; and carrying out processes of precipitation and ignition to obtain a single rare earth oxide such as Y2O3 and Eu2O3 or other rare earth enriched product oxide products.
Rare earth metal compounds
Rare-earth elementDecomposition +13
- Experimental program(12)
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