Method for recovering rare-earth waste material
A rare earth waste and recovery method technology, applied in the direction of improving process efficiency, can solve the problems of aluminate rare earth resource waste, increase rare earth loss, increase process flow, etc., and achieve landfill cost reduction, energy saving, and recovery rate high effect
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Embodiment 1
[0053] The rare earth waste is the cerium magnesium aluminate directly recovered from the phosphor green powder production section, and the main component is Ce0.67Mg0.33A111019:Tb 3+ , containing some other impurities.
[0054] When recycling, add 200g calcite powder (20 mesh particle size) and 20g lithium chloride (20 mesh particle size) to 100g cerium magnesium aluminate, mix evenly; heat the mixture to 1400°C for 6 hours; then add to the roasted product Add 33wt% hydrochloric acid to dissolve until the pH is 1, add 3g thiourea at the same time during the acid dissolution process to promote the dissolution of the roasted product; after the dissolution is completed, filter and separate to obtain the acid leaching solution and acid leaching residue. The acid leaching residue mainly contains non-rare earth elements such as Si, Ba, Ca, etc. The leaching rate of rare earth elements in the acid leaching solution is 93.2%. After adjusting the pH of the pickling solution to 2, ext...
Embodiment 2
[0056] The rare earth waste is phosphor recycling waste, which contains red powder yttrium oxide europium and green powder and blue powder rare earth aluminate.
[0057] When recycling, add 20g magnesium oxide powder (400 mesh particle size) and 10g lithium tetraborate (400 mesh particle size) to 100g fluorescent powder recovery waste, mix well; heat the mixture to 1000°C for 1 hour; then add 30wt % hydrochloric acid is dissolved to pH 1, and 10mL hydrogen peroxide (volume concentration is 30%) is added simultaneously during the acid dissolution process to promote the dissolution of the roasted product; The acid leaching residue is mainly composed of non-rare earth components such as Si, Ba, Ca, etc. The leaching rate of rare earth elements in the acid leaching solution is 95.7%. Add 75g of solid oxalic acid to the acid leaching solution to obtain 45g of rare earth precipitates. Add carbonic acid to the oxalic acid precipitation mother solution Ammonium hydrogen adjusts the pH...
Embodiment 3
[0059] The rare earth waste is phosphor recycling waste, which contains red powder yttrium oxide europium and green powder and blue powder rare earth aluminate.
[0060] When reclaiming, add 10wt% hydrochloric acid to pH and equal 1 to 100g fluorescent powder recycling waste, dissolve the red powder yttrium oxide europium composition wherein, filter and separate and obtain primary pickling liquid and primary pickling slag; 35g), add 30g limestone powder (particle size is 180 mesh) and 1g calcium chloride (particle size is 80 mesh), mix uniformly; Mixed material is heated to 600 ℃ roasting 4 hours, add 33wt% hydrochloric acid and dissolve to pH be 1, During the acid dissolution process, 0.5 g of thiourea and 1 mL of hydrogen peroxide (volume concentration: 30%) were added simultaneously to promote the dissolution of the roasted product; after the dissolution was completed, the secondary acid leaching solution and secondary acid leaching residue were obtained by filtration and se...
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