Method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum and silicon wastes
A rare earth and aluminum-silicon technology, applied in chemical instruments and methods, preparation/processing of rare earth metal compounds, rare earth metal nitrates, etc., can solve the problems of high recovery cost and low recovery efficiency, and achieve reduction of recovery cost and consumption. , the effect of reducing the amount of
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Embodiment 1
[0051] After slurrying the rare earth-containing aluminum-silicon waste, the liquid-solid ratio is 3:1, add 1mol / L hydrochloric acid to treat the rare-earth-containing aluminum-silicon waste, control the pH value of the reaction process to 2.5, and mechanically stir at 10°C (200rad / min) After leaching for 12 hours, control the pH of the solution at the end of the reaction to 2.0; filter to obtain the acid leaching solution containing rare earth and aluminum and silicon-rich slag. The leaching rates of aluminum, rare earth and silicon (all as oxides) in the acid leaching solution containing rare earth and aluminum were 66.9%, 85.3% and 3.5%, respectively.
Embodiment 2
[0055] Before the acid leaching reaction, the rare earth-containing aluminum-silicon waste is crushed, ground, and slurried. After sizing, the liquid-solid ratio is 4:1. Add 3mol / L hydrochloric acid to treat rare earth-containing aluminum-silicon waste, control the pH value of the reaction process to 2.0, leaching with mechanical stirring (180rad / min) at 20°C for 8h, and control the pH of the solution at the end of the reaction=1.8; filter to obtain rare earth and aluminum-containing pickling solution and silicon-rich slag. The leaching rates of aluminum, rare earth and silicon in the acid leaching solution containing rare earth and aluminum (all calculated as oxides) were 73.6%, 89.2% and 4.2%, respectively.
Embodiment 3
[0057] The liquid-solid ratio is 5:1 after slurrying the rare earth-containing aluminum-silicon waste. Add 5mol / L hydrochloric acid to treat the aluminum-silicon waste containing rare earth, control the pH value of the reaction process to 1.8, leaching with mechanical stirring (220rad / min) at 40°C for 6h, and control the pH of the solution at the end of the reaction=1.5; filter to obtain the rare earth and aluminum-containing pickling solution and silicon-rich slag. The leaching rates of aluminum, rare earth and silicon (calculated as oxides) in the acid leaching solution containing rare earth and aluminum were 77.2%, 91.5% and 4.5%, respectively.
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