Carbonate deposition method of crystal type heavy rare earth
A carbonate precipitation and heavy rare earth technology, applied in the direction of process efficiency improvement, etc., can solve the problems affecting the recovery rate of rare earths, high moisture content of products, high precipitation costs, etc., to achieve convenient transportation and subsequent use, high recovery rate of rare earths, The effect of low moisture content in the product
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[0006] Example one
[0007] After mixed rare earth extraction and grouping, the heavy rare earth chloride solution is 1200L, the rare earth concentration is 1.47M, the acidity is 0.78N, and the main impurity is Fe 2 O 3 183mg / L, CaO 30.5mg / L, PbO 0.8mg / L, rare earth distribution Dy 2 O 3 0.11%, Ho 2 O 3 2.075%, Er 2 O 3 7.99%, Tm 2 O 3 0.99%, Yb 2 O 3 5.7%, Lu 2 O 3 0.77%, Y 2 O 3 81.8%, the calculated average molecular weight is 122.13, and the heavy rare earth chloride solution contains 215.44Kg of heavy rare earth oxides. Add the heavy rare earth chloride solution to the precipitation tank first, adjust the pH value of the heavy rare earth chloride solution to 5.2 with 10% ammonium bicarbonate water under stirring, add 3.6L of polyacrylamide saturated aqueous solution and fully stir and mix, let stand for 5 hours to clarify; The above solution is filtered, the filtrate is pumped to the precipitation tank, diluted with water to 0.5M, 251.33Kg of heavy rare earth carbonate reserv...
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[0009] Example two
[0010] After mixed rare earth extraction and grouping, the heavy rare earth chloride solution is 1500L, the rare earth concentration is 1.55M, the acidity is 0.66N, and the main impurity is Fe 2 O 3 205mg / L, CaO 32.2mg / L, PbO 0.68mg / L, rare earth distribution Dy 2 O 3 0.08%, Ho 2 O 3 2.18%, Er 2 O 3 8.03%, Tm 2 O 3 0.94%, Yb 2 O 3 5.57%, Lu 2 O 3 0.69%, Y 2 O 3 82.06%, the calculated average molecular weight is 121.8, and the heavy rare earth chloride solution contains 283.19Kg of heavy rare earth oxide. The heavy rare earth chloride solution is added to the sedimentation tank, and the pH value of the heavy rare earth chloride solution is adjusted to 5.0 with 8% ammonium bicarbonate water under agitation. 1.5L of saturated aqueous polyacrylamide solution is added and fully stirred and mixed. Let stand for 2 hours to clarify. The above solution is filtered, the filtrate is pumped to the sedimentation tank, diluted with water to 0.4M, and 242.24kg of heavy rare ...
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