A method for measuring the cation exchange capacity of weathering crust elution type rare earth ores
A weathering crust elution type, cation exchange technology, applied in the direction of measuring devices, material separation, instruments, etc., can solve the problems of low accuracy of measurement results and high requirements for cleanliness, and achieve good analysis accuracy and repeatability, The effect of simple operation device and low cost
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Embodiment 1
[0030] Dingnan Rare Earth Mine in Jiangxi was dried, 2.9992g and 3.0004g of ore samples were weighed twice, and 50 mL of neutral ammonium acetate solution with a concentration of 1.0 mol / L was added, stirred evenly, and the solid and liquid were separated, and the supernatant was discarded. Repeat the treatment of the ore sample 6 times; then add 40 mL of distilled water to wash away the residual ammonium acetate solution in the ore sample, separate the solid and liquid, discard the supernatant, and repeat the washing 4 times; add a small amount of distilled water to the processed ore sample, Stir evenly, and transfer to a 150 mL Kjeldahl bottle, the volume of distilled water is 60 mL, then add 1.0 g of solid magnesium oxide and 2.0 mL of liquid paraffin for distillation, and absorb the distilled ammonia with 30.0 mL of boric acid indicator solution, and wait for distillation After the total volume of the liquid reaches 160 mL, check with Na's reagent until there is no yellow r...
Embodiment 2
[0044] Fujian Ninghua rare earth mine was dried, and the ore samples 2.9974 g and 3.0136 g were weighed twice, and 40 mL of neutral ammonium acetate solution with a concentration of 2.0 mol / L was added, stirred evenly, and the solid and liquid were separated, and the supernatant was discarded. Repeat the treatment of the ore sample 5 times; then add 50 mL of distilled water to wash away the residual ammonium acetate solution in the ore sample, separate the solid and liquid, discard the supernatant, and repeat the washing 6 times; add a small amount of distilled water to the processed ore sample, Stir evenly, and transfer to a 150 mL Kjeldahl bottle, the volume of distilled water is 80 mL, then add 2.0 g of solid magnesium oxide and 4.0 mL of liquid paraffin for distillation, the distilled ammonia is absorbed with 28.0 mL of boric acid indicator solution, and then distilled After the total volume of the liquid reaches 154 mL, check with Na's reagent until there is no yellow reac...
Embodiment 3
[0047] Jiangxi Longnan Rare Earth Mine was dried, weighed 4.0015 g and 3.9981 g ore twice, added 60 mL of neutral ammonium acetate solution with a concentration of 1.0 mol / L, stirred evenly, separated the solid and liquid, discarded the supernatant, and repeated Process the ore sample 6 times; then add 50 mL of distilled water to wash away the residual ammonium acetate solution in the ore sample, separate the solid from the liquid, discard the supernatant, and repeat the washing 5 times; add a small amount of distilled water to the processed ore sample, and stir evenly , and transferred to a 150 mL Kjeldahl bottle, the volume of distilled water is 65 mL, then add 1.5 g solid magnesium oxide and 2.5 mL liquid paraffin for distillation, the distilled ammonia is absorbed with 25.0 mL boric acid indicator solution, and the distillate After the total volume reaches 158 mL, check with Na's reagent until there is no yellow reaction; respectively pipette 25.90 mL and 25.48 mL of distil...
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