Method for recovering phosphorus and rare earth from rare earth-containing phosphate rock
A rare earth and phosphate rock technology, applied in chemical instruments and methods, phosphorus compounds, process efficiency improvement and other directions, can solve the problems of difficult acid dissolution of rare earth fluoride, low rare earth recovery rate, difficult recovery, etc., and achieve low-cost comprehensive The effect of recovering rare earth, improving the recovery rate of rare earth, and reducing the viscosity of the system
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Embodiment 1
[0044] With 100g of phosphate rock containing 1.5% rare earth as raw material, adopt the mixed acid solution leaching of phosphoric acid and hydrochloric acid, the mass concentration of phosphoric acid in the mixed acid is 15% (in terms of P 2 o 5 content), the proportion of hydrochloric acid is 5% (in terms of moles of anions), and the liquid-solid ratio of the control system is 10:1. Add 1000mL of mixed acid solution, react at 55°C for 6h, and obtain monocalcium phosphate solution and 12.1g of phosphate-containing rare earth slag.
[0045] After testing, the leaching rate of rare earth in phosphate rock is 3.6%, and the leaching rate of phosphorus is 95.1%. Add sulfuric acid to the obtained monocalcium phosphate solution to remove calcium, and separate solid and liquid to form phosphorus-containing solution and gypsum, and recover phosphorus in the phosphorus-containing solution. And take part of the phosphorus-containing solution back for phosphate rock leaching treatment...
Embodiment 2
[0047] Using 100g of phosphate rock containing 3% rare earth as raw material, it is leached with a mixed acid solution of phosphoric acid and hydrochloric acid, and the mass concentration of phosphoric acid in the mixed acid is 20% (in terms of P 2 o 5 content), the proportion of hydrochloric acid is 5% (in terms of moles of anions), the liquid-solid ratio of the control system is 8:1, and 800mL of mixed acid solution is added, reacted at 70°C for 5h, and after filtration, monocalcium phosphate solution and 11.1g phosphate-containing rare earth slag.
[0048] After testing, the leaching rate of rare earth in phosphate rock is 3.4%, and the leaching rate of phosphorus is 98.1%. Add sulfuric acid to the obtained monocalcium phosphate solution to remove calcium, and separate solid and liquid to form phosphorus-containing solution and gypsum, and recover phosphorus in the phosphorus-containing solution. And take part of the phosphorus-containing solution back for phosphate rock ...
Embodiment 3
[0050] Using 100g of phosphate rock containing 3% rare earth as raw material, it is leached with a mixed acid solution of phosphoric acid and hydrochloric acid, and the mass concentration of phosphoric acid in the mixed acid is 45% (in terms of P 2 o 5content), the proportion of hydrochloric acid is 5% (in terms of moles of anions), the liquid-solid ratio of the control system is 8:1, and 800mL of mixed acid solution is added, reacted at 70°C for 5h, and after filtration, monocalcium phosphate solution and 10.6g rare earth slag containing phosphoric acid.
[0051] After testing, the leaching rate of rare earth in phosphate rock is 4.2%, and the leaching rate of phosphorus is 98.1%. Add sulfuric acid to the obtained monocalcium phosphate solution to remove calcium, and separate solid and liquid to form phosphorus-containing solution and gypsum, and recover phosphorus in the phosphorus-containing solution. And take part of the phosphorus-containing solution back for phosphate ...
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