Method for selectively extracting non-cerium rare earth in mixed rare earth concentrate
A mixed rare earth, selective technology, applied in the field of hydrometallurgy, can solve the problems of non-reuse, difficult to recycle, etc.
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Embodiment 1
[0027] 100g bastnaesite and monazite mixed rare earth concentrate (REO: 64.0%, P 2 o 5 : 6.8%) was oxidized and roasted in air at 550° C. for 1 hour to form 85 g of oxidized roasted ore. The roasted ore was uniformly mixed with 68 g of concentrated sulfuric acid with a mass percentage of 98%, and then roasted at 150°C for 2 hours. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:5, and the sulfuric acid roasted ore is soaked in water to adjust slurry and separate from solid and liquid to obtain 590ml of cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 0.2g / L, CeO 2 The dissolution rate was 48.0%, P 2 o 5 The dissolution rate was 9.4%.
Embodiment 2
[0029] 100g bastnaesite and monazite mixed rare earth concentrate (REO:52.0%, P 2 o 5 : 8.9%) were oxidized and roasted in air at 400°C for 3 hours. The formed 82.7g oxidized roasted ore was mixed evenly with 74.4g of 92% concentrated sulfuric acid by mass percentage, and then roasted at 600° C. for 1 hour. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:6, and the sulfuric acid roasted ore is soaked in water for slurry adjustment and solid-liquid separation to obtain 730ml of cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 2 The dissolution rate was 20.0%, P 2 o 5 The dissolution rate was 3.2%.
Embodiment 3
[0031] 100g bastnaesite and monazite mixed rare earth concentrate (REO:63.5%, P 2 o 5 : 8.8%) was oxidized and roasted in air for 1 hour at 650°C to form 86.5g of oxidized roasted ore. The oxidized roasted ore was uniformly mixed with 103.8 g of concentrated sulfuric acid with a mass percentage of 85%, and then roasted at 300° C. for 1.5 hours. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:7, and the sulfuric acid roasted ore is soaked in water for slurry adjustment and solid-liquid separation to obtain 880ml cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 0.18g / l, CeO 2 The dissolution rate was 37.8%, P 2 o 5 The dissolution rate was 6.8%.
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