Method for leaching bastnaesite-containing rare-earth ore concentrates in complexing mode and preparing kryocide
A rare earth concentrate, cryolite technology, applied in aluminum fluoride, process efficiency improvement, aluminum halide and other directions, can solve the problem of unable to solve the problem of fluorine recycling, large fluorine-containing waste water, pollution of the environment and other problems, achieve good Economic and environmental benefits, low equipment requirements, and good quality effects
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[0029] Example 1
[0030] Such as figure 1 As shown, weigh 2kg of Sichuan Mianning bastnaesite, with a rare earth oxide content of 61.5%. In a closed device with a condensing system, add 3mol / L hydrochloric acid at a liquid-solid ratio of 8:1, add 5ml analytical pure hydrofluoric acid, heat to 95℃, add the above concentrate, stir at a constant speed for 2 hours, and react After the end, it was cooled to 55°C, filtered and washed to obtain filtrate I and filter residue. The filtrate I is recycled.
[0031] Add HCl solution and AlCl to the filter residue 3 The solid is complexed and leached according to the following conditions: In a closed device with a condensation system, the HCl concentration is 6mol / L, and AlCl 3 The concentration was 2mol / L, the leaching temperature was 110°C, the liquid-solid ratio was 30:1, the mixture was stirred at a constant speed for 90 minutes and then cooled to 85°C for hot filtration, and the filter residue was washed with 85°C distilled water three ...
Example Embodiment
[0034] Example 2
[0035] Such as figure 1 As shown, weigh 2kg of Sichuan Mianning bastnaesite, with a rare earth oxide content of 61.5%. In a closed device with a condensing system, add 3mol / L hydrochloric acid at a liquid-to-solid ratio of 8:1, add 7g sodium fluoride solid, heat to 95°C, add the above concentrate, stir at a constant speed for 2 hours, the reaction is over Then it was cooled to 55°C, filtered and washed to obtain filtrate I and filter residue. The filtrate I is recycled.
[0036] Add HCl solution and AlCl to the filter residue 3 The solid is complexed and leached according to the following conditions: In a closed device with a condensation system, the HCl concentration is 6mol / L, and AlCl 3 The concentration is 2mol / L, the leaching temperature is 110°C, the liquid-to-solid ratio is 30:1, the mixture is stirred at a constant speed for 90 minutes and then cooled to 85°C for hot filtration, and the filter residue is washed 3 times with 85°C distilled water to obtai...
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[0039] Example 3
[0040] Such as figure 1 As shown, weigh 2 kg of Baotou mixed rare earth concentrate, and the bastnaesite content is 41.06%. In a closed device with a condensing system, add 3mol / L hydrochloric acid at a liquid-to-solid ratio of 8:1, add 6g calcium fluoride solids, heat to 95℃, add the above concentrate, stir at a constant speed for 2 hours, the reaction is over Then it was cooled to 55°C, filtered and washed to obtain filtrate I and filter residue. The filtrate I is recycled.
[0041] Add HCl solution and AlCl to the filter residue 3 The solid is complexed and leached according to the following conditions: In a closed device with a condensation system, the HCl concentration is 6mol / L, and AlCl 3 The concentration was 2mol / L, the leaching temperature was 110°C, the liquid-solid ratio was 30:1, the mixture was stirred at a constant speed for 90 minutes and then cooled to 85°C for hot filtration, and the filter residue was washed with 85°C distilled water three ti...
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