Method for comprehensively recycling rare earth and fluorine in process of treating bastnaesite
A bastnasite and treatment process technology, applied in the field of rare earth hydrometallurgy, can solve the problems of increased environmental protection treatment costs, low-value utilization of high-value elements, and difficulty in meeting environmental protection requirements, saving chemical raw materials, and reducing production costs. Effects of Rare Earth Loss
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Embodiment 1
[0034] 65% REO bastnaesite was oxidized and roasted at 600°C for 0.5h. During the roasting process, 5wt% sodium sulfate was added to the bastnaesite as a roasting aid, and hydrochloric acid was used for leaching at 20°C for 10h. During the leaching process, 0.1 wt% cerium sulfate in the amount of bastnaesite is added as a catalytic leaching aid to obtain a cerium-poor rare earth chloride solution and fluorine-containing cerium-rich slag. The leaching rate of rare earth reached 72.3%, among which the leaching rate of non-cerium rare earth in bastnaesite reached 98.5%. CeO in fluorine-containing cerium-rich slag 2 / TREO reached 98.4%. The fluorine-containing cerium-rich slag undergoes hydrocyclone separation to obtain rare earth fluorides with a purity of 96.7%, of which CeO 2 / TREO is greater than 98%. The total yield of rare earths entering rare earth fluorides and rare earth chlorides reaches 98.1%. The sodium introduced by the roasting aid can be separated from the rare ...
Embodiment 2
[0036] Oxidize and roast 65% REO bastnaesite at 350°C for 5 hours, add 0.1wt% aluminum sulfate in the amount of bastnaesite during the roasting process as a roasting aid, leaching with hydrochloric acid at 80°C for 0.5h, and leaching in hydrochloric acid During the process, lanthanum sulfate with an amount of 5 wt% of bastnaesite is added as a catalytic leaching aid to obtain a cerium-poor rare earth chloride solution and fluorine-containing cerium-rich slag. The leaching rate of rare earth reached 70.8%, among which the leaching rate of non-cerium rare earth in bastnaesite reached 98.4%. CeO in fluorine-containing cerium-rich slag 2 / TREO reached over 97.1%. The fluorine-containing cerium-rich slag undergoes a flotation process to obtain rare earth fluorides with a purity of 96.3%, of which CeO 2 / TREO is greater than 98%. The total yield of rare earths entering rare earth fluorides and rare earth chlorides reaches 98.8%. The aluminum introduced by the roasting aid can be...
Embodiment 3
[0038] The bastnaesite was oxidized and roasted at 450°C for 2.5h. During the roasting process, 1% by weight of bastnaesite was added as a roasting aid. It was leached with hydrochloric acid at 50°C for 5h. During the leaching process with hydrochloric acid 2wt% aluminum nitrate in the amount of bastnaesite is added as a catalytic leaching aid to obtain a cerium-poor rare earth chloride solution and fluorine-containing cerium-rich slag. The rare earth leaching rate reached 73.1%, and the non-cerium rare earth leaching rate in bastnaesite reached 99.1%. CeO in fluorine-containing cerium-rich slag 2 / TREO reached 98.7%. Fluorine-containing cerium-rich slag undergoes a magnetic separation process to obtain rare earth fluorides with a purity of 95.3%, of which CeO 2 / TREO is greater than 98%. The total yield of rare earths entering the rare earth fluorides and rare earth chlorides reaches over 99.2%. Non-rare earth elements such as sodium and aluminum introduced by roasting ai...
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