an Investigation on REEs' Cerium, Lanthanum, Neodymium leaching from Phosphate Concentrate of Iron Ore Waste in Acidic Environment and Studing Purification and Concentration of the Solution

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Aghaeian, Soroush | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49579 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Yoozbashizadeh, Hossein
Abstract:
The term “Rare Earth”, represents 17 metalic elements such as Sc, Y and Lanthanides wich have similar chemical properties. Lanthanides are a group of elements with atomic numbers of 57 to 71 that all of them exept Pm are present in nature. Rare earth elements are never concentrated in a special mine rock, but they could be found in various rocks and at very low concentrations. In the present study, apatite concentrate of Chadormalu was used for leaching and solvent extraction of Cerium, Lanthanum and Neodymium. After leaching step, its optimum conditions were found as follow: 30% nitric acid, 10 mins time and 10% for solid to liquid ratio. After finding optimum conditions, sufficient leach liquor with this condition was prepared for solvent extraction step. Best condition for solvent extraction was also as follow: 20% extractant (D2EHPA) concentration, pH=1.2 and organic phase to aqueous phase ratio of 3. So a novel method for extraction of rare earths from Chadormalu apatite concentrate was developed
Keywords:
Nitric Acid ; Solvent Extraction ; Leaching ; Rare Earth Element ; Diethyl Hexyl Phosphoric Acid (DEHPA) ; Lanthanum ; Cerium

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