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An Investigation on REEs' Cerium, Lanthanum, Neodymium Leaching from Phosphate Concentrate of Iron ore Waste in Hydrochloric Acid Environment and Study on Purification and Concentration of the Solution

Sadrolfozalaei, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50272 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Youzbashizadeh, Hossein
  7. Abstract:
  8. Considering the demand for electronic and other products that rare earth elements are one of the necessary materials for their production, recovery of these elements plays an important roll today.The term “rare earth”, represents a group of 17 metalic elements with similar physical and chemical properties such as Sc,Y and lanthanides. Lanthanides are a group of elements with 57 to 71 atomic numbers and all of them except Pr, are present in earth crust.Some of these elements are available in phosphate concentrate(iron ore waste) of chadormalu in bafgh. Base on the analysis performed on apatite concatrate, it was represented that Ce,La and Nd elements are more than the others. So this research just focused on extracting these 3 elements.In this research, phosphate concentrate of chadormalu was leached with HCl. Design expert software was used for design tests with changing tempreture, L/S, acid concentration and time parameters, and then based on ICP analysis of solution, the optimum conditions of leaching tests was found as follow: 3M acid concentration, L/S ratio 15, temperature 90℃ and in 18 minutes, that recovery was achieved 65-70 percent.After the selective leach liquor was found, with solvent extraction method(SX) and using D2EHPA as extractant, recovery extraction achieved 80-85 percent of these elements from leach liquor. The optimum conditions were found as follow: 0.5M extractant concentration, pH 1.1, o/a 2.5 and 40℃
  9. Keywords:
  10. Rare Earth Element ; Chloride Leaching ; Design Expert Software ; Solvent Extraction ; Diethyl Hexyl Phosphoric Acid (DEHPA) ; Phosphate Concentrate

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