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Leaching of Hydrometallurgical Treatment Residue of Zinc Concentrate and Indium Solvent Extraction of Solution

Maddah, Fereydoon | 2019

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 57462 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashizadeh, Hossein
  7. Abstract:
  8. The foregoing note is a Ph.D. Thesis in Material Science and Engineering entitled "Leaching of hydrometallurgical treatment residue of zinc concentrate and Indium solvent extraction of solution". This research includes three stages of Roasting, Leaching, and solvent extraction. The scientific fundamentals and research background in all three domains have been studied. Investigations on the Roasting of zinc sulfide concentrate showed that in order to prevent the ingestion of indium into the zinc ferrit structure, the alkaline roasting process with 15% calcium oxide at 850 0C and 150 min prevented the ingression of 80% of the indium into the ferritic structure. The results of studies on the dissolution of indium have shown that with the aid of RedOx Leaching of combination of 80% Zinc Leaching Residue containing Zinc Ferrite and 20% sphalerite concentrates with 85% sulfuric acid-15% oxalic acid, the amount of indium can be solubilised. The results obtained from studies on the Solvent Eextraction of indium indicate that the Enthalpy of the indium extraction reaction by the D2EHPA+TBP Synergistic Extractant is 2.88 KJ/mole, Which indicates the reaction is Endothermic, and With increasing temperature, the amount of indium extraction in this temperature range will increase. Other thermodynamic parameters are also determined. The lower value of enthalpy has evidence of the low effect of temperature variations on the thermodynamics of the indium solvent extraction process. Also, the enthalpy of the iron extraction reaction by the D2EHPA+TBP Synergistic Extractant is 34.21KJ/mole, Which indicates the reaction is Endothermic, and With increasing temperature, the amount of iron extraction in this temperature range will increase. The relatively higher value of the iron extraction enthalpy from the indium extraction enthalpy indicated that the significant effect of temperature variations on the thermodynamics of the iron extraction process. With the aim of optimizing the SX process variables in order to maximize the indium extraction and separation of indium from iron, the temperature of 32.5 0C, pH of 0.25, the extractant concentration of 18.32%, and the sulfate ion concentration of 20 gr/lit, are proposed as optimum conditions
  9. Keywords:
  10. Indium Compounds ; Zinc Ferrite ; Roasting ; Solvent Extraction ; Leaching ; Hydrometallurgical Zink Residues ; Neutral Leaching Residue

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