Dissertation > Excellent graduate degree dissertation topics show

Solvent Extraction of Zinc from Zn （Ⅱ）-NH3 Complex System by New Extractant

Author: HuangLing
Tutor: HeJing
School: Central South University
Course: Non-ferrous metallurgy
Keywords: zinc oxide ore solvent extraction ammonia leaching zinc 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester
CLC: TF813
Type: Master's thesis
Year: 2011
Downloads: 83
Quote: 0
Read: Download Dissertation

Abstract


The extraction of zinc from ammonia leaching solution is hard to carry out because of the low concentration of zinc ion in ammoniacal leaching solution in low grade of zinc oxide ores. A new synthesized organic compound,2-acetyl-3-oxo-dithiobutyric acid-myristyl ester, can extract and enrich zinc from zinc-ammonia solution efficiently. A research subject of "solvent extraction of zinc from Zn(II)-NH3 complex system by new extractant" was proposed. In this paper, extraction mechanism, technological conditions and kinetic parameter were studied, and some academic vale results were obtained. The results indicated that this research subject has a broad prospect in industrial application.Extraction mechanism of zinc extraction by 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester from ammonia solution was studied. The extraction saturation capacity of zinc by this new extractant was 76.4mmol/dm3. Then, the composition of extracted complex and extraction reaction were obtained. The study suggested that the extractant 2-acetyl-3-oxo-dithiobutyric acid-myristyl ester hasβ-diketone structure and is easy tautomeric change to enolform; then ion H+ of hydroxy can exchange with metal ion Men+and they form complexes.The kinetics of zinc extraction by this new extractant in NH4+-NH3-H2O system was carried out by method of invariable interface. All Kinetics studies showed that by using this new extractant to extract zinc, the extraction rate was depended on the mixed-controlled reaction rate, and the solvent extraction reaction rate can be depicted as The apparent activation energy of this extraction reaction is measure as 28206kJ/mol, which consistence that the extraction reaction is controlled by mixed-controlled reaction rate.During the extraction process test, the effects of different ammonia complex systems, composition of organic phase and aqueous phase, temperature and phase ratio of zinc extraction were investigated respectively. The results show that the average extraction ratio of zinc is larger than 97% and the distribution ratio of zinc can reach 112.6 under the following optimum conditions:organic phase composition 50%YORS+45%H (diluent)+5%P (additibe), phase ratio V(A)/V(O)=2:1, temperature 298.15 K, agitation time 5 min, total ammonium concentration 2 mol/L, initial pH value 9-11. TheΔHθof extraction reaction is 6.09 kJ/mol, so extraction process is an endothermic reaction.

Related Dissertations

  1. Research on Geological Features of Yinchanggou-Qiluogou Lead-Zinc Ore Deposit, Ningnan County, Sichuan Province,P618.4
  2. Optimization Design Andapplication of Extracting Methods of Maize (Zea Mays L.) Volatile Compounds,S513
  3. Anti-corrosion Property of Flake Zinc Epoxy Coating Doped with Rare Earth in SRB,TQ630.1
  4. Effects of Different Applying Methods of Copper and Zinc and AM Fungi under Different P-Applied Levels on Growth and Tanshinones of Salviae Miltiorrhizae Bunge,S567.53
  5. Effects of Copper, Zinc and Selenium on Yield and Quality of Chrysanthemum Morifolium Ramat,S567.239
  6. Cloning and Characterization of Five Zinc-finger Proteins (ZFPs) Related with Stresses in Cotton (Gossypium Hirsutum L.),S562
  7. The Effect of High-level Copper and Zinc Addition on the Performance, Digestibilities and Gastrointestinal Enzyme Activities of Weaned Piglets,S828.5
  8. Preparation and Photocatalytic Properties of Semiconductor Oxides,O643.36
  9. Study on the in Vitro Effect of Zinc on the Growth of Murine Embryonic Palatal,R782.2
  10. Northwest Geological two lead and zinc in the river Construction of QHSE management system,X936;X322
  11. Inorganic and inorganic - organic hybrid Zn -based catalysts and catalytic L- lactide ring-opening polymerization of L- polylactic acid applied research,O631.3
  12. Core-shell polymer microspheres synthesis, modification and application,O631.3
  13. MWCNTs and ZnO / SnO 2 Composites and NO gas research,TB33
  14. The Correlation of Serum ZAG with Insulin Resistance in Type 2 Diabetes,R587.1
  15. Initial Exploration of ZNFD Biological Functions and ZBTB9 Cloning and Expression of Mouse Zinc Finger Protein,Q78
  16. Progress of Research on the Visible Luminescence Mechanism of ZnO,O472.3
  17. Preparation and Properties of ZnO-based Diluted Magnetic Semiconductors,TN304.21
  18. Investigation into ZnO Thin Film Transistors Prepared by Sol-gel Method,TN321.5
  19. Study on the Role of Osterix in the Heterotopic Ossification of Fluoride Bone Injury,R114
  20. High Level of Zinc Intake Causes AD-like Pathologic Changes and Memory Impairment,R749.16
  21. Effects of Foliar Zinc Application on Cadmium and Zinc Accumulation of Rice Grown in Cadmium Contaminated Soil,S511

CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Heavy metals smelting > Zinc
© 2012 www.DissertationTopic.Net  Mobile