Dissertation > Excellent graduate degree dissertation topics show

Preparation of Mn-Zn Soft Ferrite from Potassium Jarosite’s Slag

Author: WeiJiYe
Tutor: HouXinGang
School: Lanzhou University of Technology
Course: Non-ferrous metallurgy
Keywords: jarosite residues leaching purification co-precipitation Mn-Zn ferrite magnetic properties
CLC: TM277
Type: Master's thesis
Year: 2012
Downloads: 46
Quote: 0
Read: Download Dissertation

Abstract


To realize economic sustainable development goals, It must always pay attentionto deal with the relationship of the economic development and population, resources,environment. Mn-Zn ferrites powders were synthesized by co-precipitation methodusing jarosite residues of the Northwest Zinc Leaching Factory as materials. Mn-Znferrite is the key materials of modern electronic industry and information indus-try.With the rapid development of telecommunication and computer technology,Mn-Zn ferrite is required for mass production. If high quality soft magnetic ferritepowders can be prepared from jarosite residues, the waste slag recycling process,having great benefits to society and the economy, will be an environmentallyacceptable technology. MnZn soft magnetic ferrite powders which were preparedthrough the process of hot-acid leaching, reducing, purification and co-precipitation byjarosite residues as materials, finally were made into the soft MnZn ferrite, as well asCo doping process. The following researches have been carried out:Using the jarosite residues as raw material, by thermal acid leaching process, ironpowder reduction process, sulfurration precipitation process and fluorinationprecipitation process, to prepara with main body MeSO4solution of the iron and zincelements, In the whole process Fe and Zn leaching rate of up to90%, the removal rateof Cu, Cd, Ca, Mg up to99%、98%、92%and89%, reached the experimentalrequirements.It is can be conclused from the above prepared MeSO4solution which is same astheory propotion, and from co-precipitation experiment with NH4HCO3precipitationagent: filling pure material rate is low （don’t consider manganese）, the metal ions inpure rate is1%, average fill pure rate is only0.36%, and total precipitationcomprehensive experiments show that, three kinds of main body of iron Zn2+, Mn2+and Fe2+precipitation rate is higher, sink points of main component ratio of manganesezinc ferrite accord with the actual ratio of theory, the relative error value are controlledin degree is within±5%around.Made the preparation of heavy ferrite powder into the final product through theMnZn ferrites process, experimental results showed that the density of the embryos,the pre-sintering temperature, sintering temperature, holding time sintering processwill be effect to microscopic structure of Mn-Zn ferrite, starting the microstructure ofthe magnetic conductivity and other magnetic properties. Finally, the determinedsintering process conditions is: the pre-sintering temperature is950℃, the density ofthe embryos is3.2g/cm3, sintering temperature is1220℃, holding time for2h, Co doping is1.5%and in this conditions the products magnetized strength reach to58emu/g, the initial magnetic conductance to3632, coercive force to21.79Oe.

Related Dissertations

  1. Study on Protective Effects of Apple Polyphenol on Immune System Injury Caused by γ-Ray,S661.1
  2. Study on Wastewater Purification Effect of the Free Surface Wetland with Different Substrates and Plant Combination,X703
  3. Penicillium Expansum TS414 Lipase in Pichia Pastori: Expression, Purification and Enantioselective Esterification of (R, S)-naproxen,Q814
  4. Studies on Fermentation Optimization, Purification and Enzyme Characteristics of Lipase from Aspergillus Oryzae FS-1,TQ925.6
  5. Studies on Isolation, Purification and Chemical Structure for Polysaccharides from Camellia Chrysantha(Hu) Tuyama,S567.19
  6. Research of Glycosaminoglycan from Perna Virids Effect on Blood Lipid,R285.5
  7. Purification of Endogenous Proteases from (Litopenaeus Vannamei) Shrimp Head and Their Enzymology Properties,S985.21
  8. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  9. Study on the Preparation of the Low Molecular Weight Fuciodan from Sargassum Henslowianum (C.Agardh) and Anti-tumor Activity,TS254.9
  10. Under microaerobic conditions closed calcium carbide furnace exhaust COS gas adsorption purification,X781
  11. Studies on Extraction and Analysis of Fructooligosaccharides in Smallanthus Sonchifolius,TS255.1
  12. New Technology and Basic Study on the Direet Preparation of PbO Powder from Galena by Selective Leaching Technology,TQ134.33
  13. Experiment Study of the Biogas Purification Process by Zeolite Filling Washing,TQ221.11
  14. Optimization of Fermentation Conditions, Purification, Cloning and Expression of a Cold-active Lipase from Pseudomonas Sp.RT-1,TQ925
  15. Extraction, Purification and Antifungal Activity of Anthocyanins in Drop Fruits of Chinese Baberry,TQ914.1
  16. Recovery Sulphur from Zinc Concentrate of Pressure Acid Leaching Residue,X751
  17. Accumulation and Leaching Risk of Phosphorus in Vegetable Soils under Intensive Cultivation,S63
  18. The Study of TWC Catalytic Removal NOx from Waste Incineration Flue Gas,O643.36
  19. The Research of Tea Seed Polysaccharide from Cold Squeeze Leaching Camellia Cake,TS229
  20. 1,3 - propanediamine shrink o-vanillin 3d-4f heteronuclear bimetallic complexes synthesis, structure and properties of,O627.3
  21. Dissolution of Copper from Waste Printed Circuit Boards,X76

CLC: > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Ferrite,oxide magnetic materials
© 2012 www.DissertationTopic.Net  Mobile