Dissertation > Excellent graduate degree dissertation topics show

Research of Solvent-extraction Process and Emulsified Materials in Recovering Vanadium from Acid Leachate of Stone Coal

Author: WangYi
Tutor: ZhangYiMin
School: Wuhan University of Science and Technology
Course: Mineral Processing Engineering
Keywords: vanadium stone coal acid infusion extraction emulsification
CLC: TF841.3
Type: Master's thesis
Year: 2013
Downloads: 45
Quote: 0
Read: Download Dissertation

Abstract


At present, the blank-roasting acid-leaching process for stone coal is widely used inindustry due to eco-friendly and high efficiency characters. Vanadium is released into theleachate from micas through acid leaching. However, the concentration of vanadium is too lowand there are so many impurities owing to the weak selectivity of acid. Therefore, it is necessaryto purify and enrich the leachate.This thesis investigated the parameters of solvent extraction vanadium for the leachate frommicas-bearing stone coal, analyzed the reasons for the formation of emulsified materials duringthe extraction procedure and gave the solutions.The optimal parameter of solvent extraction is aqueous pH value of2.0, the organic of20%（v/v）P204:5%（v/v） TBP:75%（v/v） sulfonated kerosene, O/A phase ratio of （v/v）1/3andextraction time of8min.5-stage extraction efficiency was99%. The optimal tripping parameterwas H2SO4concentration of8%（v/v）, O/A phase ratio of （v/v）10/1and stripping time of10min.8-stage stripping efficiency was99%.Research for emulsified materials indicated that solid particles were formed from sulfate,silicic acid and hydrolysate from metallic ions in aqueous phase during solvent extraction.Meanwhile, there were surface-active impurities and degradation products in organic phase.Liquid droplets with surface-active impurities absorbed the solid particles. The droplets excludedeach other in aqueous phase and were difficult to get together, which stabilized the emulsifiedmaterials. Additionally, interfacial solid film was formed between the liquid droplets with solidparticles to improve the stability of emulsified materials. The following measures can be taken inorder to extract vanadium from the leachate normally:（1） decline the solid substances in aqueousphase and the surface-active substances in organic phase;（2） increase the content of TBP toimprove the polarity of extraction agent;（3） decrease the colloidal materials in aqueous.

Related Dissertations

  1. Research on Automatic Detection Algorithm for Substructure Distress of Highway Pavement Based on SVM,U418.6
  2. ISAR Imaging Simulation of Space Targets and Target Recognition Based on ISAR Images,TN957.52
  3. Research of Question Answering System Based on the Analysis of Lexical and Semantic Meanings,TP391.1
  4. Research on Feature Extraction and Classification of Pulse Waveform for Cholecystitis and Nephrotic Syndrome Diagnosis,TP391.41
  5. Application of Q-Learning in the Content-Based Image Retrieval Technology,TP391.41
  6. Answer Extraction Based on Logic Representation and Reasoning for Reading Comprehension,TP391.1
  7. Research on Domain Entity Attribute and Event Extraction Technology,TP391.1
  8. Research on Transductive Support Vector Machine and Its Application in Image Retrieval,TP391.41
  9. Research on Feature Extraction and Classification of Tongue Shape and Tooth-Marked Tongue in TCM Tongue Diagnosis,TP391.41
  10. Research on Temporal Information Recognition and Normalization,TP391.1
  11. Context-Dependent Lexical Paraphrasing,TP391.1
  12. Research on Extraction and Tracking of People’s Opinion,TP391.1
  13. The Study of Domain Dictionary Construction Based on Web,TP391.1
  14. Research on Visual Measurement for Spacecraft Rendezvous and Approach,TP391.41
  15. Research on the Image Real-Time Acquisition, Storage and Image Processing System,TP391.41
  16. Feature Extraction, Selection and Combination in Lipreading,TP391.41
  17. Multi-currency Notes Technology Research and Implementation,TP391.41
  18. The Research on Paper Currency Classification Method Based on Harr-Like Feature and Minimal Ball Including Samples,TP391.41
  19. Pavement Distress Recognition Based on Image,TP391.41
  20. Research on Visual Detection and Tracking of Mobile Robots,TP242.62
  21. Research on Fusion Algorithm of Hyper Spectral and High Spatial Resolution Remote Sensing Image,TP751

CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Rare metal smelting > Refractory metals smelting ( high - temperature molten metal ) > Vanadium
© 2012 www.DissertationTopic.Net  Mobile