Dissertation > Excellent graduate degree dissertation topics show

Silica fume wet purified preparation of spherical nano-silica

Author: YangZhenWei
Tutor: MaWenHui
School: Kunming University of Science and Technology
Course: Non-ferrous metallurgy
Keywords: Silica fume Eliminating impurities Spherical Nano-silica Wet method
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
Read: Download Dissertation


The application of Nano-silica in all kinds of fields is getting sophisticated. As the range of use is expanding, the shortage of the Nano-silica has become a problem. The spectrum of material used in the conventional preparation technology is very narrow, so that many researchers devote their time in finding new materials. Silica fume, which is discarded in the extraction process of industrial grade silicon and silicon steel, is used as a new material to produce silica in this paper. The practice is a successful exploration in recycling secondary sources and finding a new way to produce silica.The process flow is depicted as follow. Silica fume is first baked to eliminate carbon under 550℃and heat insulation for 5h, and then silica fume is put into HCl solution to get rid of some other impurities and to change surface properties of the particles, while silica fume settles to the bottom because of gravitation. Separate the particles and the fluid. The particles are further washed in HF solution to dissolve the glass outer casing which is generated while silica fume is produced. Then the particles after washing are delivered to alternant acid leaching in HCl and H2SO4 solutions, which is the body part of the experiment. In the end, dry the leached residue to produce samples.Dictation technologies, such as XRD, XRF, SEM and ICP, are used to research the microscopic structure and phase component of material and products, as well as the purification of the products and the mechanism of eliminating impurities.As how purification of silica fume arc affected by factors, such as temperature, reaction time, concentration of solutions and stirring rate, are systematically discussed in the paper, the best experiment scheme is developed according to efficiency of purification and practicable conditions. The optimal condition is 60℃,600r/min stirring rate,2h reaction time and liquid-solid ratio is 50:1.Nano-silica of high purity is produced through acid leaching, while the nanometer grade size of silica fume is reserved and most of the impurities are removed. The remove rate of impurities is Fe:63.1%, Al:55.3%, Ca:88.2, Mg: 84.4%, K:82.5%, P:93.06% respectively. Spherical Nano silica of 98.3% is gained ultimately. SiO2 is increased by 5.22% than raw material.

Related Dissertations

  1. Study on the Resource Utilization and Adsorbability of Silica Fume,X703
  2. Silica fume industry market analysis and Aiken ( China ) Company Marketing Strategy,F426.71
  3. Research of Silicon Powder Fluidization in Fluidized Bed,TQ127.2
  4. Test Research on the Mechanical and Fracture Property of HPC,TU528
  5. Experimental Study on Durability for the High Performance Concretre,TU528
  6. Concrete Microwave Promote with Fixed Attention Experimental Study,TU528
  7. Studies on Preparation Process and Stability of Acid Silica SOL from Microsilica,TQ127.2
  8. Investigation on Effect of Al, Si and SiO2 on Property of Alumina-zirconia-carbon Slide Plate Refractories,TQ175.14
  9. Research on Application Technique of High Performance Concrete in High Cold and Strong Erode Region,TU528
  10. Study on Mine High-Performance Polymer Modified Concrete,TU528
  11. Study on the Influence of Strength and Durability of Concrete Owing to Different Qualities of Silica-fume,TU528.33
  12. Study on Cracking Resistance of Hydraulic Abrasion-resistant Concrete,TV431
  13. Study on Performance of Alkali-activated Flyash-based Geopolymer Reinforced by Organic Resin,TU528
  14. The Comparison between Normal Wet Method and Jet Bubbling FGD Technology,X701.3
  15. Research on the Performances of Ultra-fine Cement Crack Repair Material Modified by Silica Fume,TU528
  16. Study on the Properties of Cement Hydration Using Electrical Resistivity Method,TU528
  17. Study on RBSN-SiC Ceramics with the Preparation of Retrieve Cut Metal Silico-Spindle Wire,TQ174.1
  18. Research on Preparation and Mechanisms of Super High Strength Concrete,TU528
  19. Optimizing Process of Porous Silicon Powder by Chemical Etching Method and Its Explosive Performance Evaluation,TQ560.1
  20. Experimental Study of 120MPa new ultra high strength cement-based materials,TU525

CLC: > Industrial Technology > Chemical Industry > Non-metallic elements and their inorganic compounds, the chemical industry > Part Ⅳ family of non-metallic element and its inorganic compounds > Silicon and its inorganic compounds
© 2012 www.DissertationTopic.Net  Mobile