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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 52238 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Askari, Masoud
- Abstract:
- In Iran, titanium dioxide is still not produced and imports of titanium dioxide are required by various industries, including dyeing, electrodeposition, plastics and Therefore, according to the Ministry of Industries and Mines objectives, to obtain the technology of extraction Ti and TiO2, a research was carried out on titanomagnetite concentrate, extracted from the minerals of the plancher titanumitent and low-grade kahnoj. In this research, titanium dioxide is produced by sulfate method. Solid state recovery and magnetic separation were used to isolate titanium and iron. The dissolution process was then performed to achieve maximum dissolution. At this stage, the effects of temperature, time, acid concentration and solid to solution solubility were investigated. Using the design principles of the experiment, the dissolution process was optimized. The results of this study showed that the solution of sulfate for a concentrate with a purity of less than 20% can be used and by reducing the stages of the production process (removal of the slag phase), together with the optimization of the process Production and maximum dissolution of titanium. The results of the solvent stage proved that in the optimal conditions of dissolution (150 ° C = temperature, molar 11 = acid concentration, 2 hours = time and 30 g per liter = solid to liquid ratio), the experimental level of titanium dissolution reached 89.73%. Also, the effect of different parameters on the dissolution rate indicated the high effect of temperature on the dissolution rate. At the iron refining stage of the dissolved solution, the results indicated that removal of 96.72% iron from the solution was carried out using ammonia at pH 3 and a 90 minute deposition time, which was considered as an optimal refining condition for iron reported. In the stage of hydrolysis and precipitation of titanium hydrate, the effect of pH, temperature and time on the amount and quality of sediment was investigated. Optimum this stage, despite the maximum amount of sedimentation, was 79.81%
- Keywords:
- Titanium Dioxide ; Dissolution ; Titanumagnetite ; Sulfate Process ; Titanium Dioxide ; Solid State Reduction
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