A novel process for preparation of titanium dioxide from Ti-bearing electric furnace slag: NH4HF2-HF leaching and hydrolyzing process
| Autor: | Guanzhou Qiu, Feng Chen, Zheng Fuqiang, Yang Lingzhi, Yufeng Guo, Yu-lei Sui, Tao Jiang, Shuai Wang |
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| Rok vydání: | 2018 |
| Předmět: |
Anatase
Environmental Engineering Materials science Health Toxicology and Mutagenesis Inorganic chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Pollution 020501 mining & metallurgy law.invention Ion chemistry.chemical_compound Hydrolysis 0205 materials engineering chemistry law Rutile Titanium dioxide Environmental Chemistry Calcination Leaching (metallurgy) 0210 nano-technology Waste Management and Disposal Roasting |
| Zdroj: | Journal of Hazardous Materials. 344:490-498 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2017.10.042 |
| Popis: | A novel process to prepare titanium dioxide from Ti-bearing electric furnace slag by NH4HF2-HF leaching and hydrolyzing process has been developed. In this present study, the effects of [NH4+]/[F] mXolar ratio, leaching temperature, [F] concentration, liquid/solid mass ratio, leaching time on the Ti extraction, and the phase transformations have been investigated to reveal the leaching mechanism of Ti-bearing electric furnace slag in NH4HF2-HF solution. In the NH4HF2-HF leaching process, the MgTi2O5 and Al2TiO5 are converted to TiF62− and Mg-Al-bearing precipitate. Ti extraction rate reached 98.84% under the optimal conditions. In addition, 98.25% iron ions can be removed in the presence of NaCl prior to hydrolysis process. The effects of pH and temperature on the selective hydrolysis of TiF62− during hydrolysis process were also studied. In the hydrolysis process, the TiF62− is converted to (NH4)2TiOF4. By calcination, high grade TiO2 powder with its purity of 99.88% was obtained, using which the products, well crystallized anatase and rutile, were obtained through roasting at 800 °C and 1000 °C, respectively. |
| Databáze: | OpenAIRE |
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