Extraction of aluminium as aluminium sulphate from thermal power plant fly ashes
| Autor: | Chitta Ranjan Panda, Seoul Sangita, Niva Nayak |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Materials science Metallurgy Metals and Alloys chemistry.chemical_element 02 engineering and technology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Bayer process 020501 mining & metallurgy law.invention 0205 materials engineering chemistry Aluminium law Fly ash Materials Chemistry Leaching (metallurgy) Particle size Crystallization Fourier transform infrared spectroscopy Nuclear chemistry |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 27:2082-2089 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(17)60231-0 |
| Popis: | Valuable metal extraction technology from thermal power plant fly ash is limited. In the present study, aluminium is extracted from fly ash as highly pure aluminium sulphate (>99.0%) by leaching with sulphuric acid, followed by pre-concentration and successive crystallization. Two types of fly ashes from different sources, i.e., Talcher Thermal Power Station (TTPS) and Vedanta Aluminium Company Limited (VAL) were chosen for comparative study on the extraction of aluminium as aluminium sulphate. The product is characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Purity of aluminium sulphate was also investigated by inductively coupled plasma–optical emission spectrometry (ICP–OES). The extraction efficiency of aluminium depends on the varied solid-to-liquid ratio (fly ash : 18 mol/L H 2 SO 4 , g/mL) and particle size of fly ashes. Physico-chemical analysis indicates that the obtained product is Al 2 (SO 4 ) 3 ·18H 2 O, having low iron content (0.08%). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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