Dispersion Behavior of Blast Furnace Sludge for Valuable Metal Recovery
| Autor: | Joo Choi, Ho-Sang Sohn, Jae-Heon Jung, So-Yeong Lee |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Blast furnace
Materials science 020502 materials Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Dispersant Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal 0205 materials engineering Chemical engineering Modeling and Simulation visual_art Zeta potential visual_art.visual_art_medium 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Korean Journal of Metals and Materials. 59:295-303 |
| ISSN: | 2288-8241 1738-8228 |
| Popis: | Blast furnace sludge, which comes from the iron making process, contains many valuable materials including iron, carbon, and zinc, etc. Because a cohesive agent is added during filtration, fine sludge particles are agglomerated together. Therefore, This makes it necessary to disperse the sludge in solution before separating or recovering valuable materials. In this study, the effects of solid/liquid (g/L) ratio, ultrasonic dispersion conditions, the pH of solvent, and the concentration of dispersant on the dispersion of sludge were investigated by measuring the interfacial properties (zeta potential and hydrodynamic size) of sludge particles. High absolute value of zeta potential and small hydrodynamic size suggests that the sludge particles in the solution presents good dispersion. The absolute value of zeta potential increased gradually at high solid/liquid ratio and ultrasonic dispersion intensity. But when the sludge in solution was dispersed for more than 30 minutes, the absolute value of the zeta potential decreased due to increasing contact and interaction between the particles. Optimal dispersion operations were conducted and when the pH of the solution was adjusted to 11, the zeta potential value was measured to be -44.8 mV. This means that the sludge formed the most stable dispersed phase. The lowest zeta potential was measured to be -46.4 mV with the addition of sodium hexametaphosphate (NaPO3)6 in the solution. It is thought that the sodium hexametaphosphate reduced ionic strength by removing alkali metal ions from the solution of sludge. |
| Databáze: | OpenAIRE |
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