| 정재헌1 · 이소영1 · 최 주2 · 손호상1,* |
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| 유가금속 회수를 위한 고로 슬러지의 분산 거동 |
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Received: 21 January 2021; Accepted: 9 March 2021. Published online: 6 April 2021. |
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| ABSTRACT |
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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. |
| Keywords:
blast furnace, sludge, recycling, zeta potential, pH, dispersant |
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