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자료유형
학술저널
저자정보
이광희 (인하대학교) 유병돈 (인하대학교)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.5
발행연도
2017.1
수록면
1,029 - 1,036 (8page)

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Low pressure materials pre-treatment process has been developed as an alternative to the existing high-temperaturesludge drying, limestone calcination, and limonite dehydroxylation. Using the thermodynamic equilibriumrelationship between temperature and pressure represented by the Clausius-Clapeyron equation, the operationaltemperature of these reactions could be lowered at reduced pressure for increased energy efficiency. For industrialsludge drying, the evaporation rate was controlled by interfacial kinetics showing a constant rate with time and significantacceleration in the reaction could be observed with reduced pressure. At this modified reaction rate underlow pressure, the rate was also partially controlled by mass transfer. Temperature of limestone calcination waslowered, but the reaction was limited at the calculated equilibrium temperature of the Clausius-Clapeyron equationand slightly higher temperatures were required. The energy consumption during limestone calcination andlimonite dehydroxylation were evaluated, where lower processing pressures could enhance the energy efficiencyfor limestone calcination, but limonite dehydroxylation could not achieve energy-savings due to the greater powerconsumption of the vacuum pump under lower pressure and reduced temperatures.

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