본 연구에서는 국내 석탄회의 재활용을 목적으로 석탄회 중 미연 탄소분을 분리 제거하는 방법으로서, 탄소분과 회분의 표면화학 특성 차이를 이용하여 분리하는 방법인 부선법에 의한 미연탄소 분리특성 및 분리효율에 미치는 영향인자들에 관해 검토하였다. 먼저 석탄회의 종류별 분리특성을 조사하였고, 강알칼리성 석탄회의 분리효율을 향상시키기 위해 광객 pH의 조정, 계면활성제 첨가 및 등유 투입량을 변화시켜 부선 실험을 행하였다. 그 결과 pH 7의 중성영역에서 탄소분 분리효율이 가장 높은 것을 알 수 있었고, 적장량의 게면활성제 첨가는 분리효율 향상에 효과적인 것을 발견할 수 있었다. 또한 본 부선 실험에 사용한 컬럼 부선법으로 pH조정 및 적정량의 계면활성제 첨가 등에 의한 적정 부선 조건에서 미연탄소 함량 2% 이하, 수율 80% 이상의 정제회를 얻을 수 있었고, 따라서 부선 정제된 석탄회의 재활용이 가능할 것으로 사료된다.

In this study, as a removal method of unburned carbon from fly ash for the purpose of recycling, the characteristics of separation and the effect parameters on separate efficiency were investigated by the flotation method, making use of the difference between the surface chemistry of carbon and that of ash. The separation charactieristics were investigated according to fly ash type, and then the flotation experiments were done to increase the separation efficiency by the pH adjustment of pulp, the addition of surfantants and the change of kerosene amount. As a result, the separation efficiency by the pH was highest ar neutral region, pH 7 and the addition of moderate amount of surfactant to kerosene was so effective to increase it. Moreover, the column flotation method produced the refined fly ash containing unburned carbon contents under 2% and yield over 80% at the optimum flotation condition made by a pH adjustment, the addition of moderate amount of surfactant etc. Therefore, it is expected that the recycling of the refined fly ash is possible.

Column Flotation Fly Ash Removal of Unburned Carbon Separation Characteristics

Oh DG, Lee JS, Chun BH, J. Korean Solid Wastes Eng. Soc., 10(2), 145 (1993)
Harada M, Shigen-to-Sozai, 107(2), 147 (1991)
Shin BS, Lee SO, Kook NP, Lee HY, The 2nd Int. Sym. on East Asian Resources Recycling Tech. Ed. Oh, J., The Korean Institute of Resources Recycling (Seoul), 154 (1993)
Peng GW, Wen SB, The 2nd Int. Sym. on East Asian Resources Recycling Tech. Ed. Oh, J., The Korean Institute of Resources Recycling (Seoul), 168 (1993)
Mehrotra VP, Sasty KVS, Morey BW, Int. J. Miner. Process., 11, 175 (1983) 
Liu D, Somasundaran P, Int. J. Miner. Process., 41(3), 227 (1994) 
Nozawa M, Suzuki M, Matsuoka I, Shigen-to-Sozai, 112(2), 99 (1996)
Dobby GS, Finch JA, CIM Bull., 79(889), 89 (1986)
ManKosa MJ, Adel GT, Luttrell GH, Yoon RH, Proceedings, The Mathematical Modeling of Metals Processing Operations, Extractive and Process Metallurgy Fall Meeting, AIME, Palm Springs, CA, Nov. 28-Dec. 2 (1987)
Rice RG, Oliver AD, Newman JP, Wiles RJ, Powder Technol., 10, 201 (1974) 
Yoon RH, Luttrell GH, Proceedings, 2nd Int. Conf. on Processing and Utilization of High Sulfur Coals, Carbondale, III, Sept. 27-Oct. 1 (1987)
Moon KS, CANMET Division Report ERP/MSL 82-55(IR), 22, March (1982)
Nozawa M, Tohji K, Matsuoka I, Shigen-to-Sozai, 109(2), 95 (1993)
Nozawa M, Tohji K, Matsuoka I, Shigen-to-Sozai, 110(2), 131 (1993)
Li C, Somasundaran P, J. Colloid Interface Sci., 146, 215 (1991)