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염화알미늄수화물의 부분열분해에 의한 PAC(Polyaluminum Chloride) 응집제 제조

Manufacture of PAC(Polyaluminum Chloride) by Partial Decomposition of Aluminum Chloride Hexahydrate

박균형 이규철 김진권

Park KY Lee K Kim J

HWAHAK KONGHAK, October 1994, 32(5), 742-746(5), NONE

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Abstract

염화알미늄수화물(AlCl₃. 6H₂O)을 180℃에서 부분 열분해시켜 고체상태의 염기성 염화알미늄[Al(OH)_xCl_3-x]을 얻은 후 이것을 물에 용해시켜 수처리 응집제로 사용되는 새로운 PAC(polyaluminum chloride)제조 방법을 제시하였다. 분해율의 변화에 따른 염기성 염화알미늄 및 PAC용액의 특성을 분석하였다. IR분석결과 분해율이 33.4% 이상이 되면 염기성 염화알미늄 생성을 의미하는 980cm^-1 부근에서의 Al-OH band가 나타났다. 분해율이 증가하면 제조된 PAC의 염기도(basicity)가 증가하였다. 상용 PAC의 염기도 기준치 45% 이상을 얻기 위해서는 분해율이 45%이상이 되어야 함을 알았다. NMR 분석결과 PAC 용액 내에는[Al(H₂O)₆)]³⁺단분자와 염화알미늄 고분자가 공존하는 것으로 나타났으며, 분해율이 증가할수록 고분자의 비율이 증가하였다. 염화알미늄의 부분 열분해에 의해 제조된 PAC의 응집특성을 금강물을 대상으로 하여 확인하였다.

Presented is a new method of manufacturing PAC(polyaluminum chloride) used as flocculant for water treatments : PAC is obtained through partial decomposition of aluminum chloride hexahydrate at 180℃ to give basic aluminum chloride followed by dissolving the basic chloride in water. With varying the extent of decomposition, properties of the solid-state basic chloride and the PAC solution were analyzed. The IR analysis showed that at an extent of decomposition of 33.4% an absorption band appeared at 980cm^-1 indicating the formation of basic aluminum chloride. The basicity of the PAC solution was observed to increase with increasing the extent of decomposition. In order to meet the basicity of 45% required for commercial grade PAC, it was found necessary to have an extent of decomposition higher than 45%. According to the NMR analysis, both[Al(H₂O)₆]⁺³monomer and aluminum chloride polymers were present in the PAC solution. The molar ratio of the polymers to the monomer increased with an increase in the extent of decomposition. The PAC manufactured by the present method was tested on the water taken from the Kum river.

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References

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