含水 鹽化마그네슘의 脫水 特性 考察
Dehydration characteristics of Magnesium ChlorideHydrate
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초록
마그네슘 용융염전해의 원료물질로 무수염화마그네슘이 일반적으로 사용된다. 그러나 함수염화마그네슘으로부터 무수염화마그네슘을 제조하기 위한 탈수과정은 가수분해가 동반되어 마그네슘 산화물들이 생성되므로, 공기 중에서 탈수를 통한 무수염화마그네슘 제조는 어렵다. 본 연구에서는 공기중에서와 염화수소 분위기 하에서 탈수 온도(200~600oC)에 따른 탈수특성을 비교하였다. 공기중에서는 탈수온도가 증가함에 따라 MgOHCl과 MgO가 생성되었지만, 염화수소 분위기하에서는 300oC 이상에서 무수염화마그네슘이 생성되었다. 염화수소 분위기에서 무수염화마그네슘은 약 300oC에서 생성되기 시작하여 500oC에서 결정화가 완전히 이루어 지는 것을 확인하였다. 탈수실험에 사용된 염화수소는 모두 물에 용해시켜 염산으로 회수되었으며, 수용액 온도 20oC에서 최대 41%의 염산을 회수할 수 있었다.
Abstract
Anhydrous magnesium chloride, dehydration product from magnesium chloride hydrate is a general raw material to prepare electrolytic magnesium. However, the dehydration is not trivial and can be accompanied by hydrolysis leading to the production of undesirable hydroxy chloride compounds of magnesium. Therefore, dehydration process is actually the most complicated and hardest in the electrolysis methods for the production of magnesium. In this work, the influence of dehydrating temperature has been studied at the temperature range from 200oC to 600oC in air and HCl gas atmosphere individually to compare the results. With increasing of dehydration temperature MgOHCl and MgO were obtained in air. On the other hand, when the temperature was increased above 300oC anhydrous magnesium chlorides were prepared in HCl gas atmosphere. Anhydrous magnesium chloride was formed at near 300oC and completely crystallized at about 500oC. All of the HCl used as atmosphere gas in the dehydration was recovered as hydrochloric acid solution at a water vessel up to 41% by weight at 20oC.
참고문헌 (7)
- S. Kashani-Nejad, "Oxides formed dyring the dehydration of magnesium chloride hexahydrate", pp.81~92 (2006)
- Georges J. Kipouros, "A thermochemical analysis of the production of anhydrous MgCl2", (1), pp.111~117 (2001)
- Horst, E. Friedrich, "Magne-sium Technology", pp.35~ (2006)
- Long Guangming, "The reaction of MgCl2·4H2O with CCl2F2", pp.231~235 (2003)
- S. Kashani-Nejad, "Characterization of MgOHCl", MgO mixtures with infrared spectroscopy, 2004, 161~165
- The Merck Index, "p. 696.含水 鹽化마그네슘의 脫水 特性 考察 PAGE 2PAGE 5 嚴炯春·尹虎成·朴馨圭·金哲主자원리싸이클링 제16권 제5호 2007J. of Korean Inst. Resources Recycling Vol. 16 2007J. of Korean Inst. of Resources RecyclingVol. 16" (1983), Inc
- The Merck Index, "p. 696.含水 鹽化마그네슘의 脫水 特性 考察 PAGE 2PAGE 5 嚴炯春·尹虎成·朴馨圭·金哲主자원리싸이클링 제16권 제5호 2007J. of Korean Inst. Resources Recycling Vol. 16 2007J. of Korean Inst. of Resources RecyclingVol. 16" (1983), Inc