Purification of aluminum nitrate nonahydrate by melt crystallization

Mizuki Kumashiro*, Yoshinori Izumi, Takuya Hoshino, Yusuke Fujita, Izumi Hirasawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The objective of our study is to investigate the effect of melt crystallization on inorganic hydrate for purification of crystals including impurity. Melt crystallization is widely applied in the chemical and food industry to purify organic crystals by separating impurities inside the crystals. The target crystals are mainly organic crystals; however, some inorganic crystals are considered for purification by melt crystallization, because of having lower melting point as hydrate crystals. Therefore, we prepared hydrate crystals including impurities and carried out melt crystallization to investigate the purification mechanism on inorganic crystals. Aluminum nitrate nonahydrate was selected as purification target and strontium nitrate was selected as liquid impurity. As solid impurity, we selected barium nitrate. In conclusion, liquid impurity in target crystals was removed by sweating and washing with melt. Moreover, it was considered that the purification mechanism differs depending on the state of the impurity, and melt crystallization is an effective tool for purification the inorganic hydrate crystals.

Original languageEnglish
Pages (from-to)105-109
Number of pages5
Issue number2
Publication statusPublished - 2011


  • Inorganic Hydrate
  • Melt Crystallization
  • Purification

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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