Sonochemical synthesis of ettringite from a powder mixture suspended in water

Kibu Chiyo, Fumio Saito

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Aqueous suspension containing Ca(OH)2, Al(OH)3 and gypsum (CaSO4.2H2O) powders was subjected to ultrasound irradiation under atmospheric pressure to investigate its effect on synthesis of ettringite (3CaO.Al2O3.3CaSO4.32H2O). Irradiation of ultrasound to the suspension enables us to form ettringite in the product, and the sonochemical synthesis reaction reaches the equilibrium by about 120 min. Addition of excess amount of Ca(OH)2 powder is effective in consuming the remained gypsum in the product, leading to the high yield of ettringite. Heating the suspension at about 80°C, which is the same degree in the ultrasound irradiation, for 480 min produces tri-calcium aluminum monosulphate (CAM). The formation of CAM plays a significant role in delaying the synthesis reaction of ettringite in the suspension. Copyright (C) 2000 Elsevier Science S.A.

Original languageEnglish
Pages (from-to)43-47
Number of pages5
JournalPowder Technology
Volume107
Issue number1-2
DOIs
Publication statusPublished - 2000 Jan 24

Keywords

  • Ettringite
  • Sonochemistry
  • Tri-calcium aluminium monosulphate
  • Ultrasound

ASJC Scopus subject areas

  • Chemical Engineering(all)

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