Utilisation of industrial wastes and by-products for the synthesis of special cements

✍ Scribed by J. Beretka; B. de Vito; L. Santoro; N. Sherman; G.L. Valenti

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 576 KB
• Volume: 9
• Category: Article
• ISSN: 0921-3449
• DOI: 10.1016/0921-3449(93)90002-w

✦ Synopsis

Calcium sulfoaluminate, which is the main component of low energy cements, can be synthesised using pure and commercial raw materials, as well as industrial wastes and by-products. It has been found that industrial process wastes like fly ash, blastfurnace slag, phosphogypsum and bauxite fines allow the synthesis of the binder to be performed at about 1200 °C with high yield and satisfactory selectivity. Besides the main mineral components calcium sulfoaluminate, dicalcium silicate and anhydrite, a number of side products (minor mineralogical phases) were also present. Furthermore, calcium sulfosilicate formed instead of dicalcium silicate in the presence of excess calcium sulfate.