| 摘要 |
<p>A new moulding material consists of 35-75 wt.% expanded glass granules of less than 5 mm size and 10-40 wt.% waterglass. A moulding material consists of 35-75 wt.% expanded glass granules of less than 5 mm size, 10-40 wt.% (mainly sodium) waterglass, 0-20 wt.% alumina cement and 0-30 wt.% flyash. Preferred Features: The waterglass consists of 60 wt.% sodium waterglass, 15 wt.% potassium waterglass and 25 wt.% silicic acid and the flyash is a hard coal flyash which contains 50 wt.% silicic acid and 25 wt.% aluminum oxide.</p> |
