Modern Gasworks Practice

REFRACTORIES FOR GAS WORKS PURPOSES 197 (&) Ewell Type. Silica. . 87-57 per cent. Alumina ........ 3-60 ,, Ferric oxide ....... . 4-80 „ Lime ........ ■ 0-74 „ Magnesia ........ 0-41 „ Potash ........ . 0-69 „ Soda ......... . 0-10 „ Water of combination...... . 2-09 „ 3. Silica Clays. (») Dinas. Silica. ........ 97-6 per cent. Alumina ........ • 0-5 Ferric oxide ....... ■ 1’5 „ Lime ......... 0-2 Potash ........ . 0-09 „ Soda ......... . 0-03 „ (&) Black Ganister. (Bywater.) Silica. ........ 98-5 per cent. Alumina ........ • 0-3 Ferric oxide ....... . 1-3 Lime ........ . 0-2 Potash ........ Traces. Soda ......... Traces. (c) Oughtibridge (Type B). Silica. ........ 94-78 per cent. Titanic oxide ....... . 0-20 „ Alumina ........ . 1-65 „ Ferric oxide . . . . . . 0-62 „ Lime ........ . 1-51 „ Magnesia ........ . 0-01 „ Potash ........ . 0-54 „ Soda ......... . 0-34 „ This material is of very similar nature to the Oughtibridge type given under siliceous clays, with the exception. that this variety is mamifactured with tlie lime bond, whereas that previously mentioned is not. (d) Bonnybridge (Type A). Silica. Alumina Ferric oxide Lime Magnesia . . 95-03 per cent. 2-73 „ 0-45 „ 1-80 „ 0-11 „ 4. Scotch Clays (Aluminous). (a) Glenboig. Silica. 53-26 per cent. Alumina 42-10 „ Ferric oxide 2-08 „ Titanic oxide 1-50 „ Lime Trace. Magnesia . Trace. Sulphates . 1-06 per cent. The iron content is frequ.en.tly higher than shown above.