| 摘要 |
In the manufacture of foamed glass, glass wool, or slagwool, particulate raw materials mixed with powdered solid, liquid, or carbonaceous fuel, and an associated stream of oxygen-containing gas are fed into or on to a <PICT:1003026/C1/1> stream of molten glass maintained in one-way movement past a taphole through which part of the molten mass is removed and the remainder is recirculated to form the stream receiving the raw materials. Preferably an annular furnace is employed, apertures 4, 5, 6 for the injection of the mixture of the raw materials and fuel, and apertures 10, 11 for the supply of the oxygen-containing gas being provided and so arranged as to cause the stream to flow round the furnace. In starting up the furnace, only fuel and gas are injected and when it is sufficiently hot a supply of glass from a previous melt is supplied to form a molten mass into or on to which the mixture of raw materials and fuel can be supplied. A portion of the molten material is withdrawn at the taphole 8 and the combustion gases escape through an adjacent port 9. Modified forms of the furnace designed to ensure circulation of the stream of molten material are described. The furnace may be fed with a slag having the composition SiO2 38%, CaO 35%, Al2O3 18%, MgO 4.5%, Na2O 1.5%, K2O 2%, other 1%, or with a mixture of silica sand 20 parts, burnt lime 10 parts, crushed soda glass 20 parts, and dry brown coal 50 parts. |
