| abstract |
A refractory insulating block consists of a cemented mass of refractory material, e.g. iron oxide, rock wool, asbestos, and the product resulting from baking (a) a sugar, e.g. dextrose, sucrose, fructose, or mixtures thereof, or maltose lactose, beet or cane molasses, greens, hydrol, and (b) an inorganic adjunct consisting of one or more of sulphuric acid, phosphoric acid, hydrochloric acid and salts which produce these acids during baking of the block, e.g. ammonium sulphate or bisulphate, alums such as ammonium aluminium sulphate. Bentonite may also be included. In making the block, 100 parts of refractory material, 0,5 to 6 parts of sugar, and 0,03 to 0,9 parts of adjunct are slurried in 600 to 1000 parts of water, liquid is removed from the slurry, and the material is shaped into a block and baked at 300 DEG F. to 500 DEG F. |