METHOD FOR MANUFACTURE OF LIGHT-WEIGHT REFRACTORY PRODUCTS Russian patent published in 1995 - IPC

FIELD: manufacture of refractories. SUBSTANCE: use is made of slag wastes of aluminium production of the following composition, mas.%: aluminium oxide 15-25; magnesium oxide 1-10; silicon dioxide 1-10; alumomagnesia spinel 2-10; aluminum 1-10; sodium chloride 30-45; potassium chloride 20-50. After molding the products are fired temperature of 1400-1550 C. Heating rate up to maximum temperature is 100-300 C/h, and cooling rate is not in excess of 300 C/h. Method provides for manufacture of refractory with opened porosity of 57-63% and compression strength of 7.3-11.2 MPa. EFFECT: higher efficiency.