摘要:
A METHOD FOR THE MANUFACTUER OF COATED-TYPE LIGHT WEIGHT AGGREGATES WHICH COMPRISES MIXING A SILICIFEROUS MATERIAL, PARTICULARLY A MATERIAL SUCH AS FLY ASH WHICH IN ITSELF IS LOW IN PLASTICITY, WITH SLUDGE FROM A SEWAGETREATING PLANT AND, IF NECESSARY, WITH SODIUM SILICATE OR THE LIKE AS AN AUXILIARY BINDER, GRANULATING THE RESULTANT MIXTURE INTO PELLETS, AND BURNING THE PELLETS IN A ROTARY KILN.