| 摘要 |
Crystalline or crystal-like substances, such as quartz sand, waste glass, and kieselguhr are intimately mixed with such a quantity of a mineral substance which reacts with water to form a water-insoluble compound, such as a hydroxide of a metal of Group II of the periodic table, to obtain a microfilm layer on the material grains, and are then agglomerated in known manner using a pelletising liquid. After wetting the crystalline material, the metal oxide is fed in dry form and is intimately mixed with the material to be pelletised, agglomeration then taking place while feeding pelletising liquid. The completion of the reaction can be monitored through the heat of reaction. The pellets can be provided with a coating of the same or another material which is insoluble or difficultly soluble in water. |
