| 摘要 |
PURPOSE:To obtain foamed glass particles having low bulk density, sufficiently high crush strength and excellent heat-insulation, at a low cost, by forming glass powder and powdery inorganic foaming agent with a binder in the foam of spheres, coating the spheres with an anti-blocking agent, and sintering under rotation. CONSTITUTION:Glass powder and powdery inorganic foaming agent are bonded with a binder in the form of particles, and reformed to spherical particles. The spherical particles are coated with an anti-blocking agent, and then heated in a rotary kiln under rotation to obtain the objective foamed glass particles. The powdery inorganic foaming agent is e.g. CaCO3 powder, Glauber's salt, sodium bicarbonate, etc., and its amount is preferably 0.5-10wt% based on the glass powder. The binder is preferably an aqueous solution of PVA, an aqueous solution of carboxymethylcellulose, etc., having a concentration of 0.5-10wt%.
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