| 摘要 |
A method and an apparatus are described whereby a product is obtained which comprises particles containing agglomerated therein granules of sand, and optionally also of other glassmaking constituents, at least partially coated with and joined together by alkali metal metasilicate. The raw granules are fluidized in a bed of gas and homogeneously treated from within the bed with an aqeuous solution of alkali metal hydroxide. The product has improved handling characteristics, having both low hygroscopicity and low friability. |
