| 摘要 |
Perlite, a volcanic glass, is used in a variety of horticultural, construction and industrial applications. In order to be put to such uses, mined perlite ore is crushed and screened to size and then expanded by being passed through a flame at high temperature. During the expansion phase, up to 50% of the perlite may be unintentionally fractured, resulting in very fine perlite material with little or no commercial application. The method and product of the present invention converts saleable expanded perlite, as well as fine perlite material (which is of such a size and quality that it is of no value to a manufacturer and is difficult to dispose of) into a relatively dust free product with numerous end applications, some of which are new uses for perlite.
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