Expanded perlite

A natural acidic vitreous lava volcanic non-metallic mineral, including perlite, rosin and obsidian, all of which differ only in crystal water content. Since it expands rapidly 4 to 30 times under high temperature conditions of 1000 to 1300 ° C, it is collectively referred to as expanded perlite. Generally, the expansion ratio is >7 to 10 times (black shale >3 times, available), and silicon dioxide is about 70%. All are open pit mining. No beneficiation, just crush and sieve.

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