| 摘要 |
A non-porous, substantially hollow, expanded mineral product, such as expanded perlite, is produced by uniformly and indirectly heating ore for about 1 to 30 seconds in an expansion chamber maintained at about 1400 DEG F-2100 DEG F to produce uncoated particles which exhibit superior short term and long term density stability characteristics in liquid systems, and which may subsequently be coated to provide enhanced density stability characteristics. |
