초록 ▼

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°F.-2100°F. to produce uncoated particles which exhibit superior short term and long t

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°F.-2100°F. to produce uncoated particles which exhibit superior short term and long term density stability characterics in liquid systems, and which may subsequently be coated to provide enhanced density stability characteristics.

대표청구항 ▼

An expanded mineral product comprising: mineral particles made from the group consisting of perlite, pumice, pumicite, pitchstone, obsidian and volcanic ash and which have been expanded to a greater volume then the volume of the particles prior to expansion, said expanded mineral product particles b

An expanded mineral product comprising: mineral particles made from the group consisting of perlite, pumice, pumicite, pitchstone, obsidian and volcanic ash and which have been expanded to a greater volume then the volume of the particles prior to expansion, said expanded mineral product particles being uncoated, having a substantially smooth, non-porous surface and a nominal density less than about 2.0 gram/cc. as measured by air comparison pycnometer, and said particles having the property that when mixed with an emulsion or liquid which is chemically inert to said particles and which has a viscosity in the range of about 25,000 to 100,000 centipoise and at about 2% by weight of said particles to said liquid to form a mixture, said mixture is subjected to a vacuum of about 25″Hg for 10 minutes and then released, the density change of said liquid is less than 10%.