Silicate based and polysalt containing hollow microspheres...

Details Silicate based and polysalt containing hollow microspheres... Silicate based and polysalt containing hollow microspheres...

B - Operations, Transporting

01

J

117/46.2

B01J 13/02 (2006.01) C03B 19/10 (2006.01) C03C 11/00 (2006.01) C03C 21/00 (2006.01)

Patent

CA 1152816

ABSTRACT OF THE DISCLOSURE Non-fused hollow glass microspheres that consist primarily of silicate are rendered more water-resistant by treatment with multivalent metals. The hollow microspheres are slurried with water and then a solution of a multivalent metal salt such as Al2(SO4)3 is added to the slurry. The rate of the addition is controlled so that the pH can be regulated. Separ- ating, washing and drying complete the preparation. The microspheres so prepared are characterized by a weight % ratio of "polysalt" solids to sodium silicate solids of 0.02:1 to 2.0:,1, said sodium silicate containing 1.5 to 4.0 moles of SiO2 per mole of Na2O; a particle size of 35 to 2000 microns; a bulk density of 2 to 20 lbs/cu.ft., less than 7% moisture and 0.1 to 5.0% of a multivalent metal that decreases the solubility of the microsphere in water.

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