| 摘要 |
COATING METHOD FOR ENCAPSULATION OF PARTICULATE MATTER Particulate and fibrous materials are encapsulated with a monolithic coating of controlled thickness through a multiple step simple rapidly bonding process by first treating the particulate material with an acid phosphate and particularly with sequestered ammonium polyphosphate or superphosphoric acid and a powdered mineral solid of the magnesium alkali earth metal oxide carbonate or silicate type capable of reacting with the said acid phosphate inagranulator drum or spraying process. Deposition of an excess amount of phosphate solution on the particulate surfaces leads to well bonded encapsulated products. The process can be accelerated by heating either of the reactive components to 100.degree. Centigrade and by the use of magnesium oxide heavy powder, calcined dolomite, magnesite, olivin, serpentine or marble powder in leu of dead burned magnesium oxide in combination with powdered raw dolomite, magnesite, olivin, serpentine or marble. The process can be repeated until the desired coating thickness is achieved.
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