C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
117/45
C04B 20/10 (2006.01)
Patent
CA 2016974
COATING METHOD FOR ENCAPSULATION OF PARTICULATE MATTER ABSTRACT OF THE DISCLOSURE Particulate and fibrous materials are encapsul- ated 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 pro- cess. Deposition of an excess amount of phosphate solu- tion on the particulate surfaces leads to well bonded encapsulated products. The process can be accelerated by heating either of the reactive components to 100° 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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