L. P. Firsova
strength of the granuls on base crystallosolvates of calcium sulfate
It was investigated
carbamide addition effect on the phosphogypsum granuls compression strength.
X-ray difraction analysis was demonstrated, that the carbamide and the calcium
sulfate produce crystals solvate CaSO4.4CO(NH2)2 in
the granuls. Due to the fact, that the granuls pore volume are filled with
crystallized solvate CaSO4.4CO(NH2)2 and carbamide, the carbamide addition in
wet phosphogypsum provides a high compression strength of the granuls.
Furthermore, the strengthening process is accelerating in the presence of the
carbamide addition in the granuls.
Copyright (C) Chemistry Dept., Moscow State University, 2002