SEDL / STP / STP1460-EB / STP11974S

The Effect of Dispersant Solubility, Dispersant Dosage, Granule Diameter, and Dome Versus Radial Extrusion on Granule Spontaneity of Disintegration and Resistance to Attrition

Winowiski, T
Senior Research Associate and General Manager Research and Development, LignoTech USA Inc., Rothschild, WI

Lebo, S
Senior Research Associate and General Manager Research and Development, LignoTech USA Inc., Rothschild, WI

Gustafsson, J
Research and Development Lab Manager, Borregaard LignoTech, Sarpsborg,

Pages: 10    Published: Jan 2005

Download this paper for $25 PDF (188K)          View License Agreement
Abstract

Dissolution rate of 16 sulfonated dispersants was measured in both water and 32-0-0 liquid fertilizer. Two dispersants, BNA and UCA, having different dissolution rates, were used to granulate a 70 % Amicarbazone formulation. Extrusions were made on a MG-55 Multigranulator using both the dome and radial modes with 0.8 mm and 1.0 mm screens. BNA and UCA were included at levels of 5, 10, and 15% of the formulation. The remaining 14 dispersants were compared at fixed levels of 10 % using only the 0.8 mm screen and dome mode. Premix water requirements varied according to dispersant chemistry. Granule disintegration was measured in hard water by number of inversions, ASTM E l945, and CIPAC MT-174. High level of dispersant, slow dissolution rate of dispersant, and larger diameter granules lead to reduced disintegration rate in water. In addition to these factors, disintegration in 32-0-0 was further affected by porosity of the granule.