ACID SOILS, PROCEDURES FOR THE MANUFACTURE OF ACID SOILS AND THE USE OF THESE SOILS.

摘要

Silica sols having a high content of microgel and aluminum modified particles with high specific surface area. The sols can be prepared by a process comprising acidification of a water glass solution, alkalization at a certain dry substance content, particle growth and aluminum modification. The sols are particularly suitable for use as additives, in combination with cationic polymers, in papermaking.