METHOD FOR THE PRODUCTION OF MAGNETIC SILICIC ACID PARTICLES

摘要

The invention relates to a simple and inexpensive method for producing magnetic silicic acid particles. Said method comprises the following steps: a) a liquid reaction mixture is supplied that contains: a.1) a liquid, aqueous reaction medium; a.2) magnetic particles suspended in the mixture; a.3) at least one compound which is used as a silicic acid source; b) a pH modifier is added; and c) the reaction mixture obtained in step b) is then spray-dried, an organic expanding agent being added to the reaction mixture during or following step a) or b), i.e. prior to step c). The invention further relates to the magnetic silicic acid particles obtained according to said method as well as various analytical methods or purification methods carried out with the help of the magnetic silicic acid particles according to the invention.