GRANULATES CONTAINING ALKALINE-EARTH CARBONATES

摘要

Granules based on alkaline earth metal carbonates often contain unwanted organic additives or alkaline earth metal hydroxides. In the novel granules, the weight percentage of non-carbonate impurities is < 5 %. The basic effect can be easily buffered, and the granules can be easily converted back into the original particle size with little mechanical effort. The binder is an alkaline earth metal carbonate recarbonatised from alkaline earth metal hydroxide. Recarbonatisation can preferably take place with the addition of water and reaction with gaseous CO2 in a fluidised bed in which the bed is set to such a height that the rate of the reaction with CO2 is greater than the drying rate of the bed. The granules can be used as component of a feeding stuff.