Coated particles useful in the preparation of a concrete or a mortar, comprises a core comprising ferrous sulfate, tin sulfate and/or manganese sulfate and an envelop comprising a natural/synthetic polysaccharide

摘要

Coated particles, comprises a core comprising ferrous sulfate, tin sulfate and/or manganese sulfate and an envelop comprising a natural/synthetic polysaccharide. Independent claims are included for: (1) a cement comprising the coated particles; (2) a cement comprising ferrous sulfate, tin sulfate and/or manganese sulfate at less than 0.2 wt.%, preferably less than 0.1 wt.% and having a chrome (VI) content of less than 2 ppm; and (3) preparation of the coated particles comprising mixing a powder of ferrous sulfate, tin sulfate and/or manganese sulfate with a polysaccharide solution and drying the obtained mixture.