Dispersants and their use in aqueous coal suspensions

摘要

Dispersants for aqueous coal suspensions containing (a) lignin sulfonic acid and/or alkali metal, alkaline earth metal and/or ammonium salts thereof, (b) one or more alkyl ether phosphates corresponding to general formulae (I) and/or (II) below (I) (II) in which R is straight-chain or branched C8-C22 alkyl or alkenyl radical, M is hydrogen, an alkali metal, ammonium, or an alkaline earth metal, and m and n are numbers of from 1 to 15, and (c) optionally, other auxiliaries of the type typically present in such dispersants.