PROCESS FOR MAKING HIGH POLYMERIC DISPERSANTS SUITABLE FOR EFFECTING SEPARATION OF CLAYS AND OTHER MATERIALS CONTAINING ACTIVE HYDROXYL GROUPS ON THE SURFACES PRESENT IN ORES AND MINERALS

摘要

Described herein is a process for the preparation of high polymeric dispersants suitable for effecting the separation of clays and other materials containing active hydroxyl groups on the surface of ores and minerals wherein an alkali metal sulphite or metabisulphite and a lower aliphatic aldehyde are reacted by heating with a phenol, and the reaction product of this is in turn reacted with a watersoluble aliphatic aldehyde such as formaldehyde.