Abstract
The past twenty years have seen great developments in ion-exchange techniques and their application, both on a laboratory and on an industrial scale. A considerable impetus was given to this subject during the war years, culminating in the successful application of ion-exchange methods to the separation of the rare earths and of other closely related elements. At the same time attempts were being made to use ion-exchange materials for the recovery of trace elements from solutions and process wastes, an application which is of importance in waste-disposal problems as well as for metal recovery. The importance of demineralized water supplies in a variety of chemical and metallurgical operations has led to considerable developments in water-treatment methods involving ion exchange; in addition, many new and valuable analytical separations have been achieved by using ion-exchange methods.
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