ISSN:
0009-286X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Separation of mineral salts on the basis of specific material properties. This survey explains how different specific properties which are „inherent“ to the material, such as density, magnetizability, and conductivity, can be utilized to separate mixtures of solids into individual components. As for salt minerals, the differences in their physical characteristics are very small and mostly not significant enough to allow a technical separation. Therefore the selective leaching based on the difference in hydration of the crystal components (ions) has been the predominant process. However, the selective dissolution of a specific type of salt and its subsequent recrystallization requires a high energy input and leads occasionally to environmental problems. It is for this reason that the mechanical procedures of „flotation“ and „electrostatic separation“ (ESTA-process) have meanwhile become interesting alternatives. In these processes specific surface properties, i. e. „external“ properties, are used for the separation. Non-utilizable residual liquids, which often occur in the dissolution process and result in waste water problems, can thus be avoided. The principle of these two separation procedures as well as their application to the refinement of crude salts containing potassium and magnesium are described.
Additional Material:
16 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cite.330620306
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