THE PHYSICOCHEMICAL SURFACE-PROPERTIES OF FELDSPAR AND SOME ATTEMPTS OF ITS PURIFICATION

In this paper the results of the qualitative analysis of the basic ele ments and impurities of the domestic feldspar are presented. From n-oc tane and toluene adsorption measurements the components of the free su rface energy were calculated and from the porosity investigations the pore size distribution curves were obtained. The adsorption and mercur y porosimetry data showed the energetical and structural heterogeneity of the examined material. Having in consideration the industrial appl ication of this mineral, preliminary tests of the chemical purificatio n from iron additives by some acids were carried out. It appeared that the best results were achieved after etching it with aqua regia (nitr ochloric acid).