Showing papers in "Glass and Ceramics in 1978"

Use of coarse-crystalline potassium feldspar from kaolin deposits

Abstract: Most of the kaolin deposits are confined to weathered paleolithic rock. Intensively metamorphosed rocks lie above the weathered depth while below they gradually change into permanent parent rocks. The deposits of kaolin which arise from leucocratic, porphyric, and other granites are of the greatest industrial interest. When they are formed, the ironmineral ores (pyrites, magnetite, etc.), of course, dissolve and are removed. In the first stage of weathering these ferrous silicates produce ferrous montmorillonite minerals which change into kaolinite. During this process some of the iron and titanium is removed while some remains inside the flakes of kaolinite and lowers the whiteness [i].

Emission spectral analysis of enamel glasses

Abstract: Table 1 gives the lines for the analysis of elements in a copper powder. It is clear that the copper lines differ only slightly from the lines of the experimental elements. The presence of > 0.005% of tin and lead is determined from the tin lines at 2839.9 A and the lead lines o at 2833 A. When the results of three parallel determinations had been averaged the reproducibility was increased 1.7-fold. Lack of correspondence among the reference specimens was ruled out since, three standards whose calculated composition was confirmed by chemical analyses [1] were melted for each glass composition. The