Mineralogical estimation on the stability of buffer materials for long range(II)

not registered

In order to clarify the stability of smectite for long range, three thema following below were studied in this paper. (1)Mineralogical study on bentonite contacted with iron (2)Fe concentration in carbonate nodules of bentonite ore deposit (3)The alteration effect of smectite to illite or chlorite by Al, Ca, K and Fe concentrations. The results in each part were followed below. (1)Bentonite contacted with iron turned into brown from green in color. Constituent minerals; smectite were not changed in mineralogical properties. (2)In Tsukinuno bentonite mine, Ca, Mg, Fe and Mn were concentrated in the carbonate minerals ; Ca (Mg, Fe, Mn) (CO).. Dolomite crystals of nodules has the zonal structure where Fe is poor in core and richi in rim. (3)Fe-chlorite was synthesized at 0.1 GPa and 450C by using the mixtures of Kpa-F or SWy-1, and magnetite. The interstratified I/S, which synthesized in the previous short run (20 days), disappear at 365 days. This experimental results suggest that chlorite appears at 350C in the longer run than the previous short run. At 125 C, K-concentration is more important for K-fixation in smectite layer than Ca content in K-concentration of 0.5 N(20000ppm). In the longe run than 763 days, Ca content in K-concentration of 0.05N (2000ppm) inhibits an active effect of K-fixation in smectite layer.