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Volume 74, Issue 12
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EFFECT OF ACID SOLUTION TREATMENTKazuo Torii, Masami Hotta, Makoto Asaka1979 Volume 74 Issue 12 Pages 423-432
Published: December 05, 1979
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe effect of acid treatment on some physico-chemical properties of clinoptilolite tuff from Futatsui, Akita Pref., was investigated by means of a powder method of X-ray diffraction, chemical analyses and measurement of gas adsorption.
Aluminium was dissolved by acid treatment and consequently the ratio of silica to alumina increased as follows: 10.2-33.2 for the specimens treated with 0.01-5N-HCl solu. at 97-98°C, 11.2-18.7 for the specimens treated with 0.1-6N-H2SO4 solu. at 97-98°C and 10.3-14.1 for the specimens treated with 0.24-2.4N-HF solu. at room temperature.
When aluminium dissolution ratios after treatments with HCl or H2SO4 solu. are below 12.% the intensities of X-ray diffraction 132 in clinoptilolite were not virturally changed. However they decreased gradually with the increase of aluminium removal at above 12%. When the aluminium dissolution ratios were 14, 25, 35, 52 and 71% after HCl treatment, the intensity of X-ray peak 132 of clinoptilolite decreased to 95, 86, 74, 59 and 33% respectively compared with that of original clinoptilolite tuff. Thus the progressive removal of aluminium from the frameworks resulted in the gradual collapse of clinoptilolite structure.
Na+ and K+ were exchanged with H+ by the acid treatments, and a little Ca++ was exchanged but the exchange of Mg++ was not detected, hence H-riched clinoptilolite was obtained.
The apparent diameter of small aperture in clinoptilolite was enlarged by the acid treatments and the amount adsorbed of C3H8 increased according to the enlargement of the diameter of small pore. However the amount of CH4 and CO2 decreased with the decrease of zeolite content by acid treatments, because they adsorb on both large and small pores in clinoptilolite.View full abstractDownload PDF (424K) -
KAKKONDAGAWA AND KITANOMATAGAWA AREAS, IWATE PREFECTUREKeiji Kimbara, Taiji Ohkubo, Kiyoshi Sumi, Yoshiaki Chiba, Seiji Saito1979 Volume 74 Issue 12 Pages 433-442
Published: December 05, 1979
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe rock alteration of this area is classified into regional and local ones. The regional alteration consists of montmorillonite and chlorite zones. Considering the distribution and associated mineral paragenesis, it is assumed that the montmorillonite zone is not directly related to geothermal activity in its genesis, but diagenetic condition, however, the chlorite zone was formed under the alkaline hydrothermal condition.
The present writers suggest a new method for alteration survey using _??_2θ value indicating the abundance of expandable layer in the interstratified mineral of sericite and montmorillonite. By this method, the chlorite zone is subdivided into five subzones according to the iso-_??_2θ line as 0, 1, 2 and 3
Alteration minerals such as pyrophylite, kaolin and alunite cccur locally under the acidic hydrothermal condition related to recent geothermal activity.View full abstractDownload PDF (415K) -
KATSUTOSHI TOMITA, MASATO KOISO, MASAHIKO YAMAMOTO, NOBORU OBA1979 Volume 74 Issue 12 Pages 443-449
Published: December 05, 1979
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSA laumontite occurs in the cracks of an andesite at Kinzan, Satsuma-cho, Kagoshima Prefecture. Alkali content of the laumontite is higher than that of laumontites reported in Japan so far. Unit-cell constants calculated from x-ray powder data are very close to those of reported laumontites; a=14.765±0.007Å, b=13.135±0.005Å, c=7.561±0.004Å and β=111.766±0.04°View full abstractDownload PDF (934K)
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