Journal of the Clay Science Society of Japan (in Japanese)
Online ISSN : 2186-3563
Print ISSN : 0470-6455
ISSN-L : 0470-6455
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Volume 44, Issue 4
Displaying 1-4 of 4 articles from this issue
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  • Flue Gas Purification at High Temperatures Using Alkaline Minerals
    Hiroaki SHINGU, Kenzi SUZUKI, Tomio YAMASAKI, Satoru FUJITA, Naoyuki O ...
    2005 Volume 44 Issue 4 Pages 171-175
    Published: July 25, 2005
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.44.171
    JOURNAL FREE ACCESS
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    As a result of examining chlorine fixation performance at high temperatures and combustion (oxidation) catalytic property of hydroxyl sodalite (Na8 (AlSiO4) 6 (OH) 2) and hydrogrossular (Ca3Al2 (SiO4) 0.8 (OH) 8.8) using the laboratory scale reactor, it was confirmed that both materials had each function. The confirmation test of HC1 removal at high temperatures and dioxins formation control in the flue gas was carried out using the fixed bed and the fluidized bed equipment of the large scale. As a result of the test, it was confirmed that the HC1 gas in flue gas could remove at high temperatures and the dioxins concentration effectively decreased. From the facts described above, we may conclude that the reduction of HC1 concentration and the combustion of the dioxins precursor are effective for the dioxins formation control.
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  • Zn-S-and Fe-Microbial Mats on the Outer Surface of Well Riser Pipes
    Shuichi SHIRAISHI, Naoto TAKAHASHI, Yasuhiro SHIMOJIMA, Ryuji ASADA, H ...
    2005 Volume 44 Issue 4 Pages 176-190
    Published: July 25, 2005
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.44.176
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    Bluish green Zn-S-and yellowish brown Fe-microbial mats were found on outer surfaces of well riser pipes on Kakuma campus of Kanazawa University, Ishikawa Prefecture. The microscopic observation and XRF chemical analysis revealed that the formative conditions of microbial mats differ in depth due to stationary and pumping groundwater levels. Bluish green microbial mats formed in 61.6-75.6 m depth were characterized by high content of Zn and S. The microbial mats mainly consist of spherical fifine particles of several Am in size. A small amount of coccoid-and bacilli-form bacteria were found in the aggregation. While, yellowish brown microbial mats formed in 30.8-61.6 m depth and were characterized by high content of Fe, Ca, P, Si and Zn. The microbial mats mainly consist of spiral materials that were metabolized from an iron oxidizing bacterium, Gallionella ferruginea. Harp-like materials metabolized from another iron oxidizing bacteria, Toxothirixspp. were also found below 56 m in depth. A large amount of coccoid-, bacilli-and filamentous-form bacteria were found in the assemblage of the metabolic materials and the number of filamentous-form bacteria increased with depth.
    TEM observations and FE-TEM-EDX elemental maps revealed that some spherical particles on the cell surface of bacteria in the bluish green microbial mats are rich in Zn and S stick, suggesting that Zn exist as sulfide. The other adhesion materials consisted of Fe, Si, 0, and Zn were also formed around cell wall. The bacteria inthe bluish green microbial mats might be tolerant to heavy metal Zn.
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  • Fluoride Content in Biotite from Hiroshima Granite
    Katsuaki WATANABE, Takashi HIRATA, Mayumi JIGE, Hiroshi OGASAWARA, Ryu ...
    2005 Volume 44 Issue 4 Pages 191-198
    Published: July 25, 2005
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.44.191
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    According to the Soil Contamination Countermeasures Law of Japan (established in 2002), fluoride (chemical compound of F-) is designated to one of the environmental toxic substances, because of the characteristic diseases caused by abundant intake (e.g. spotted teeth and furthermore born accidents). The base line of soil fluoride content is decided by the law to be 4000mg/kg as heat-dried soil composition.
    The main reservoir of soil fluoride seems to be industrial sites such as metal mines and filtration plants. However, natural fl uoride can often contributes as the reservoir, especially in some granite areas. Within granite, several % of biotite is contained as usual, and within biotite, less than 1 mass%of F-is contained in general. That is the reason why the natural fl uoride content tends to indicate relatively high in granite areas.
    The purpose of this study is to evaluate the expectable scale of soil contamination by the natural fluoride originated from granitic biotite. A detailed electron microprobe study of fluoride content (F-[mass%]) in biotite grains was performed on the 8 different kinds of medium-grained granite samples from 5 investigation sites in Hiroshima prefecture. The 5 investigation sites are Ohtake district (OH-1 and OH-2), Kake district (KA-1 and KA-2), Hiroshima district (HI-1 and HI-2), Kure district (KU-1) and Hongo district (HO-1) respectively. Each elemental analyse of biotites was obtained from polished thin sections using a JEOL JCMA-733 II electron probe microanalyser (EPMA).
    As results, fluoride content of biotite in granite is 0.5-1.3 mass%as biotite bulk composition. Converting to the in-soil fl uoride content following to the law, this value corresponds to several hundreds of mg/kg.
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  • Catalysis of Clays
    Masayuki SHIRAI
    2005 Volume 44 Issue 4 Pages 199-203
    Published: July 25, 2005
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.44.199
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