微粉炭灰の超微粒子に群に関するに研に究
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The ultrafine particles in the ashes of burnt pulverized coal are man made minerals, They are the product of burnt pulverized coal used as fuel in modern power plants. About 25 samples of the raw coals and their ashes produced by pulverizing and burning them were collected from 5 different modern power plants in Japan and were studied in the light of pneumoconiosis mineralogy by means of an electron microscope, and by micron photo tub methods and X ray powder methods, and through differential thermal and chemical analyses and Spectrum analyses.<BR>The following results have been obtained.<BR>(1) The particles of pneumoconiosis minerals in pulverized coals are from 10 to 0.5 micron in size. Their pneumoconiosis mineralogical composition is of non crystalline Carbon and clay minereals in kaoline group and quartz.<BR>(2) The particles of pneumoconiosis minerals in the ashes of burnt pulverized coal are from 5 to 0.5 micron in size, and all spherical in shape. Their pneumoconiosis mineralogical composition is of non crystalline alumino silicates and mullite, quartz and feldspar.<BR>(3) Pulverized coal yields 6-10% volume of ashes by burning.<BR>(4) The volume of SiO2 found in the ashes of burnt pulverized coal varies in proportion to the volume of the ashes.<BR>(5) Fe<SUB>2</SUB>O<SUB>3</SUB>. Al<SUB>2</SUB>O<SUB>3</SUB>. CaO. MgO. R<SUB>2</SUB>O and MnO are found in the ashes of burnt pulverized coal in volume respectively in inverse proportion to the volume of the SiO<SUB>2</SUB> in the ashes.<BR>(6) B<SUB>2</SUB>O<SUB>3</SUB> is contained in volumes in the ultrafine particles below 1 rnicron in the ashes of burnt pulverized coal, varying in.inverse proportion to the volume of the ashes.
- 社団法人 日本材料学会の論文
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