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About 4 samples of effluent fume dusts from the LD pure oxygen refining process from 3 different localities in Japan were studied in the light of pneumoconiosis mineralogy an electron by mean of microscope and by micron photo-tub methods and X-ray powder methods and through differential thermal and chemical analysis. The following results have been obtained. (1) The particles of siderosis minerals in the effluent fume dusts and the sludges from the LD pure oxygen refining process are below 1 micron in size of iron oxide particulate matters. (2) The siderosis heavy minerals are below 0.1 micron in size, the siderosis light minerals are 1 micron to 0.1 micron in size of iron oxide particulate matters. (3) The pneumoconiosis mineralogical composition in the effluent fume dusts are maghemite (γ-Fe2O3) and Kokaneite(β-Fe2O3). (4) The pneumoconiosis mineraIogical composition in <0.1 micron in size of LD-sludges are magnetite(Fe3O4), hematite(α-Fe2O3), Kokaneite(β-Fe2O3), maghemite(γ-Fe2O3). (5) The pneumoconiosis mineralogical composition in 1 micron-0.1 micron in size of LD-sludges are goethite-hydrogoethite (α-Fe2O3·H2O·-α-Fe2O3·H2O·aq), akaganeite-hydroakaganeite (β-Fe2O3· H2O-β-Fe2O3·H2O·aq), lepidocrocite-hydrolepidocrocite (γ-Fe2O3·H2O-γ-Fe2O3·H2O·aq), hydro-magnetite (Fe3O4·aq), hydrohematite (α-Fe2O3·aq), hydrokokaneite (β-Fe2O3·aq), hydrgmaghemite (γ-Fe2O3·aq), green rust (1)-hydrogreen rust (1) (Fe3O4·2H2O (?)-Fe3O4·2H2O·aq (?)) 25), green rust (11)-hydrogreen rust (11) (Fe3O4·4/3 H2O (??)-Fe3O4·4/3 H2O aq (??))25), amorphous ferric oxide hydrate (Fe2O3·nH2O).

The Pneumoconiosis Mineralogical Study of the Effluent Fume Dust from the LD Pure Oxygen Refining Process in Japan