フラッシング法による粘土中の微細硫化鉄の除去

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The flushing process was developed to achieve high purification of Roseki and kaolinite raw clays which contain abundant pyrite as impurity. Extraction of fine pyrite particles employing kerosene from clay slurry was performed with high efficiency by mechanical liberation of sulfide particles from silicates and by controlling the properties of particle surface and slurry solution. The latter chemical conditioning for dispersion of particles and hydrophobicity of pyrite in the slurry was very important factor which influenced the separation efficiency, since the fine pyrite particles in the clay once digged out tend to be easily oxidized and flocculated strongly with clay particles. By addition of separation-promotive agents such as reducing agent, chelating agent and surface active agent (collector), the dispersion of the slurry was increased remarkably because of elimination of influence caused by oxidized product of pyrite. With the clay samples containing a large amount of pyrite and resulting in increased oxidation, rejection of whole solution of the slurry in which much amount of iron ions was dissolved was necessary to satisfy the optimum conditions for higher sulfide extraction. Thus pyrite rejection from Okayama Roseki and Shiraoi kaolinite samples reached at over 90% respectively by the second step extraction. Pyrite showed the most appropriate condition for removing at pH 3-4 with the presence of sodium citrate, where citrate ions acted not only as a chelating agent for dissolved iron ions but also as a dispersant for clay sllurry because of adsorption on clay surface.
日本粘土学会の論文
1984-10-25

フラッシング法による粘土中の微細硫化鉄の除去

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