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Removal of Trace Impurity from Limestone Using Flotation Techniques
Tsunekawa, Masami,Honma, Yugo,Yoo, Kyoungkeun,Hiroyoshi, Naoki,Ito, Mayumi The Japan Institute of Metals 2009 MATERIALS TRANSACTIONS Vol.50 No.1
<P>High grade limestone was obtained by removing trace impurities through reverse and carrier flotation techniques. A simple method for measuring the impurity content of limestone was developed by correlating the amount of impurities and the turbidity of suspensions of residue from limestone dissolved in 20% acetic acid.Impurity removal more than 50% with limestone recovery better than 85% was obtained under suitable conditions by both reverse flotation and carrier flotation using sodium oleate (NaOl) and dodecylammonium acetate (DAA) as collectors. Limestone containing more than 0.15 mass% impurity was used as the carrier. These results suggest that limestone treated by flotation can be used as high quality limestone in paper manufacturing.</P>
Dispersion-Flocculation Behavior of Fine Lead Particles in an Organic Solvent
Tsunekawa, Masami,Sasaki, Yuta,Nakamura, Yoshiaki,Ito, Mayumi,Hiroyoshi, Naoki,Yoo, Kyoung Keun The Japan Institute of Metals 2008 Materials transactions Vol.49 No.9
<P>Methyl ethyl ketone (MEK) is a good solvent for polyvinyl chloride (PVC) and it has been proposed for use in PVC recycling. In the recycling process, fine particles of 3PbO·PbSO<SUB>4</SUB>·H<SUB>2</SUB>O, used as a thermal stabilizer in PVC products, are dispersed and not dissolved in the solvent. To establish methods for removing of 3PbO·PbSO<SUB>4</SUB>·H<SUB>2</SUB>O particles from the solvent, factors affecting the dispersion-flocculation behavior of the particles in MEK were investigated.The zeta potential and particle distribution of 3PbO·PbSO<SUB>4</SUB>·H<SUB>2</SUB>O particles in MEK solutions containing known amounts of H<SUB>2</SUB>O were measured. Above 5 vol%H<SUB>2</SUB>O in MEK solutions, the zeta potential of 3PbO·PbSO<SUB>4</SUB>·H<SUB>2</SUB>O particles approached zero and the flocculation of particles was achieved. In addition, it was found that Pb<SUP>2+</SUP> and Cl<SUP>−</SUP> affect the zeta potential of the particles. These results indicate that the dispersion-flocculation behavior of lead particles can be influenced by the concentration of H<SUB>2</SUB>O, Pb<SUP>2+</SUP>, and Cl<SUP>−</SUP> in MEK.</P>
Removal of Mn Ions by Biological Co-precipitation of Fe Ions
유경근,Naoki Hiroyoshi,Masami Tsunekawa 한국자원공학회 2010 Geosystem engineering Vol.13 No.3
The behaviors of manganese ions during biological precipitation of iron ions by Acidithiobacillus ferrooxidans was investigated to remove the Mn ions from acid mine drainage. The effect of initial Fe2+ ion concentration with 900g․ m-3, 4500 g․ m-3, and 9000 g․ m-3 on the removal of Mn ions was examined by measuring pH, ORP, and the concentrations of Fe and Mn ions. In the experiments with the Fe2+ concentration with 4500 g․ m-3 and 9000 g․ m-3, pH increased and then decreased by the oxidation of Fe2+ and the precipitation of Fe ions. In all solutions, ORP increased to 630 mV, and Fe concentration decreased with Fe precipitation. Adding NaOH increased the amount of Fe precipitate and the Mn removal ratio in the early stage but there was no significant effect as the experiments were proceeded.
Removal of Mn Ions by Biological Co-precipitation of Fe Ions
Yoo, Kyoung-Keun,Hiroyoshi, Naoki,Tsunekawa, Masami 한국암반공학회 2010 Geosystem engineering Vol.13 No.3
The behaviors of manganese ions during biological precipitation of iron ions by Acidithiobacillus ferrooxidans was investigated to remove the Mn ions from acid mine drainage. The effect of initial $Fe^{2+}$ ion concentration with $900g{\cdot}m^{-3}$, $4500g{\cdot}m^{-3}$, and $9000g{\cdot}m^{-3}$ on the removal of Mn ions was examined by measuring pH, ORP, and the concentrations of Fe and Mn ions. In the experiments with the $Fe^{2+}$ concentration with $4500g{\cdot}m^{-3}$ and $9000g{\cdot}m^{-3}$, pH increased and then decreased by the oxidation of $Fe^{2+}$ and the precipitation of Fe ions. In all solutions, ORP increased to 630 mV, and Fe concentration decreased with Fe precipitation. Adding NaOH increased the amount of Fe precipitate and the Mn removal ratio in the early stage but there was no significant effect as the experiments were proceeded.