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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>
Current Status of the Diagnosis and Management of Pancreatic Neuroendocrine Tumors in Japan
Tetsuhide Ito,Masami Miki,Keijiro Ueda,Lingaku Lee,Ken Kawabe,Hisato Igarashi,Nao Fujimori,Kazuhiko Nakamura,Kohei Yasunaga,Robert T. Jensen,Takao Ohtsuka,Yoshihiro Ogawa Korean Society of Gastrointestinal Cancer 2016 Journal of digestive cancer reports Vol.4 No.2
The epidemiology of pancreatic neuroendocrine neoplasms (PNENs) in Asia has been clarified through epidemiological studies, including one conducted in Japan, and subsequently another in South Korea. As endoscopic ultrasonography (EUS) has become more widely accessible, endoscopic ultrasound-fine needle aspiration (EUS-FNA) has been performed in pancreatic tumors for which the clinical course was only monitored previously. This has enabled accurate diagnosis of pancreatic tumors based on the 2010 WHO classification; as a result, the number of patients with an accurate diagnosis has increased. Although surgery has been the standard therapy for PNENs, new treatment options have become available in Japan for the treatment of advanced or inoperable PNENs; of particular note is the recent introduction of molecular target drugs (such as everolimus and sunitinib) and streptozocin. Treatment for progressive PNENs needs to be selected for each patient with consideration of the performance status, degree of tumor differentiation, tumor mass, and proliferation rate. Somatostatin receptor (SSTR)-2 is expressed in many patients with neuroendocrine tumor. Somatostatin receptor scintigraphy (SRS), which can visualize SSTR-2 expression, has been approved in Japan. The SRS will be a useful diagnostic tool for locating neuroendocrine neoplasms, detecting distant metastasis, and evaluating therapy outcomes. In this manuscript, we review the latest diagnostic methods and treatments for PNENs.
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>