<Originals Papers>Studies on Electrolytic Refining of Zinc. (Part 1) : The Solubility of Lead in Zinc Sulfate-Sulfuric Acid Electrolyte

The solubility of lead in zinc sulfate-sulfuric acid electrolyte was determined over the range of zinc concentration from 30 to 120g/l, acid concentration from 50 to 300g/l, and at the temperature of 30°, 40°, and 50℃. For each of the solubility determinations lead sulfate was wetground with a little electrolyte and transferred to a 80ml portion of the latter in a stoppered 100ml conical flask. The electrolyte was mechanically stirred for 24 hours and then allowed to stand for 2 hours at a constant temperature of 30°, 40°, and 50℃ respectively. 5ml of the electrolyte was then taken as a sample and lead was extracted by dithizone in chloroform. The quantity of lead present in the dythizone solution was measured with Fisher Nefluoro Photometer through the 525mμ filter. The solubility of lead in zinc electrolyte is mainly affected by the free sufuric acid concentration and the temperature. It decreases with increase in acid concentration, increases with rise in temperature, and is scarcely affected by zinc concentration. The relationship between the lead solubility and the free sulfuric acid concentration is given by the following expression logy=a+bx where y is the concentration of lead, mg/l, x is the free sulfuric acid concentration, in g/l unit, a and b are constants which may be evaluated from zinc concentration and temperature of the electrolyte. Rise in temperature results in an increase of 0.11～0.16mg Pb/℃

<Original Papers>Recovery of Elemental Sulphur from Iron Sulphide Ores by Roasting in SO_2 Atmosphere

For recovery of elemental sulphur and iron oxide suitable for pig iron production, the reaction [numerical formula] might be considered as possible. Powdered pyrite assayed at 95% FeS_2 was roasted in the atmosphere of SO_2+N_2 in a fluidized roasting furnace, of which the reaction tube made of 18% Cr steel was 10 cm in diameter and 1 m in hight. In fluidization, the reaction of FeS with SO_2 was controlled by chemical reaction itself on the surface of FeS. Arrhenius plot gave a staight line, indicating that the energy of activation was about 22 kcal/mol. The composition of gas mixture which circulated through cyclones, a sulphur condenser, a bag filter and a preheater had no effect on the reaction rate in the range higher than 50% SO_2. The reaction was slow at the temperature lower than 750℃, but when the temperature was raised to 900℃ or higher, sintering occurred. When the ore was fed constantly and the experiment was continued for 6 hours, the residual sulphur in the roasted ore reached 4～8%

<Original Papers>Studies on Electrolytic Refining of Zinc. (III) : Behavior of Lead Peroxide Suspended in Zinc Electrolyte

To determine the effect of lead peroxide dispersed in electrolyte on the lead content of cathode zinc, the following investigation was conducted. For comparison with results in the previous work, experiments were carried out in the same manner as the previous one except the use of pure lead or 1% Ag alloy anode and the variation of the amount of lead peroxide kept in suspension. By comparing with the previous results it was found that the lead peroxide was occluded to the cathode zinc, as is well known as the major course of zinc contamination. In some examples, an assumption was made on the ratio of lead quantities transferred to zinc from lead ion deposition and from the occlusion of lead peroxide respectively. Results are summarised in the following four points : (1) Distribution of lead on the cathode surface depends on the amount of lead peroxide in suspension. When its quantity is large, lead distribution is not uniform, contaning more lead in the surrounding part ; on the other hand, when less quantity of lead peroxide is dispersed, the result approches to that of lead ion deposition only. (2) At low current dencity the influence of lead ion deposition is intensified, while at high current dencity the occlusion of lead peroxide is accelerated with increasing electrolyte agitation by bubbles. (3) Rising temperature is favorable to increasing lead ion concentration, and furthermore, the occlusion of lead peroxide. High current density accelerates the influence of elevated temperature. (4) It is impossible from comparison with the previous results to presume the contamination course of zinc in all runs except in some examples, because the lead peroxide particles dissolve relatively easily while electrolysis is going on

<Original Papers>Studies on Electrolytic Refining of Zinc. (IV) : Courses of Lead Transferred to Cathode Zinc

To elucidate the courses of lead coming into the cathode zinc, comparison was made with the lead content of zinc deposited to two cathodes of which one was enclosed in an unglazed cylindrical alumina diaphragm and the other was directly immersed to electrolyte suspending reasonable amount of lead peroxide particles. Electrolyte solution was forcibly circulated through the diaphragm to prevent growth of difference between electrolyte constituents, especially lead ion concentration, of both sides of diaphragm. The lead distribution between lead ion deposition and lead peroxide occlusion was decided by comparing results of these two cathodes. The ratio of lead quantity caused by lead ion deposition to the total amount of lead in the cathode zinc was much higher beyond our expectation. The ratio of lead ion deposition increased with increase in lead ion concentration of electrolyte solution and with decrease in amount of dispersed lead peroxide particles and in electrolyte temperature. The total lead content of cathode zinc takes the minimum value at the some current density which varies with correlation between lead ion concentration and the amount of dispersed lead peroxide, and with other electrolysis conditions. At that current density, it was found that the respective lead quantity that comes into cathode passing through the different course was just same. In higher range than that current density, the occlusion of lead peroxide is the predominating factor in contamination course of zinc, but at a less current density, cathodic contamination is due mainly to the deposition of soluble lead. From comparison of both contamination ratios of lead ion deposition and lead peroxide occlusion, it was found that we had to pay the same attention to lead ion deposition as to the lead peroxide occlusion

固相に担持されたニトロピリジンスルフェニル型チオール選択的標識試薬の創製とペプチド合成への応用

東京薬科大学2016年

<Original Papers>A Fundamental Study on the Pyrometallurgical Debismuthizing of Lead.(I) : Thermodynamic Study of the Pb-Bi System

This study was carried out to investigate the lead-bismuth-sodium ternary system which forms a basis of the Dittmer method as a part of "the fundamental study of pyrometallurgical debismuthizing of lead." Thermodynamic properties of liquid Pb-Bi binary system were determined by emf measurement of galvanic cell of the form Pb/Pb^ (in KCl+LiCl)/Pb (Pb-Bi solution). Activity curve of respective component of lead and bismuth shows small negative deviation from ideality. The excess integral molal entropy change is near to zero in all range and the solution can be taken as the regular solution even though Darken\u27s function is not strictly constant

アンポ ケンポウ アジア ヨトウナイ タイリツ ト ヨヤトウカン タイリツ

The　Conflict　about　the　Japan　U．　S．　Security　Treaty（JUSST）is fought　between　the　Liberal　Democratic　Party（LDP）and　the　Japan Socialist　Party（JSP），　though　disagreement　about　the　Constitution emerged　within　the　LDP，　Some　LDP　members　support　Taiwan， while　others　support　the　People’s　Republic　of　China．　Postwar settlement　was　not　discussed　until　the　1980s．　These　inconsistent partisan　divisions　d6n’t　fit　with　the　conventional　right－left　ideology． These　issues　differ　not　only　in　terms　of　partisan　division　but　also the　policy　dimension；the　JUSST　and　the　China　problem　are concerned　with　the　Cold　War　dimension，　while　the　Constitution　and postwar　settlement　are　related　to　the　stateness　dimension．　Since　the Cold　War　dimension　is　more　salient　than　the　stateness　dimension， the　partisan　division　on　that　issue，　the　LDP　vs．　the　JSP，　was　fixed in　1955．　As　a　result，　issues　of　the　Constitution　and　postwar settlement　have　never　been　solved

Variations in portal and hepatic vein branching of the liver

The present study provided an overview of the Couinaud’s segmentation system of the portal and hepatic veins, the controversies surrounding it and the typical variations the anatomy of the portal and hepatic veins. Even with the advent of three-dimensional CT (3DCT), it goes without saying that a basic knowledge of Couinaud’s classification is essential. Future advances in technology are expected to enable the superimposition of preoperative 3D images and intraoperative real-time ultrasound images. Looking forward, a secure knowledge of the fundamentals of liver anatomy is necessary for patient safety during liver transplantation or R0 resection, in which the tumour is not exposed. (Kimura in Kan Tan Sui Gazo 13: 355-363, 2011