巻号一覧
48 巻, 572 号
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渡邊 俊雄1932 年 48 巻 572 号 p. 1269-1274
発行日: 1932/12/22
公開日: 2011/07/13
ジャーナル フリーHydrometallurgy of Tin Ores. The new process developed by the author and his assistant, Mr. A. Nomitsu, consists of...(a) prefential reducing roasting, in which SnO2 is reduced to metallic Sn, and Fe2O3 to FeO or Fe3O4;(b) leaching with CUSO4 solution to displace Cu with Sn in the roasted ore; followed by (c) electrolysis of SnSO4 solution. The CuSO4 solution will be regenerated from effluent solution of the electrolytic cell and Cu in the leached residue.
New Process for Manufacturing Cuprous Oxide. Cement copper and copper liquor containing CuC12, both of which are obtained as intermediate products in the Ramenia plant, are used as starting materials. By mixing them, CuCl is easily precipitated. The CuCl thus produced is digested in slightly acidified water and is kept at a. temperature near the boiling point. By adding slowly into this hot solution the finely powdered salt of weak basicity such as limestone, sodium acetate, &c., we get the deep red precipitate of Cu2O. This process is already adopted at the Osaka Seiren Company and the products is on the market. Mr. S. Awazu, assistant of the author, and Mr. S. Kojima, engineer of the company have made many contributions to develop this process.
Precipitation of Gold and Silver from Cyanide Solution by Active Carbon. Bone charcoal, and charcoal from begasse and bamboo when used after activating, are good adsorbents of Au and Ag, though Ag is less apt to be adsorbed than Au, The presence of a small quantity of K3FeCy6, KCNS, &c. in the solution promotes considerably the adsorption of Au and Ag, while free cyanide retards it. Ag is more easily adsorbed by these carbons when it coexists with Au, than when it presents itself singly. These experiments were made by Mr. H. Itomi, assistant of the author in accordance with his suggestions.抄録全体を表示PDF形式でダウンロード (900K) -
木村 唯助1932 年 48 巻 572 号 p. 1275-1288_1
発行日: 1932/12/22
公開日: 2011/07/13
ジャーナル フリーStates of copper concentration and microscopical structures of kernels in calcinect chalcopyrite have been studied. The writer observed that, when a chalcopyrite particle roasted, whatever the size may be, the enrichment of copper component in the unroasted portion would occur, even as finer as -325 mesh particles. The structure of kernel in calcined chalcopyrite changes, Chalcopyrite-Bornite solid solution, Bornite, Bornite-Chalcocite solid solution and Chalcocite, successively by the roasting proceeds. From these observation and the tests of diffusion between chalcopyrite and chalcocite, the writer has attributed to the diffusion of copper and iron sulphides that the concentration of copper in kernel takes place, viz., free copper sulphide molecules which were turned out by roasting, diffuse into the unroasted portion and takes place the unbalance of Cu and Fe concentration in the unroasted portion and inward movement of copper sulphide and outward movement of iron sulphide. It has also found that copper ferrite walls are produced on the outer ring of the kernel, and the difficulty of roasting and magnetic property of kernel are due to this copper ferrite wall.抄録全体を表示PDF形式でダウンロード (13875K) -
小川 芳樹1932 年 48 巻 572 号 p. 1289-1296
発行日: 1932/12/22
公開日: 2011/07/13
ジャーナル フリーWith a view of acquiring a closer insight into the factors which affect the current efficiency of deposition of zinc from sulphate solutions, the writer started with the electrolysis of pure solutions, using platinum anodes in order to get rid of the effect of lead which is usually neglected. The influences of the rise in temperature was studied as well as those of the variation in the composition of the electrolytes, the current density and the speed of agitation.(The temperature ranged from 30°C to 80°C.) Where the impurities are absent, the causes of the lowering of the current efficiency should be sought in the simultaneous discharging of H ions with Zn, but not in the so-called chemical corrosion of the Zn already deposited. The phenomena observed were explained from this standpoint.抄録全体を表示PDF形式でダウンロード (1176K) -
石田 四郎1932 年 48 巻 572 号 p. 1297-1313
発行日: 1932/12/22
公開日: 2011/07/13
ジャーナル フリー(1) As the results of studying the mechanical properties of extruded magnesium alloys, following facts are obtained. Their tensile strength, proportional limit, modulus of elasticity etc. are, respectively, nearly equal to two-third of that of Duralumin, but shock value is a little smaller than this ratio. In spite of these facts, fatigue strength is almost equal to, or a little larger than that of Duralumin. Thoughness is almost unvaried in the range of temperature from 20°Cto-50°C.
(2) During, one year, corrosion properties of magnesium alloys were tested at the seashore in Tokyo Bay. Before weathering, tensile test pieces of magnesium alloys are previously protected against corrosion by one of the following films, i.e., urushi, coal tar, chromic acid, our patented oxide film and the patented film of the Aichi Watch and Electric Tool Co. The last two films were also covered with ethyl benzol cellulose containing Aluminium fine powder. As the result of tensile test after weathering during 3, 6, and 12 months, no dangerous corrosion was found.抄録全体を表示PDF形式でダウンロード (13645K) -
1932 年 48 巻 572 号 p. 1314-1320
発行日: 1932/12/22
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1025K)
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