著者

崔 亨燮 呉 在賢

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.82, no.941, pp.755-762, 1966-09-25 (Released:2011-07-13)

参考文献数

30

---

To study the correlation between the characteristics of fracture surface and the electrochemical properties of aluminum-silicate minerals, cleavage planes of kyanite, andalusite and sillimanite have been predicted from crystal structures of these minerals, and then the arrangement of atoms exposed to the surfaces along these ckavage planes have been assumed.The electrochemical phenomena of these minerals in the solid-solution interface are discussed with respect to the weighted average charge per metallic atom on the assumed cleavage planes. The weighted average charge has been calculated as a function of oxidation number of the metals and number of oxygen atoms coordinated to these metallic atoms.It is found that the pH of the isoelectric point of kyanite, andalusite and sillimanite decreases as the weighted average charge increases. Together with the above three minerals, corundum and quartz are found to be in good linear relation between the pH of the isoelectric point and the weighted average charge, indicating that the arrangement of metallic atoms on the fracture surface of minerals plays an important role upon their surface properties.The effect of surface oxygen atoms on the pH of the isoelectric point of minerals is also discussed briefly.

著者

李 孝淑 康 南基 呉 在賢

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.110, no.4, pp.297-302, 1994-04-25 (Released:2011-08-04)

参考文献数

9

被引用文献数

2 2

---

水溶液中における磁鉄鉱生成の機構を明らかにするために, 本報では先ずFe (OH) 2懸濁液の酸化条件による磁鉄鉱生成の速度ならびに生成粒子に関して調べた。それからFe (OH) 2懸濁液に三価鉄を理論量だけ加えると粒径100Å前後の磁鉄鉱が瞬間的に生成されることがわかった。Fe (OH)2とFe(OH)3の適定試験における溶液の色の変化ならびに適定曲線と三価鉄の影響をあわせ考え次のような固体-固体反応による磁鉄鉱の生成機構を導出した。Fe (OH)2(s)+2Fe(OH)3(s)→Fe3O4 (s)+4H2O