著者

井上 博文 重野 芳人 徳田 昌則 大谷 正康 東口 方也 本吉 実 松永 久 児玉 文男 大矢 龍夫 別所 永康 中西 恭二 江島 彬夫 石坂 邦彦 数土 文夫 香月 淳一 川名 昌志 安藤 遼 中谷 元彦 川見 明 池田 隆果 松尾 亨

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.64, no.2, pp.A17-A36, 1978-02-01 (Released:2010-03-15)

被引用文献数

4

著者

石垣 政裕 張 晶 徳田 昌則

出版者

東北大学東北アジア研究センター

雑誌

東北アジア研究 = Northeast Asian studies (ISSN:13439332)

巻号頁・発行日

no.2, pp.75-87, 1998-03-31

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China has developed into one of the biggest energy consumers in the world. The heavy industries have gained prominence. Coal covers 76% of the primary energy supply. The industrial structure and the sulfur oxide emissions from the sulfurous-coal energy are a major environmental concern. Heavy industries alone are responsible for 72% of the total SO_2 emission into the environment. The pollution in the industrial areas is remarkably high. The air-pollution control has so far focussed on dust and particle emissions only. Little or no measures have been taken to control SO_2 emissions. The following measures need to be taken to effectively control the problem of air pollution. 1. Implementation of Laws that insure public health against damage caused by pollution 2. Economically, it will be advantageous to offer incentives to industries to take pollution control measures, e.g. to install desulfurizing devices. 3. Technologically, it is necessary to develop the required desulfurizing devices compatible to local economic conditions or, to introduce the related know how from some other countries.

著者

梅津 良昭 李 自強 徳田 昌則

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.47, no.1/2, pp.58-65, 1991-12-27

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Thiourea leaching of silver sulfide was studied in weakly acidic sulfate solutions containing ferric sulfate as a moderate oxidant. In the presence of ferric ions, the sulfide sulfur was converted into elemental sulfur and the silver was extracted as its thiourea complex ion, Ag(NH_2CSNH_2)_3^+. In the leaching without oxidant, silver sulfide was leached according to the H_2S forming reaction, where the elimination of H_2S from the leach liquor, for instance by nitrogen gas flow, significantly favored the leaching. In the both cases, the presence of thiourea was necessary for the extraction of silver from the sulfide. The moderate leaching conditions such as fairly low acid concentration at a level around 0.06mol/l and the operation temperature not higher than 50℃, and a high concentration of thiourea promoted the silver extraction mainly due to the increased stability of the thiourea complex ion of silver. It was also observed that silver sulfide was easily extracted in the oxidative thiourea leaching where sulfide ore consisting mainly of pyrite, arsenopyrite, stibnite and chalcopyrite coexisted.

著者

李 正吉 伊藤 公久 徳田 昌則

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.44, no.2, pp.237-245, 1989-03-25

著者

徳田 昌則 吉越 英之 大谷 正康

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.56, no.14, pp.1899-1915, 1970-12-01 (Released:2010-10-12)

参考文献数

123

被引用文献数

21 9