巻号一覧
58 巻, 686 号
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池田 謙三1942 年 58 巻 686 号 p. 361-362
発行日: 1942/06/22
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (702K) -
新庄 宗雅1942 年 58 巻 686 号 p. 363-373
発行日: 1942/06/22
公開日: 2011/07/13
ジャーナル フリーThe increase of production is the categorical imperative of the present war economy. Our mining industry is also making every effort to attain this end, but it must not be neglected that there, exist very difficult economic conditions such as shortages of labour and productive materials, while mining undertakings have economic characteristics as compared with undertakings in, ordinary industries. This suggests the special situation of the mining industry in the present war economy.
This article tries to give a theoretical concept of the special situation of the industry, by analysing the structure of profit of mining undertaking and the influences of the present economic conditions upon it.抄録全体を表示PDF形式でダウンロード (3322K) -
柏田 松三1942 年 58 巻 686 号 p. 374-385
発行日: 1942/06/22
公開日: 2011/07/13
ジャーナル フリーThe recovery of zinc and lead from regidues, obtained by leaching the are for zinc-electrolytic process, by a dry process involving volatilization of zinc and lead in a rotary kiln-i e. Waelz process-has been operated in practice at Nippon Soda Co. Aizu work. The plant consists of a drier 18.2m in length and 1.8m in outer diameter, a rotary kiln 30 m in length and 1.6m in inner diameter and two Cottrell electrical precipitators.
The writer has been engaged in this operation for several years and gained the following conclusions;
1. When the residues contain 6 per cent of lead and 15 per cent of zinc, the yield amounts to 95 per cent for lead, to 87 per cent for zinc.
2. In the above case, the products contain 19 per cent of lead and 48 per cent of zinc.
3. It is preferable, technically and also economically, to control the moisture of charge into the kiln between 13 per cent to 15 per cent.
4. The amount of cokes for suitable operation being 35 to 40 parts for 100 parts of dry ores; the amount of coal for auxiliary heat source being 5 to 10 parts.
5. The percentage composition of the gaseous mixture leaving the kiln found to be 18.50 % CO2, 81.22% N2, 0.08% SO2, 0.2% O2 and none CO.
6. The temperature, inside of the kiln, varies by space and also there found considerable difference between gas, charge and lining brick.抄録全体を表示PDF形式でダウンロード (4568K) -
山根 新次1942 年 58 巻 686 号 p. 386
発行日: 1942/06/22
公開日: 2011/07/13
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廣川 治1942 年 58 巻 686 号 p. 387-391
発行日: 1942/06/22
公開日: 2011/07/13
ジャーナル フリー流動液中では, 結晶は流れに面する側に最も急速に生長する. 此れは供給物質が溶液自體の運動により, 又擴散によつて結晶の此の側に運搬される爲である. 然るに結晶の背衝側 (lee side) に於ては, 供給物質は大部分擴散によつてのみ運搬される. かくして溶液の移動方向は屡々鑛物の生長累帶 (growth zone) の觀察により決定される. 此の觀察は通例鑛物の斷面を作つて行はれる. 流線があればそれも選擇成長 (preferred growth) の方向を定めるに役立つ. 結晶の歪形も又役立つであらう. 鑛物の第面に附着せる小結晶の作る表面連晶も又良き證據となる. 鑛物個體或は鑛物聚合體の選擇溶蝕, 若しくは溶解もこれに類似してゐる. 鑛物自身のもつ方向性は或程度まで干渉してくる.
人工結晶及び多數の鑛物鑛石に就て此等の關係を研究した. 以下實驗的研究及び鑛物及鑛石に見られる實例につき簡單に記述しやう.抄録全体を表示PDF形式でダウンロード (4083K) -
1942 年 58 巻 686 号 p. 392-395
発行日: 1942/06/22
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1039K)
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