On the Sulfide Scale Growing upon the Inside Wall of Cast-Iron Pots for Sulfur-Smelting

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  • 鋳鉄製硫黄製錬釜内壁に生成する硫化物スケールに関する研究
  • チュウテツセイ イオウ セイレンガマ ナイヘキ ニ セイセイ スル リュウカブツ スケール ニ カンスル ケンキュウ

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Abstract

We investigated the sulfide scale formed upon the inside wall of ordinary cast-iron pots for sulfur-smelting. Upon microscopic observation of the sections (about 26 mm thick) and chemical and X-ray analysis at various positions of the scale, we obtained the following results: (1) The scale was mainly composed of pyrrhotite and Si was distributed all over the scale, but C was retained in the inner part as graphite. (2) The S content in the pyrrhotite determined by X-ray analysis was found in good agreement with that from chemical method, and rapidly decreased toward the sulfide/metal interface. (3) Cr seemingly moves toward the outer layer of the scale when its content is small. (4) Si as well as Fe and S were distributed periodically with identical intervals in the scale. But these phenomena may be attributed to another mechanism considered from the practical conditions.

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