In this country, the flue-dust of copper smelters always includes more or less elementary sulphur besides combined sulphur as a result of adoption of pyritic smelting principle. Such flue-dust may have explosibility which is increased in strength with the increase of sulphur content.
Actual accidents, of explosion have been reported in several places. For the purpose of preventing those accidents, . the auther has been studying about the explosibility of both actual and synthetic sulphureous dust. By the explosion diagram proposed by the auther, it is possible to divide the field into two ranges, the explosion and nonexplosion range, by the amount of elementary sulphur.
If the sulphur content is less than about 20%, the dust has no explosibility even at the presence of inflammables. Therefore, if we can limit the sulphure content under 20%, there will be no explosion any more, fortunately, the above limit of sulphur, less than 20%, can be maintained in the actual operation without great difficulty
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