The rate of iron recovery of pyrite cinders is up to 90% by maturation treatment after pyrite cinders mixing with sulfur acid.

将硫铁矿烧渣与硫酸混合后，经过熟化处理可使烧渣中铁的回收率达到90%以上。

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The wet process consisted of roasting, sulfur acid pretreatment and chlorination leaching of gold is examined. The results show that gold leaching rate is 97.95% and silver leaching rate is 79.86%.

本研究采用焙烧-硫酸预处理-氯化湿法工艺从其中回收金，金浸出率为97.95%，银浸出率为79.86%，效果令人满意。

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Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.

二氧化硫是酸雨的主要成因之一，它是一种特别严重的污染物，因为它会降低呼吸系统处理其他污染物的能力。

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Ferretti, vice president at the Chicago Climate Exchange, extolled emissions trading, noting that the practice had helped bring sulfur dioxide and acid rain under control much less expensively than traditional command-and-control regulation.

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However, it is also applicable in locations where smelter acid is not available by the purchase of sulfuric acid or the manufacture of sulfuric acid from sulfur or pyrite.

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Back then, the concern was sulfur dioxide, the culprit behind acid rain.

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