Carbon monoxide is the raw gas of many synthesized chemical products, but in some other chemical reactions it can make the catalyzer invalid and is the detrimental impurity in industrial gases.
一氧化碳是合成许多重要化工产品的原料气体，同时一氧化碳在有些工业气体中是有害杂质，能使催化剂中毒。
A key to ore dressing of quartz sands includes rude ores of high or low quality, occurrence and distribution of detrimental impurity such as iron and aluminium in size grades of placer deposits.
石英砂原矿质量的优劣，有害杂质铁、铝的赋存状态及其在各粒级砂矿中的分布，是决定选矿效果的关键。
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