Recovery of sodium compounds is important in the economy of the process. In modern kraft mills, operations are completely contained; waste streams are recycled and reused, eliminating water pollution.
钠化合物的回收在这种方法的经济效益中起重要作用。在近代的硫酸盐制浆厂中，操作过程是全封闭的；废液经回收处理后重复使用，消除了对水的污染。
Mineral compounds are made of elements such as sulphur, phosphorus, iron, potassium, sodium, and calcium.
无机化合物是由诸如硫、磷、铁、钾、钠和钙等元素组成。
The compounds, which include ammonia, carbon dioxide, carbon monoxide, sodium and, surprisingly, silver, could have come from the Earth, from the moon's interior, or from comets and asteroids.
这些物质,包括氨、二氧化碳、一氧化碳、钠时,让人吃惊的是,银,可能来自地球、月亮的内部,还是来自彗星和小行星。
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