磷酸盐岩是富钴结壳老壳层的主要组分之一。

Phosphorites are the main components in the old layers of the Co-rich crusts.

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我们使磷酸盐岩同硫酸发生化学反应制造过磷酸钙。

We make superphosphate by reacting rock phosphate with sulphuric acid.

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本文对来自中太平洋海山的三块富钴结壳样品中的磷酸盐岩进行了研究，以期对富钴结壳形成环境的变化有所了解。

They were studied in three Mid-Pacific seamount Co-rich crusts to probe into changes of the Co-rich crusts' forming environment.

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