蛋壳的矿物质几乎为纯碳酸钙，还有一些镁，形成放射状结晶。

The mineral of the shell is almost pure calcium carbonate, with some magnesium, formed of radiating crystals.

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在循环冷却水系统中，最常见的难溶盐或微溶盐有碳酸钙、硫酸钙、磷酸锌及硅酸镁等。

In the cooling water system, the most common scale is carbonate, sulphate, phosphate, silicate.

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该工艺将矿石通过煅烧、分离、碳化、焙烧等过程，加工成镁、碳酸钙和复合肥。

This technology changes the ore into magnesium, calcium carbonate and compound fertilizer through calcination, separation, carbonization and roasting.

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