The other half comes from calcination, the chemical reaction that transforms limestone into clinker.

另一半则来自煅烧过程，即将石灰石转为熟料的学反。

Limestone is refined to produce calcium oxide, or quicklime, for cement, in a reaction known as calcination, which releases a lot of carbon in the form of CO2.

石灰石被提炼以产用于水泥的氧石灰， 在称为煅烧的反中，该反以 CO2 的形式释放大量碳。

Around half the carbon dioxide emissions from cement making come from the calcination reaction alone, the rest coming mainly from quarrying the limestone and heating the kiln.

大约一半的水泥产过程中的二氧碳排放仅来自煅烧反，其余主要来自开采石灰石和加热窑炉。

Then a reaction takes place inside the Kiln known as calcination which produces carbon dioxide is a by-product.

然后在窑内发称为煅烧的反，产的副产品是二氧碳。

A chemical reaction called calcination drives the carbon from the limestone, producing lime.

一个称为煅烧的学反将石灰石中的碳驱除，产石灰。