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

半则来自煅烧过程，即将石灰石转化为熟料的化学反应。

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化钙或石灰， 在称为煅烧的反应中，该反应以 CO2 的形式释放大。

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.

大约半的水泥产过程中的二氧化排放仅来自煅烧反应，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应，产的副产品是二氧化。

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

个称为煅烧的化学反应将石灰石中的驱除，产石灰。