calcination

例句：

1. 1. The process of calcination is essential for the production of steel.
   炼钢过程是生产钢铁所必需的。
2. 2. The calcined bricks were used as a building material in ancient times.
   古代用煅烧过的砖作为建筑材料。
3. 3. During the calcination process, the coal is heated to high temperatures and transformed into gaseous products.
   在煅烧过程中，煤炭被加热到高温并转化为气体产物。