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早在五十年代,就做了大量在冲天炉中使用CaC~2的工作。随后在冲天炉基本工艺方面产生了三个重要改进:1．二次(双层)送风;2．富氧送风;3．1973年制成以焦末和混合煤为原料的优质合成焦炭。
As early as the fifties, a great deal of work was done using CaC ~ 2 in the cupola. Then there are three important improvements in the basic craft of the cupola: 1. Secondary (double) air supply; 2. Oxygen-rich air supply; 3. 1973 made of coke and mixed coal as raw material quality synthetic coke.