slagging of refractory

例句：

1. 1.The furnace was producing a lot of slag.
   炉子产生了大量的结渣。
2. 2. Slag is a byproduct of the smelting process.
   结渣是冶炼过程的副产品。
3. 3. The slag could be used as a fertilizer.
   结渣可以作为肥料使用。