Daim ntawv thov: Lub tshuab no yog hom tshiab ntawm kev ua haujlwm siab thiab txuag hluav taws xob sib nqus sib nqus haum rau cov siv sib txawv. Feem ntau yog siv rau cov hlau seem, steel slag hlau, ncaj qha txo cov hlau cog hlau, hlau foundry hlau thiab lwm yam metallurgical slag hlau.