1. Rare earth original mine, final mine, tailing mine and scoria were formed in the course of produce and letting. 稀土在生产和排放过程中形成的原矿、精矿、尾矿和矿渣都含有一定量的汞、铅和钍。
2. Scoria silicate cement: By silicate cement grog, right amount bead changes interfuse to blast furnace scoria reaches gesso mill and be become. 火山灰质硅酸盐水泥： 由硅酸盐水泥熟料和火山灰质材料及石膏按比例混合磨细而成。
3. When lightweight aggregate concrete is prepared, scoria is mixed in as the coarse aggregate, while steel fibers, polypropylene fibers and hybrid fibers are added respectively. 用天然火山渣作为粗骨料，配制钢纤维、聚丙烯纤维和混杂纤维轻骨料混凝土。
英英解释
n.
1. the scum formed by oxidation at the surface of molten metals
