金属炼炉的炉渣 slagSlag from a metal furnace
重金属冶炼废渣的利用 waste slag utilizationin in extractive metallurgy of heavy metals
金属和其他不能变成气体的无机材料，则会作为熔渣落到箱底。
Metals and other inorganic materials that do not turn into gas fall to the bottom of the chamber as molten slag.
金属以及其它不能转化为气体的无机材料会落在密室的底部，成为熔渣，冷却下来可以用来作砖或铺路。
Metals and other inorganic materials that do not turn into gas fall to the bottom of the chamber as molten slag. Once it has cooled, this slag can be used to make bricks or to pave roads.
用专业术语来说是Waelz渣，它主要由硅酸盐组成，但同样富含不受欢迎的有毒金属物质例如铅锌，所以处理有毒金属就成了个问题。
Waelz slag, to give its technical name, is composed mainly of silica but is also undesirably rich in poisonous metals like lead and zinc. Getting rid of it safely is thus a problem.
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