Instead, up to 30% of its weight could be slag—the toxic gunk left over when steel is made.

，高达30%的重量可以是矿渣，这是一种在制钢过程中产生的有毒废料。

A dam broke on Friday causing mud and mining debris to flood into the city and in other parts of the region.

上周五，一座大坝决堤，导致泥浆和矿渣涌入城市和该地区的其他地方。

The workers wore sleazy working clothes to carry slag and slate.

工人们穿着地薄的工作服工找矿渣和板岩。

The results: concrete slugs made with ingredients like fly ash and slag held up remarkably well after more than a month.

成分为粉煤灰和矿渣的混凝土塞在一多月以后依旧保持完好。

Now, the part of ejected scoriae and ashes seemed to my mind a very rough one to act.

现在，喷射出的矿渣和灰烬的部分在我看来是一粗糙的表演。

The solution? Novel blends of concrete that use cheap leftover materials from the coal and steel industries: fly ash, silica fume and slag.

有解决方法吗？使用粉煤灰、硅粉和矿渣等来自钢铁工业的廉价剩余材料制造新的混凝土。

This uses calcium extracted from slag (a traditional waste product) and combines it with CO2 captured from blast-furnace gas to make high-quality calcium carbonate, which the startup plans to sell as a food ingredient.

该公司利用从矿渣（一种传统废品）中提取的钙， 并将其与从高炉煤气中捕获的二氧化碳结合， 制成高量的碳酸钙，该初创公司计划将其作为食品原料出售。