1.
the desired mineral that is left after impurities have been removed from mined ore.
开采的矿石去掉杂质后剩余的有用矿物。
2.
We had to work off the impurities.
我们得把杂质去掉。
3.
discard the siftings
把筛下来的杂质丢掉
4.
To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.
据说煤中掺有石子和其它杂质须去掉时，至今仍得把煤在矿上筛过。
5.
Grinding low grades of graphite to remove impurities, pencil makers elsewhere found difficulties.
对于各地的铅笔制造者来说，碾磨碎低品质的石墨以去掉里面的杂质，是十分困难的。
6.
clear from impurities, blemishes, pollution, etc..
去除杂质污渍污染等。
7.
To get rid of impurities,blemishes,muddiness,or foreign matter.
去除杂质、污渍、污泥或其它杂物
8.
cotton made absorbent by removal of the natural wax.
去掉天然蜡后的棉花做成的吸收物质。
9.
Once the impurities have been removed, the actual reduction to the metal is an easy step.
杂质一被除掉，金属的真正还原就容易了。
10.
Pig iron is converted into steel by removing most but not all the impurities
生铁变成钢要除掉大部分而不是全部的杂质。
11.
Through degrease disposing, 98% of greasy impurity and 95% of iron impurity attached on the surface of steel strip can be removed.
带钢经脱脂处理其表面油杂质去除率达98%、铁杂质去除率达95%。
12.
To remove salts and other chemicals from(sea water or soil, for example).
除去盐分从（海水或土壤等物质中）去掉盐份和其他化学物质
13.
Dressing may also remove particular substances containing undesirable elements, which may be difficult or impossible to remove later.
选矿还可以去掉含有无用元素的特殊物质，而这些物质以后再除掉可能很难，或者不可能除去。
14.
Pouring something acidic on the wound will help take the sting out.
在伤处喷洒一些酸性物质将有助于去掉蛰痛。
15.
To rid of impurities, blemishes, muddiness, or foreign matter.
使完美去除杂质、污渍、污泥或外来事物
16.
the act of removing solid particles from a liquid.
把杂质从液体中过滤出去。
17.
the process of removing impurities from oil or metals or sugar.
去除油类、金属、糖中杂质的过程。
18.
Skim the boiling rice from time to time.
随时把粥上面的杂质撇去。