Alunite is a harmfulimpurity which is difficult to remove from kaolinite and so is kaolinite in alunite ore.
明矾石是高岭土中难以除去的有害杂质，高岭石也是明矾石矿石中的有害杂质。
2
Alunite is a harmfulimpurity which is difficult to remove from kaolinite, and so is kaolinite in alunite ore.
明矾石是高岭土中难以除去的有害杂质，高岭石也是明矾石矿石中的有害杂质。
3
The paper relates the pollution and harm from the drained off waste acid from wire drawing and cooling water with harmfulimpurity in steel wire production.