However, the pyrite cinder, a resource that can be reused, contains 20 percent to 60 percent iron and small amount of valuable elements, such as copper, zinc, and trace gold and silver.

而烧渣中一般含铁20% ~ 60%，以及少量铜、锌和微量金银等有价值元素，是一种二次资源。

youdao

However, the pyrite cinder, a resource that can be reused, contains 20 percent to 60 percent iron and small amount of valuable elements, such as copper, zinc, and trace gold and silver.

而烧渣中一般含铁20% ~ 60%，以及少量铜、锌和微量金银等有价值元素，是一种二次资源。

youdao