Mill scale, steel slag, iron slag wanted

We are a leading importer of mill scale in Chinese market. Our annual quantity is around 300,000MT. The detail requirement is as follows:

Product Name: Mill Scale

Specifications as follows:

Fe content  70.00% PCT Basis   Below 68.00 PCT Rejection

SIO2+CAO  02.50 PCT  Max.   Over 03.00 PCT Rejection