- Extraction of precious metals from secondary raw materialReconfirm the price with sellerOrder a serviceAdd to selectedSellerANHUI Province ZHENGDA Environment Engineering CompanyChina, Hefei(View map) +86( Display phones Contact the seller - Extraction of precious metals from secondary raw materialFull namePhoneE-mailCaptcha (4 characters)I agree with privacy policies, regarding confidential data and user agreementMessage