u2022tThe following are the types of the materials that we can purchase.u00a7Copper Residue/ sludge/ ash/dross/slagu00a7Nickel Residue/ sludge/ ash/dross/slagu00a7Cobalt Residue/ sludge/ ash/dross/catalystu00a7Tin Residue/ sludge/ ash/dross/slagu00a7Zinc Residue/ sludge/dross/slagu00a7Molybdenum Residue /Catalystu00a7Precious Metal Residue/Concentrate/sludge( Silver, Indium, Gold, Platinum, )u00a7Brass residueu00a7Lead residue Show More