Established in 1997 HEACHANG TECHNOLOGY CO LTD a comprehensive company specialized in the development production and purchase of various kinds of non ferrous metals which is copper residue that copper ash zinc slag copper scrap copper sludge copper concentrate and zinc residue that zinc ash zinc slag zinc scrap and nickel residue that nickel sludge nickel ash and nickel concentrate .Currently the high quality of our products is widely acknowledged by our customers.Our business includes export import and local distribution of used products and waste products.