Research has been conducted at the Faculty of Metallurgy, Technical Univers
ity, Kosice, to develop a hydrometallurgical method for removing arsenic fr
om copper converter dust. The process consists of a selective leaching of t
he flue dust in which arsenic is dissolved in sodium-sulfide solution and t
hen removed by precipitation methods using various agents: copper sulfate,
a mixture of phosphoric acid with calcium hydroxide, calcium oxide, and fer
rous or ferric sulfate. In principle, arsenic can be removed as a marketabl
e product (copper arsenate for wood preservation) or as stable precipitate
compounds suitable for safe landfill disposal under existing U.S. Environme
ntal Protection Agency regulations.