| abstract |
PURPOSE: To remove As effectively and simply in the form of iron arsenate from an acidic solution contg. As and heavy metals such as Cu by adding an oxidizing agent and ferrous salt to the solution and oxidizing the ferrous salt while controlling the pH using air or the like. n CONSTITUTION: An oxidizing agent such as H 2 O 2 is added to an acidic solution contg. As and heavy metals such as Cu, Cd, Zn, etc. produced after separating Pb from the flue cinder generated in a refining stage of Cu using H 2 SO 4 to transform As 3+ to As 5+ which is more easily precipitated. A ferrous salt contg. ≤ca. 10pts.wt. Fe per 1pt.wt. As is then added to the solution and Fe 2+ is transformed to Fe 3+ by oxidizing with air, O 2 , an oxidizing agent, or a combination thereof while adjusting the pH of the solution to 1.5W3.0, pref. 2.0W2.6 to precipitate As in the form of iron arsenate. By this process, As is effectively separated from an acidic solution contg. heavy metals such as Cu in the form of iron arsenate contg. ≥ca. 10% As. n COPYRIGHT: (C)1984,JPO&Japio |