Removal of Arsenic from Solutions.
Flynn-CM Jr.; Carnahan-TG
U S Appl 416 191 1983 Mar; :8 pages
Arsenic is removed from an aqueous acid process or waste solution by adding a soluble titanium compound to precipitate ti(haso4)2 at ph less than or equal to 2. Thus, a 180 mg/l as5+ solution acidified with h2so4 was treated with ti4+ or fe3+ compounds at room temperature; precipitates were formed within 1 h and were allowed to settle overnight. The solution then was decanted and analyzed. The reagent/as mole ratios were ti4+/as5+ = 0.8 and fe3+/as5+ = 1.75. Ti4+ was much more effective than fe3+ for precipitating as5+ at ph less than or equal to 2. Similar results were obtained in chloride solutions.
U.S. Appl. 416,191, Mar. 18, 1983, 8 PP., Chem. Abstr. 98:183,262C