Process for separating arsenic acid from an aqueous mixture comp

Details Process for separating arsenic acid from an aqueous mixture comp Process for separating arsenic acid from an aqueous mixture comp

1994-08-26

1995-09-12

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group va metal or arsenic

423 88, 423617, 423531, 423489, C01G 2800, C22B 3000, C01B 1790, C01B 908

Patent

active

054495032

ABSTRACT:
The present invention provides a process for recovering arsenic acid from a starting mixture comprising sulfuric and arsenic acids and water. In step (a), the starting mixture is treated with a sulfur (IV) compound which will reduce the arsenic acid to arsenic (III) compound under conditions sufficient to substantially convert the arsenic acid to arsenic (III) wherein the resulting mixture comprises arsenic (III) compound, the sulfur (IV) compound, sulfuric acid, and water. In step (b), the resulting mixture is purged with gas to substantially remove the sulfur (IV) compound from the mixture wherein the purged mixture comprises the arsenic (III) compounds, sulfuric acid, and water. In step (c), the purged mixture is treated under conditions sufficient to substantially separate the arsenic (III) compounds from the purged mixture. In step (d), the separated arsenic (III) compound is reacted with an oxidizing agent to substantially convert arsenic (III) compound to arsenic acid wherein the final mixture comprises arsenic acid, unreacted oxidizing agent, and water. In step (e), impurities are removed from the final mixture to provide substantially pure aqueous arsenic acid.

REFERENCES:
patent: 1952290 (1934-03-01), Schopper
patent: 4220627 (1980-09-01), Fugleberg et la.
patent: 4769230 (1988-09-01), Greco et al.
patent: 4891207 (1990-01-01), Broome
patent: 5089241 (1992-02-01), Smith et al.
R. D. Gigauri et al., "Method for obtaining Arsenic Acid Anhydride", Soobsnch, Akad. Nauk Gruz. SSR 124(2), 309 (1986), Chem. Abs. 106(12) 94953v.
L. Nan et al., "Kinetics of Reduction of Arsenic(V) to Arsenic(III) with Sulfur Dioxide in Aqueous Solution", Australas. Inst. Min. Metall. Publ. Ser. 1989, Jun. 1989, Non-ferrous Smelting Symp., 145 (1989).
K. Gritton et al., "Metal Recovery from Metallurgical Wastes", Society for Mining, Metallurgy and Exploration, Inc., Feb. 26-Mar. 1, 1990.

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