Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group va metal or arsenic
Patent
1982-03-26
1984-03-20
Meros, Edward J.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group va metal or arsenic
423617, C01B 2700, C01B 2900
Patent
active
044380798
ABSTRACT:
Arsenic anhydride of high purity is inexpensively manufactured from an arsenic sulfide-containing substance by first contacting the arsenic sulfide-containing substance with a copper sulfate-containing aqueous solution so as to provide an extract solution containing arsenious acid, the extract solution is subjected to aeration in the presence of copper ions such that the arsenious acid therein is mostly oxidized to arsenic acid, the thus provided treated solution is subjected to a weak reducing agent to cause crystals of arsenious anhydride to form, and these crystals are then recovered. Alternatively, the extract solution is cooled to recover a solid precipitate containing arsenious anhydride, these solids are repulped into a slurry, the slurry subjected to aeration in the presence of copper ions such that the arsenious acid therein is mostly oxidized to arsenic acid, the thus provided treated solution is subjected to a weak reducing agent to cause crystals of arsenious anhydride to form, and these crystals are then recovered.
REFERENCES:
patent: 1921706 (1933-08-01), Schopper
patent: 1952290 (1934-03-01), Schopper
patent: 4096232 (1978-06-01), Vogt
patent: 4102976 (1978-07-01), Hiemeleers et al.
patent: 4218425 (1980-08-01), Charlton et al.
Kubo Naoki
Nakano Tadashi
Tamura Hiroyuki
Langel Wayne A.
Meros Edward J.
Sumitomo Metal Mining Company Limited
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