Process for producing barium hydroxide
AssigneeMetallgesellschaft Aktiengesellschaft
InventorHans-Joachim Rohrborn
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Abstract
Barium hydroxide is continuously produced from barite by: 1. reducing barite with carbon at elevated temperatures and hot-leaching the reaction mixture to extract raw barium sulfide; 2. partially oxidizing the barium sulfide from step (1) by treatment with oxygen-containing gases and precipitating the resulting barium hydroxide in crystalline form and removing same; 3. oxidizing the barium polysulfide contained in the mother liquor from step (2) to difficultly soluble barium thiosulfate by treatment with oxygen-containing gases and removing same; and 4. recycling the barium thiosulfate from step (3) to reduction step (1).
Claims4
Process for continuously producing barium hydroxide from barite wherein sulfur is essentially the only bi-product, comprising the steps of:
- a. reducing barite with carbon at temperatures of 800.degree. to 1300.degree. C and hot-leaching the reaction mixture of molten raw barium sulfide;
- b. partially oxidizing the leaching product from the raw barium sulfide by treatment with oxygen-containing gases until a ratio of 50 mol percent barium hydroxide to 50 mol percent barium polysulfide is reached and precipitating the resulting barium hydroxide in crystalline form by cooling and removing same;
- c. oxidizing the barium polysulfide contained in the mother liquor from (b) to difficulty soluble barium thiosulfate by treatment with oxygen-containing gases and removing the precipitated barium thiosulfate;
- and
- d. recycling the precipitated barium thiosulfate from (c) to reduction step (a).
Dependencies are inferred from the claim text.