发明名称 |
FREMGANGSMAATE TIL BEHANDLING AV AVFALLSVANN SOM INNEHOLDER SVOVELSYRE |
摘要 |
<p>1524233 Recovering sulphur values from aqueous effluents INSTITUT FRANCAIS DU PETROLE 11 Aug 1975 [14 Aug 1974 6 March 1975] 33396/75 Headings C1A and C1C Sulphur values are recovered from an aqueous effluent containing sulphuric acid and, optionally, heavy metal ions by: (a) reacting the effluent with an aqueous solution containing ammonium sulphite and/or ammonium bisulphite, separating from the solution the sulphur dioxide formed and, then optionally, treating the solution with hydrogen sulphide and/or ammonia to precipitate a sulphide and/or a hydroxide of the heavy metal which is separated; (b) reacting calcium oxide with the solution contained in step (a) to precipitate the sulphate ions thereof in the form of calcium sulphate and to form an aqueous ammoniacontaining solution; (c) vaporizing ammonia from the aqueous solution formed in step (b); (d) reducing the calcium sulphate formed in step (b) with carbon or hydrocarbon so as to form calcium oxide and a sulphur dioxide-containing gas; (e) contacting the ammonia from step (c) with the sulphur-containing gas from step (d) and with water, to form an aqueous solution containing ammonium sulphite and/or ammonium bisulphite; (f) recycling to step (a) at least a portion of the aqueous solution formed in step (e); and (g) recycling to step (b) at least a portion of the calcium oxide formed in step (d). The sulphur dioxide obtained in the process may be converted to sulphur trioxide or elemental sulphur.</p> |
申请公布号 |
NO139382(B) |
申请公布日期 |
1978.11.20 |
申请号 |
NO19750002818 |
申请日期 |
1975.08.13 |
申请人 |
INSTITUT FRANCAIS DU PETROLE, |
发明人 |
ALAGY, JACQUES,;BUSSON, CHRISTIAN,;CESSOU, MAURICE, |
分类号 |
C02F1/58;C01B17/05;C01B17/58;(IPC1-7):01B17/50;02C5/02 |
主分类号 |
C02F1/58 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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