Method of removing sulphur dioxide from a gaseous stream

Details Method of removing sulphur dioxide from a gaseous stream Method of removing sulphur dioxide from a gaseous stream

1988-02-26

1989-09-19

Doll, John

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423497, 423554, 423242, C01B 1798

Patent

active

048679615

ABSTRACT:
Capture-fixation of SO.sub.2 from flue and non-ferrous smelter gases is achieved with the use of MgO aqueous slurry as an absorbing medium. During the absorption, most of the MgO is converted to MgSO.sub.4 and the rest is solubilized as MgSO.sub.3 and Mg(HSO.sub.3).sub.2. The clear solution obtained at the end of the absorption is brought to about 40.degree. C. and is treated with sulphuric acid in an amount representing at least 5% in excess of the stoichiometric requirement whereby sulphite and bisulphite of magnesium are converted to magnesium sulphate. The magnesium sulphate obtained above can be used in a two stage addition of potassium chloride to obtain magnesium chloride, and calcined dolomite added to the remainder whereby magnesium hydroxide is precipitated and may be filtered off from the resulting CaCl.sub.2 solution. The process provides a means of removing SO.sub.2 from flue and smelter gases and at the same time produces industrially important chemical products (SO.sub.2, H.sub.2 SO.sub.4, K.sub.2 SO.sub.4, MgO, CaCl.sub.2).

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CRC, "Handbook of Chemistry and Physics", 43 Edition, Hogman Editor, Chemical Rubber Publishing Co., Cleveland Ohio, p. 1726.
John C. Mathews et al., SO.sub.2 Control Processes for Non-Ferrous Smelters, Research Triangle Institute, NTIS Report PB 251 409, 1976.

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