Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1991-10-29
1996-03-19
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423170, 423555, 106786, 209729, B04C 526, C01B 1722, C01F 1146, C01F 512
Patent
active
055001971
ABSTRACT:
The process for purifying gypsum suspensions, particularly those formed in a flue gas desulfurizing plant, includes feeding the gypsum suspension (9) to a first hydrocyclone (1), which is operated to produce an underflow (11) with a comparatively high underflow concentration and an overflow fed to a collecting tank (2). The underflow (11) of the first hydrocyclone stage is further diluted to a form another underflow with a lower solids content in a suspension tank (3) and then is fed to a second hydrocyclone stage (4), the overflow of which is also fed to the collecting tank (2). Depending on purity of the gypsum required or attained, the gypsum contained in an underflow (14) of the second hydrocyclone stage (4) is either immediately dewatered and removed or is first fed to one or more hydrocyclone stages, which operate analogously. The combined overflows (15) of the first and second or further hydrocyclone stages are fed from the collecting tank (2) to a third hydrocyclone stage (6). In a thickener (8) solid particles are removed from the overflow (17) of the third hydrocyclone (6) and the clear effluent (23), which is an overflow from the thickener (8), is used for diluting in the suspension tank (3).
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Krebs Cyclowash, Krebs Engineers, 1705 Chrysler Drive Menlo Park CA Mar. 79.
Metallgesellschaft Aktiengesellschaft
Straub Gary P.
Striker Michael J.
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