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AssigneeMarsulex Environmental Technologies Corporation
InventorsRaymond R. Gansley, Michael T. Hammer, Michael L. Mengel
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A process and system for producing fertilizers with reduced levels of contaminants, and particularly a flue gas scrubbing process and facility that produce a fertilizer byproduct which is treated to remove heavy metals originally present in the scrubbed flue gas. The process entails contacting a flue gas with a scrubbing solution to remove acidic gases and produce a byproduct containing a fertilizer compound precipitate and dissolved metals and/or metal compounds. A fertilizer solution containing dissolved fertilizer and dissolved metals and/or metal compounds is then produced by adding water to the byproduct, after which the pH of the fertilizer solution is adjusted one or more times with a gaseous and/or liquid alkali to form precipitates of one or more metal species. The precipitates are then removed from the fertilizer solution and the solution dewatered to yield a fertilizer product with lower contaminant levels.
A flue gas scrubbing process in which a flue gas containing acidic gases and metals and/or metal compounds is contacted with an ammonium sulfate solution to absorb sulfur dioxide and produce a byproduct containing ammonium sulfate precipitate and dissolved metals and/or metal compounds, the method comprising the steps of:
A flue gas scrubbing facility that produces as a byproduct a fertilizer with reduced levels of contaminants, the flue gas scrubbing facility comprising:
A flue gas scrubbing facility that uses an ammonium sulfate solution to absorb sulfur dioxide from a flue gas that contains metals and/or metal compounds, and which produces a byproduct containing ammonium sulfate precipitate and dissolved metals and/or metal compounds, the flue gas scrubbing facility comprising:
Dependencies are inferred from the claim text.