Fertilizer processes incorporating scrubbed flue gas sludge bypr

Details Fertilizer processes incorporating scrubbed flue gas sludge bypr Fertilizer processes incorporating scrubbed flue gas sludge bypr

1976-02-23

1977-02-01

Chemistry: fertilizers

Processes and products

Organic material-containing

71 34, 71 43, 423310, C05F 700

Patent

active

T09550020

ABSTRACT:
A process for the production of a granular fertilizer material from sludge materials discharged from scrubbing processes that remove pollutants from boiler flue gases. Waste sludge discharged from flue gas scrubber systems often contain large amounts of calcium and sulfur as well as lesser amounts of other compounds known to have plant nutrient value. The sludge is treated with an acid such as phosphoric, sulfuric or nitric, or a mixture of these, and ammonia. The resulting sludge-ammonia-acid salt mixture is combined with partially dried, previously processed solid material (recycle) in a horizontal rotating vessel. Additional ammonia and/or acid is added to the rotating vessel to cause the sludge-salt mixture to solidify and granulate. Other plant nutrients may be added to the rotating vessel during granulation. The granulated material discharged from the rotary vessel is further processed (dried, cooled, and screened) to obtain desirable moisture content and particle size.

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