Purification of FGD gypsum product

Patent · Tue Jun 01 00:00:00 EDT 1993

OSTI ID:6427538

Rogers, K J; Owens, II, F C

A method of purifying a gypsum slurry resulting from an upstream flue gas desulfurization process is described comprising the steps of: (a) delivering the gypsum slurry to a primary dewatering device; (b) separating this gypsum slurry in said primary dewatering device into a coarse solids stream and a fine solids stream, said coarse solids stream primarily containing coarse particle sizes therein and said fine solids stream primarily containing fine particle sizes therein; (c) selectively returning all or a portion of said fine solids stream back to the upstream flue gas desulfurization process or delivering all or a portion of said fine solids stream to downstream separation means for further separation into a thickened fines stream and a process water stream, said process water stream thereafter being selectively delivered, as desired, to the upstream flue gas desulfurization process; (d) delivering said coarse solids stream to a surge/mix tank where it is selectively mixed with a portion of said thickened fines stream prior to being delivered to a secondary dewatering device; and, (e) collecting a purified gypsum product from said secondary dewatering device.

• Assignee: Babcock and Wilcox Co., New Orleans, LA (United States)
• Patent Number(s): US 5215672; A
• Application Number: PPN: US 7-937775
• OSTI ID: 6427538
• Resource Relation: Patent File Date: 1 Sep 1992
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
GYPSUM
PURIFICATION
WASTE PROCESSING PLANTS
BY-PRODUCTS
ADSORBENTS
DESULFURIZATION
DEWATERING EQUIPMENT
FLUE GAS
PARTICLE SIZE
RECYCLING
SEPARATION PROCESSES
SLURRIES
CHEMICAL REACTIONS
CONCENTRATORS
DISPERSIONS
GASEOUS WASTES
INDUSTRIAL PLANTS
MINERALS
MIXTURES
SIZE
SULFATE MINERALS
SUSPENSIONS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management