Flue gas desulphurisation gypsum (FGD)
Flue Gas Desulphurisation (FGD) gypsum is a type of synthetic gypsum that can be used to supplement the supply of natural gypsum, it can be 96% pure which is higher than most natural gypsums at 80%, so can be used in gypsum blends.
It is a by-product of a wet purification procedure with natural lime, formed in scrubbing towers of power plants. It forms in the same process as natural gypsum only one that is extremely accelerated down to a few hours. The SO2 is washed out by water, oxidised to sulphates SO3 in an aqueous solution, calcium from quicklime precipitates into a purer form (than natural) of gypsum, dihydrous calcium sulphate (CaSO4,2H2O).
It is the most common process to create synthetic gypsum and an important supplement to natural gypsum, although it is a by product is is also reliant on the firing of coal powered energy centres. Other synthetic gypsums are phosphogypsum, titanogypsum, citrogypsum, fluoroanhydrite, as well as other processes.
[edit] Related articles on Designing Buildings
Featured articles and news
Investors in People: CIOB achieves gold
Reflecting a commitment to employees and members.
Scratching beneath the surface; a guide to selection.
ECA 2024 Apprentice of the Year Award
Entries open for submission until May 31.
UK gov apprenticeship funding from April 2024
Brief summary the policy paper updated in March.
For the World Autism Awareness Month of April.
70+ experts appointed to public sector fire safety framework
The Fire Safety (FS2) Framework from LHC Procurement.
Project and programme management codes of practice
CIOB publications for built environment professionals.
The ECA Industry Awards 2024 now open !
Recognising the best in the electrotechnical industry.
Sustainable development concepts decade by decade.
The regenerative structural engineer
A call for design that will repair the natural world.
Buildings that mimic the restorative aspects found in nature.
CIAT publishes Principal Designer Competency Framework
For those considering applying for registration as a PD.
BSRIA Building Reg's guidance: The second staircase
An overview focusing on aspects which most affect the building services industry.
Design codes and pattern books
Harmonious proportions and golden sections.
Introducing or next Guest Editor Arun Baybars
Practising architect and design panel review member.
Quick summary by size, shape, test, material, use or bonding..