What is drywall
Drywall is the principal wall material used in the United States for interior purposes. It is made of a sheet of gypsum covered on both sides
with a paper facing and a paperboard backing. Drywall is also referred to as gypsum board, wallboard.
Most new construction drywall is wasted during installation. If properly handled and contained tons of new drywall scrap may be generated
per year. The amount fluctuates with the construction industry and homes being built.
The drywall will be processed at our facility which will be ground up into gypsum.
Drywall is the principal wall material used in the United States for interior purposes. It is made of a sheet of gypsum covered on both sides
with a paper facing and a paperboard backing. Drywall is also referred to as gypsum board, wallboard.
Most new construction drywall is wasted during installation. If properly handled and contained tons of new drywall scrap may be generated
per year. The amount fluctuates with the construction industry and homes being built.
The drywall will be processed at our facility which will be ground up into gypsum.
GYPSUM (CaSO4)
Gypsum is a naturally occurring mineral that is made up of calcium sulfate and water (CaSO4+2H2O) that is sometimes called hydrous
calcium sulfate. It is the mineral calcium sulfate with two water molecules attached. By weight it is 79% calcium sulfate and 21% water.
Gypsum has 23% calcium and 18% sulfur and its solubility is 150 times that of limestone, hence it is a natural source of plant nutrients.
Gypsum naturally occurs in sedimentary deposits from ancient sea beds. Gypsum is mined and made into many products like drywall used in
construction, agriculture and industry. It is also a by-product of many industrial processes. Gypsum is also used as a generic name for many
types of sheet products made of a non-combustible core with a paper surfacing that adds strength. These include drywall, ceiling tiles,
partitions, etc. whose strength is directly related to its thickness and a few trace materials.
Gypsum is a naturally occurring mineral that is made up of calcium sulfate and water (CaSO4+2H2O) that is sometimes called hydrous
calcium sulfate. It is the mineral calcium sulfate with two water molecules attached. By weight it is 79% calcium sulfate and 21% water.
Gypsum has 23% calcium and 18% sulfur and its solubility is 150 times that of limestone, hence it is a natural source of plant nutrients.
Gypsum naturally occurs in sedimentary deposits from ancient sea beds. Gypsum is mined and made into many products like drywall used in
construction, agriculture and industry. It is also a by-product of many industrial processes. Gypsum is also used as a generic name for many
types of sheet products made of a non-combustible core with a paper surfacing that adds strength. These include drywall, ceiling tiles,
partitions, etc. whose strength is directly related to its thickness and a few trace materials.
Types and Sources of Gypsum
There are several types of naturally occurring gypsum, and many industrial processes also produce gypsum as a by-product of their systems
such as phosphoric acid and citric acid manufacture.
Mined Gypsum
Flue Gas Desulphurization (FGD) gypsum and Spray-Dry Absorption materials (SDA)
Phosphogypsum
Pickle Gypsum
Modern drywall contains very little contaminates and is well below the EPA standards for Biosolids usage when applied to soils.
There are several types of naturally occurring gypsum, and many industrial processes also produce gypsum as a by-product of their systems
such as phosphoric acid and citric acid manufacture.
Mined Gypsum
Flue Gas Desulphurization (FGD) gypsum and Spray-Dry Absorption materials (SDA)
Phosphogypsum
Pickle Gypsum
Modern drywall contains very little contaminates and is well below the EPA standards for Biosolids usage when applied to soils.
Green Building
Drywall should contain a 75% or greater recycled content. The primary environmental impacts of raw gypsum are habitat disruption from
mining, energy use, associated emissions in processing and shipment to solid waste from disposal. Using recycled gypsum reduces all of
these. New green building standards “Leadership in Energy and Environmental Design (LEED)” give certification credits for recycling drywall
gypsum from construction projects. The paper content of gypsum wallboard is 1% or less. Upon grinding with a hammer mill, recycled gypsum
is 93% gypsum powder and 7% shredded paper. Researchers also conclude that wallboard scrap is at least equivalent in effectiveness with
commercial gypsum fertilizer and did not negatively affect crop growth and yield. Land applications for disposal which have been at rates up to
22 tons/acre have been studied without negative effects. Often recycled drywall works better than mined gypsum since minor and trace
elements have been added as strengthening agents to the drywall board.
Drywall should contain a 75% or greater recycled content. The primary environmental impacts of raw gypsum are habitat disruption from
mining, energy use, associated emissions in processing and shipment to solid waste from disposal. Using recycled gypsum reduces all of
these. New green building standards “Leadership in Energy and Environmental Design (LEED)” give certification credits for recycling drywall
gypsum from construction projects. The paper content of gypsum wallboard is 1% or less. Upon grinding with a hammer mill, recycled gypsum
is 93% gypsum powder and 7% shredded paper. Researchers also conclude that wallboard scrap is at least equivalent in effectiveness with
commercial gypsum fertilizer and did not negatively affect crop growth and yield. Land applications for disposal which have been at rates up to
22 tons/acre have been studied without negative effects. Often recycled drywall works better than mined gypsum since minor and trace
elements have been added as strengthening agents to the drywall board.
www.constructionrecyclesolutions.com
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