Your Choice of Product
Choosing the right raw material is one of the first — and most consequential — decisions when planning a gypsum board plant. Natural gypsum is the traditional choice, while FGD gypsum (flue gas desulfurization gypsum) offers a lower-cost alternative sourced from coal power plants. The right answer depends on your feedstock availability, product quality targets, and equipment budget. DCI configures production lines for both, plus phosphogypsum, across 20+ countries.
Material | Source | Typical Purity |
Natural gypsum | Quarried gypsum rock | CaSO₄·2H₂O above 80% |
FGD gypsum | Coal power plant scrubber byproduct | CaSO₄·2H₂O 85–95% |
Phosphogypsum | Fertilizer industry byproduct | Variable, requires treatment |
Natural gypsum is mined and crushed. FGD gypsum is a synthetic byproduct captured from power plant emissions — a fine, wet powder that must be dried before calcination.
The main differences between natural gypsum and FGD gypsum are moisture content, whiteness, and impurity profile.
Attribute | Natural Gypsum | FGD Gypsum |
Free moisture | Low | 8–12%, requires drying |
Whiteness | Generally higher | Lower, may need treatment |
Impurities | Clay, sand, organics | Unreacted limestone, ash |
Consistency | Varies by deposit | More uniform |
FGD gypsum is often more chemically uniform than natural gypsum, but its high moisture and fine particle size require additional processing before it can be used.
This is where the cost difference appears. FGD gypsum processing requires additional front-end equipment that natural gypsum does not.
Processing Step | Natural Gypsum | FGD Gypsum |
Crushing | Required | Not required (already fine) |
Drying | Not required | Required (8–12% moisture) |
Impurity screening | Minimal | Required |
Calcination | Standard | Standard |
The added drying and screening stages increase FGD gypsum equipment cost by roughly 10–20% compared to a natural gypsum line.
Cost Factor | Natural Gypsum | FGD Gypsum |
Raw material cost | Higher (mining + transport) | Lower (byproduct, often local) |
Equipment cost | Baseline | +10–20% |
Operating cost | Standard | Higher energy for drying |
The economics typically favor FGD gypsum when a coal power plant is nearby and the product whiteness requirement is moderate. Natural gypsum wins when visual quality is a priority and the deposit is accessible.
●Choose natural gypsum if you need high-whiteness board, have a local deposit, and want the simplest equipment configuration.
●Choose FGD gypsum if a coal plant is nearby, you want to lower raw material cost, and your market accepts standard whiteness.
●Choose phosphogypsum only where it is abundant and cheap, accepting higher treatment cost.
DCI configures each gypsum board production line to the client's specific feedstock. A natural gypsum line is the simplest; an FGD gypsum line adds a drying and screening module; a phosphogypsum line adds washing and neutralization. Real examples include a 20 million m²/year board line in Oman (natural gypsum) and a 15 million m²/year line in Morocco — demonstrating the range of raw material configurations DCI has delivered.
Tell us your available raw material, target capacity, and fuel type. We'll recommend the right configuration and provide a tailored quotation.
Hengshui Decheng Machinery & Equipment Co., Ltd. (DCI) | Email: dci@chinagypsummachine.com | WhatsApp: +86 13930110827 /+86 18203235588 | www.dcimachine.com
Processing Demand Survey
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