Resource recovery and drying solution for power plant desulfurization gypsum

Desulfurization gypsum from power plants is an industrial by-product of flue-gas desulfurization. Characterized by high moisture content and a tendency to clump, it easily reabsorbs moisture and hardens when stockpiled. Long-term open-air storage not only occupies valuable space and generates dust but also poses environmental compliance risks. Utilizing a specialized desulfurization gypsum rotary drying process for standardized dehydration transforms this waste into high-quality raw material for construction products, thereby reducing solid waste and turning waste into a valuable resource.

Key Challenges in Desulfurization Gypsum Drying

Raw desulfurization gypsum has high moisture content and high viscosity; standard drying equipment often suffers from issues such as material sticking to walls, clogging, uneven drying, and excessive dust generation. Furthermore, gypsum is temperature-sensitive; improper temperature control can trigger phase changes that compromise material properties, resulting in finished products that fail to meet strength and stability standards—rendering them unsuitable for applications like construction materials or cement retarders.

Advantages of the Rotary Drying Process

Tailored to the material properties of power plant desulfurization gypsum, a specialized rotary dryer offers the optimal solution for large-scale resource recovery and continuous plant operations:

1. Uniform material agitation and stable heat exposure allow for precise removal of free moisture; the output moisture content is controllable and consistent, eliminating issues with uneven drying or moisture re-absorption.

2. Controlled low-temperature drying prevents phase-change degradation caused by high heat, fully preserving the material's original properties and ensuring product quality.

3. The entire system operates in a sealed environment equipped with a dust removal system, effectively suppressing dust emissions and meeting power plant environmental standards.

Simplified Resource Recovery Process

Wet desulfurization gypsum undergoes screening to remove impurities before being fed at a constant rate into the rotary dryer for temperature-controlled dehydration. Once dried to specifications, the material is cooled, screened, bagged, and stored. The process is streamlined and highly automated, requiring no complex pre-treatment, making it ideal for the high-volume, routine solid waste processing needs of power plants.

Value of Resource Recovery

The dried desulfurization gypsum can be directly utilized as a cement retarder, a raw material for architectural gypsum, or a filler for gypsum boards, offering a wide range of market applications. It not only resolves the challenges associated with solid waste stockpiling and environmental compliance at power plants—significantly reducing disposal costs—but also transforms industrial waste into high-value products for sale, thereby achieving a dual boost in environmental and economic benefits.