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Industrial by-product gypsum refers to by-products and residues generated through chemical reactions in industrial production processes. It is mainly composed of calcium sulfate, and is also known as chemical gypsum or industrial waste gypsum. Its resource utilization is no longer limited to traditional consumption as building materials. A multi-level, cascade high-value industrial chain for comprehensive utilization has gradually taken shape, steadily moving toward the goals of full-volume resource recovery and circular economy development.
Amid the green transformation of solid waste recycling, Zenith addresses actual industry demands by providing customized complete grinding system solutions. With professional equipment and integrated services, we continuously support the in-depth resource utilization of industrial by-product gypsum and the transformation and upgrading of related industries.
Industrial By-product Gypsum Treatment Process
Taking FGD (flue gas desulfurization) gypsum as a typical mainstream variety, the mature and stable mainstream technology widely adopted in the industry is the two-step process. This process separates pre-drying and calcination into two independent stages, solving various problems caused by direct calcination of high-moisture raw materials.
Pre-drying
High-moisture FGD gypsum raw material undergoes rapid pre-drying in drying equipment. The main purpose is to remove most free water, preventing scaling and blockage in subsequent calcination equipment and ensuring smooth follow-up processes.
Calcination
The pre-dried material is sent to a calciner for further deep dehydration. During this process, dihydrate gypsum loses part of its crystal water and transforms into hydraulic hemihydrate gypsum, namely plaster of Paris.
Grinding and Modification
The original FGD gypsum has poor particle size distribution. Therefore, the calcined plaster must be milled (with a typical finished particle size of 5–60 μm) to optimize particle structure, stabilize product performance, and guarantee the strength and quality of downstream gypsum products.
Cooling and Aging
The grinding gypsum powder is cooled and homogenized through aging to stabilize its temperature and phase composition, before being conveyed to finished product silos for storage and later use.
Grinding Solution for Industrial By-product Gypsum
In response to the unique material characteristics of industrial by-product gypsum, Zenith has carried out special optimization and upgrading of the grinding process and classification technology.
This solution ensures efficient and stable operation of the entire production line, while precisely controlling the particle size distribution and optimizing the gradation of finished gypsum powder, laying a solid foundation for the quality of subsequent gypsum products.
In addition to high-performance main grinding equipment, Zenith also provides one-stop full-process supporting solutions to fully support project implementation and long-term stable production and operation.
LM Vertical Roller Mill
LM Vertical Roller Mill integrates crushing, grinding, drying and powder classification into one unit, featuring high operational efficiency and low energy consumption.
In addition, it is innovatively equipped with a five-level safety explosion-proof system, combined with online monitoring and automatic fire suppression systems to achieve full-process safety control. It eliminates dust pollution and potential safety hazards at the source, perfectly resolving the core pain points of traditional processes.
MTW European Trapezium Grinding Mill
MTW European Trapezium Grinding Mill adopts multiple innovative grinding technologies, with comprehensive upgrades to modules including the transmission system, lubrication system, air duct, roller and ring structure, particle size regulation, powder classification system, air inlet volute, and intelligent control system. It enables efficient, stable, energy-saving and intelligent operation of powder production.
