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The recommended building materials industry standard JC/T 2950—2026, "Technical Specification for Application of Steel Slag Desulfurization By-Product Gypsum in Cement Production," drafted under the leadership of Ningbo Taiji Environmental Protection Equipment Co., Ltd., has been officially approved and published, and will come into effect on November 1, 2026.

This is the first industry standard in China specifically addressing the application of steel slag desulfurization by-product gypsum in cement production, marking a new stage in which this cross-industry solid waste recycling technology has evolved from engineering practice toward standardized and regulated development.

Standard Approval: Filling a Gap in the Field

List of 690 industry standards approved by MIIT, including JC/T 2950-2026 ▲

Prior to this, there was a lack of nationally unified technical specifications and quality evaluation standards for the application of steel slag desulfurization by-product gypsum in cement production, leading to uneven industry practices. The introduction of this standard fills this gap, providing clear execution criteria for material testing, process control, and quality acceptance.

Technical Background: From "Treating Waste with Waste" to Cross-Industry Recycling

Steel slag is an inevitable by-product of steelmaking — approximately 0.10 to 0.15 tonnes of steel slag are generated per tonne of crude steel produced, with a national annual output of approximately 120 to 140 million tonnes. In the past, about half was used as a cement additive, consuming nearly 50 million tonnes annually. Following the implementation of new cement national standards, this channel has narrowed significantly, forcing large volumes of steel slag into stockpiling. Currently, the cumulative stockpile of steel slag nationwide exceeds 1.5 billion tonnes, with approximately 70 million tonnes newly added each year, and the comprehensive utilization rate still lags significantly behind the policy target of 60%.

Given the large volume and limited outlets for steel slag, the question arises: can new consumption pathways be found? Taiji Environmental Protection's steel slag desulfurization technology provides the answer. Conventional flue gas desulfurization uses limestone as a sorbent, consuming mineral resources and generating carbon dioxide during lime production. Taiji Environmental Protection replaces limestone with steel slag — a bulk solid waste from the steel industry — achieving efficient desulfurization through the DS Multiphase Reactor. The alkaline components in steel slag react with sulfur dioxide in flue gas, and the by-product, primarily calcium sulfate dihydrate (i.e., FGD gypsum), can replace natural gypsum as a cement setting regulator.

This forms a complete cross-industry circular economy chain:

Steel industry steel slag → flue gas desulfurization sorbent → desulfurization by-product gypsum → cement setting regulator

On one hand, this alleviates the environmental pressure of solid waste stockpiling in the steel industry; on the other, it reduces the cement industry's extraction and consumption of natural gypsum mineral resources, truly achieving "treating waste with waste to enable resource reuse and turning waste into treasure."

This technology was included in the 2025 Catalogue of Advanced and Applicable Technologies and Equipment for Comprehensive Utilization of National Industrial Resources.

Industrial Value: Empowering the Dual Carbon Strategy

As one of the supporting standards for the green transformation of the cement industry, this standard, by regulating the application of solid waste recycling, can effectively reduce resource consumption and carbon emissions in cement production, promoting coordinated carbon reduction across the steel and building materials industries. It represents a concrete practice of the circular economy and Dual Carbon goals in the industrial sector. From national standards to metallurgical industry standards, and now to building materials industry standards, Taiji Environmental Protection has built a comprehensive standards system covering the entire chain from "steel slag raw material → desulfurization process → by-product application," using standards to guide the regulated development of the industry. Leading the development of this industry standard is a strong recognition of Taiji Environmental Protection's technical strength and industry commitment, and a significant milestone in the company's evolution from a "technology innovator" to an "industry standard leader."