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Science and Technology Daily recently published a feature report on the technological innovation and pilot application of Chairman Shi Hanxiang and his team at Taiji Environmental Protection, under the title "New Technology Converts Waste into Resource: Steel Slag Desulfurization By-products Serve as a Remedy for Saline-alkali Land."

The international academic journal Microchemical Journal recently published a paper titled "Research on Steel Slag Desulfurization and Comprehensive Treatment of Saline-Alkali Land Based on the Circular Economy Concept." The paper proposes an ecological restoration model of "solid waste utilization — waste gas treatment — by-product reclamation of desert land," exploring a new path for China's steel slag valorization and ecological treatment. This circular economy chain has so far been piloted at the Baogang Qinghua desulfurization project in Inner Mongolia and in a systematic comprehensive saline-alkali land treatment project.

Monitoring data shows that, through the application and operation of the desulfurization technology and project, the enterprise can reduce sulfur dioxide emissions by approximately 7,000 tons, consume about 17,000 tons of steel slag powder, and save 16,000 tons of limestone annually. To date, more than 200 enterprises in over 10 provinces, spanning hazardous waste, steel, non-ferrous metals, chemicals, and various industrial furnaces, have adopted this technology, which offers both environmental value and economic potential.

Shi Hanxiang, Chairman of Ningbo Taiji Environmental Protection Equipment Co., Ltd. and Chief Expert of Zhejiang Hanxiang Research Institute Co., Ltd., the first author of the paper, led the team to complete the technological innovation and pilot application. As a national-level SRDI "Little Giant" enterprise, Ningbo Taiji Environmental Protection Equipment Co., Ltd. has developed the DS Multiphase Reactor with a desulfurization efficiency of 99.9%. Since 2015, Shi Hanxiang has led the team, through technological innovation, to process the spent steel slag and fly ash that absorbed sulfur dioxide after desulfurization into a soil amendment, used to reclaim deserts and saline-alkali land. Scientific testing and field trials show that this amendment provides high fertilizing effect.

Using the Baogang Qinghua desulfurization project in Inner Mongolia as a case, the paper describes the project's process flow, implementation plan, treatment outcomes, and risk assessment, and quantitatively evaluates its economic and environmental benefits. The analysis shows that a 1:1 replacement of limestone in the flue gas desulfurization absorbent would consume about 150 million tons of steel slag annually; the resulting desulfurization by-products could also be used to amend saline-alkali sandy wasteland, offering a new method for saline-alkali land treatment and a sustainable route for the large annual volume of new steel slag solid waste. While saving energy, reducing emissions, and restoring the environment, this innovative model is expected to add new available land resources.

"After years of practice and exploration, we must follow the green, low-carbon circular economy path to resolve the contradiction between economic development and environmental protection, restore natural ecological balance, and safeguard the long-term interests of future generations," said Shi Hanxiang. Taiji Environmental Protection will continue to improve the utilization efficiency and valorization level of waste through ongoing exploration and technological innovation, reduce environmental pollution and damage, advance the development of a green circular economy system, and safeguard food security.

Microchemical Journal, which publishes comprehensive research in chemistry and analytical chemistry, is indexed in the SCIE database and enjoys strong academic influence.

Source: Science and Technology Daily