The State Council issued a heavy document! Comprehensive upgrade of red mud, fly ash, tailings and phosphogypsum disposal!

2025, the State Council issued the Action Plan for Comprehensive Treatment of Solid Waste (hereinafter referred to as the Action Plan), requiring that by 2030, the special treatment of solid waste in key areas should achieve remarkable results, the historical stockpile of solid waste should be effectively controlled, the high incidence of illegal dumping and disposal should be curbed, and the disposal of solid waste should be effectively controlled. The annual comprehensive utilization of bulk solid waste will reach 4.5 billion tons, the annual recycling of major renewable resources will reach 510 million tons, and the comprehensive treatment capacity and level of solid waste will be significantly improved. The requirements of the

Action Plan for the disposal of solid wastes such as red mud, fly ash, tailings, straw, phosphogypsum and hazardous wastes have been upgraded in an all-round way.

The Action Plan proposes to strengthen the comprehensive utilization of bulk solid waste. Enhance the comprehensive utilization capacity of smelting slag, tailings , associated minerals, red mud and construction waste, and strengthen the efficient extraction and overall utilization of valuable components. Promote the diversified utilization of coal gangue according to local conditions. Broaden the way of comprehensive utilization of straw and improve the scientific and standardized level of straw returning. Promote the resource utilization of livestock and poultry breeding wastes.

The Action Plan requires that new domestic waste incineration projects should simultaneously implement fly ash treatment approaches and gradually reduce the amount of fly ash landfills. Optimize the structure of sludge treatment and disposal and reduce the scale of landfill.

The Action Plan also calls for further promotion of comprehensive treatment of phosphogypsum. "One reservoir, one policy" promotes the investigation and remediation of potential environmental risks in phosphogypsum reservoirs. Strengthen the environmental management of phosphogypsum storage, transportation and utilization, strictly implement the technical specifications for pollution control of phosphogypsum utilization and harmless storage, and seriously investigate and punish environmental violations related to phosphogypsum according to law. By 2027, Yunnan, Hubei, Guizhou, Sichuan, Anhui, Chongqing and other regions will complete the renovation of the stock of phosphogypsum. Resource utilization in

cement plant is one of the important ways to treat phosphogypsum and red mud.

In the treatment of phosphogypsum, taking Huanggang Yadong Cement Co., Ltd. as an example, the company invested 100 million yuan to build two 500000 tons of modified phosphogypsum powder production lines, using mixed technology, using carbide slag or quicklime to modify phosphogypsum, the modified phosphogypsum will reach or approach the quality of desulfurization gypsum and natural dihydrate gypsum. It can completely replace natural gypsum, change phosphogypsum from polluting waste into qualified cement retarder, and realize comprehensive utilization of resources.

In terms of red mud disposal, Guangxi Huazhong Building Materials Co., Ltd. handles 500000 tons of red mud comprehensive utilization project annually, and mixes red mud with other silica-alumina materials in an appropriate proportion as raw materials in cement clinker production. It is an effective way for the harmless treatment of red mud. It not only solves the problem of resource demand for cement production, but also is conducive to the treatment of red mud and waste residue, and improves the comprehensive utilization efficiency of resources.

In addition, cement kiln is also one of the best solutions for the harmless disposal of sludge, hazardous waste and waste incineration fly ash, and has a large number of disposal cases in the industry. At the same time, in the process of continuously promoting the goal of "double carbon", the cement industry is increasing the application of alternative fuels. As an important biomass fuel, straw is expected to play an important role in improving the utilization rate of alternative fuels in cement enterprises.