T/SDGSY 21-2025 Technical regulations for soil ameloration of red mud with biomass and fly ash

Scope

1. Scope This document specifies the terms, definitions, product technical specifications, preparation methods, and inspection requirements for the preparation of red mud-based soil using biomass and fly ash. It is applicable to red mud mainly derived from the Bayer process, which is combined with biomass and fly ash and subjected to specific technical processing to endow it with physical, chemical, and biological functions and characteristics related to soil. It can be used as "artificial soil" to support the survival and growth of plants and microorganisms. After remediation, the red mud-based soil can only be used as ecological restoration soil in landscaped green spaces and mine rehabilitation sites, and should be avoided in environmentally sensitive areas (such as water sources, schools, hospitals, and residential green spaces). 5. Technical requirements for the remediation of red mud into soil Material requirements Red mud solid waste raw materials shall only be derived from red mud generated by the Bayer process. The pH of the raw materials shall be between 11 and 12, and they shall meet the requirements for Class I general industrial solid waste in GB 18599 and the utilization requirements specified in HJ 1091 standards. The auxiliary material, fly ash, shall only be derived from fly ash solid waste collected from thermal power plant boilers and meet the utilization requirements specified in HJ 1091 standards. The biomass auxiliary materials include, but are not limited to, agricultural and garden organic solid waste, livestock and poultry manure, etc. Pre-processing requirements for the raw materials used in the preparation of red mud-based soil The moisture content of the red mud raw materials shall not exceed 40%, and if the red mud raw materials are severely compacted into blocks, they shall undergo coarse crushing treatment to ensure that more than 90% of the particles have a diameter of less than 5 mm. The biomass raw materials used in the preparation

Development Information

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