T/JSAS 057-2024 Iron tailings-based engineering fill material

Scope

Scope: This document specifies the technical requirements, test methods, inspection rules, and requirements for packaging, marking, transportation, and storage of backfill materials for iron tailings base projects. This document applies to the base layer filling of port roads and storage yards. Other industrial land (M), logistics and warehousing land (W), and road and traffic facilities land (S) can refer to this document for implementation. Main technical content: Backfill materials that meet the engineering application requirements after mixing iron tailings and solidifying materials in a certain proportion, compacting and curing. 4. Raw materials 4.1 Iron tailings Before using iron tailings, the hazardous waste attributes should be identified to exclude dangerous waste. At the same time, the heavy metal content in iron tailings should meet the limit requirements of the screening values for Category II land use specified in GB 36600-2018. The leachable heavy metals should meet the limit requirements in Table 3 of GB/T 30760-2024. Specific requirements are shown in Table 1. Table 1: Requirements for heavy metals in iron tailings raw materials **Heavy metal content limit values** **Heavy metal element** **Limit value (mg/kg)** 1 Arsenic 60 2 Cadmium 65 3 Chromium (hexavalent) 5.74 4 Copper 18,000 5 Lead 800 6 Mercury 387 7 Nickel 900 **Heavy metal leachable content limit values** **Heavy metal element** **Limit value (mg/L)** 1 Arsenic 0.12 2 Lead 0.33 3 Cadmium 0.034 4 Chromium 0.25 5 Copper 1.06 6 Nickel 0.27 7 Zinc 1.08 8 Manganese 1.04 4. Fly ash Fly ash shall meet the requirements of GB/T 1596-2017, Chapter 6.1, Grade II and above. 4. Cement Cement shall meet the requirements of GB/T 175-2023, Chapter 7.4, Grade 32.5 and above. 5. Mix proportion principles 5.1 The indoor mix proportion test should be designed according to the target use of iron tailings base pr

Development Information

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