关键词: 固废, 胶凝材料, 尾矿, 重金属, 固化稳定化

Abstract: In order to realize the solidification and stabilization of heavy metal tailings in copper mine, according to the requirements of harmless disposal of heavy metals in a copper mine tailings in Yunnan, the whole tailings of copper mine were cemented and solidified by using the developed solid wastebased cementitious material. The unconfined compressive strength of the solidified body at each age and the leaching toxicity of heavy metals at 28 d were tested to investigate the cemented filling performance of the cementitious material and the solidification and stabilization performance of heavy metals. The test results show that the compressive strength of solid waste-based cementitious materials is high, which meets the technical requirements of mine filling mining technology. The leaching concentration of 28 d solidified weight metal is lower than the Class IV water limit in GB3838—2002, which can eliminate the hidden danger of heavy metals in tailings to the environment. The solid waste-based cementitious material is mainly composed of industrial solid waste such as slag, steel slag and desulfurization gypsum. It has low cost, high performance and wide application range. It realizes the resource utilization of solid waste and has broad prospects for industrial promotion.

Key words: solid waste, cementitious materials, tailings, heavy metals, solidification stabilization