细粒铁尾矿制备再生骨料的工艺研究

Study on the Preparation of Recycled Aggregate Using Fine Iron Tailings

为解决工业固废铁尾矿难以利用的问题,开展了细粒铁尾矿制备再生骨料的工艺研究。以水泥为凝胶材料,通过水化反应粘结细粒铁尾矿和黄砂,并优化物料配比、养护方式和搅拌工艺,得到合格的骨料。结果表明,再生骨料的最佳制备条件为:铁尾矿75%、黄砂10%、水泥15%,三乙醇胺用量为水泥的0.01%。在成型压力为20 MPa、成型水分为13%的条件下,采用高速混合机的二次搅拌、覆膜养护,试样的28 d抗压强度可达33.760 MPa;再生骨料的坚固值、压碎值、有机物含量达到国家相应标准。

In order to solve the problem of difficult utilization of industrial solid waste iron tailings,process study for preparing recycled aggregates with iron tailings as raw materials were conducted.The cement was regarded as the gel material to bond fine iron tailings and sand through hydration reaction,and the material ratio,curing way and mixing method were optimized to obtain qualified aggregates.The research results showed that the best preparation conditions for recycled aggregates are iron tailings dosage of 75%,sand dosage of 10%,cement dosage of 15%and triethanolamine dosage of 0.01%cements contents.Under the condition of the molding pressure of 20 MPa and the molding moisture of 13%,adopting the secondary mixing of high speed mixer and covering plastic film,the 28 d compressive strength of the sample is 33.760 MPa.The firmness value,crushing value and organic contents of the recycled aggregates meet the corresponding national standards.