表面改性对铁尾矿基复合材料吸水性能的影响

Effect of Surface Modification on Water Absorption of Iron Tailings-based Composite Materials

以铁尾矿为原料,采用N,N-亚甲基双丙烯酰胺表面改性经交联反应制备铁尾矿基复合材料。通过研究改性过程中铁尾矿粒度、改性剂浓度、改性时间和温度等因素对制备的铁尾矿基复合材料吸水性能的影响,得到各因素影响复合材料吸水率的主次顺序为:改性温度>改性剂浓度>改性时间>矿粉粒度,最佳改性条件为:矿粉粒度95~105μm,温度20℃,搅拌时间6 h,改性剂浓度0.25%。所制备的铁尾矿基复合材料的吸水率可达76.8%,保水性能随着时间增加和温度升高呈降低趋势;吸盐水率为68.6%,耐盐性能较好。

W ith iron tailings as raw m aterials,iron tailings-based composite materials were prepared by cross-linking reaction with N,N-methylene bisacrylamide as surface m odifier.The effects ol iron tailings particle size,modifier concentration,modification time and temperature on the water absorption properties of the iron tailings-based composite materials in the process of iron tailings modification were investigated,showing these factors binging impact on the absorption properties of composite in the following order:modification temperature>modifier concentration>modification time>iron tailings particle size.The optimum conditions for the modification were obtained as follows:particle size at 9 5~105 pm for ore powder,temperature of 20℃,modification time of 6 h and modifier concentration of 0.25%.The water absorption rate of the prepared iron tailing-based composite materials reached 76.8%.The water retention capacity decreased with the increase of time and temperature.The salt water absorption rate was 68.6%,indicating that the salt tolerance was excellent.