铁尾矿-金尾砂-粉煤灰基地质聚合物的制备与表征OA

Long-term stacking of tailings will cause serious waste of land resources and may also pollute soil and groundwater.China attaches great importance to the treatment and disposal of solid wastes and has issued a series of policies and regulations to encourage and guide enterprises to continuously improve the comprehensive utilization level of resources.This article uses iron tailings,gold tailings and fly ash as raw materials to prepare a ternary solid waste based geopolymer.The optimum preparation conditions were obtained by exploring experiments and conditional expe-riments:the mass ratio of iron tailings to gold tailings was 1∶1,the content of fly ash was 40%,the modulus of sodium silicate was 1.3,the content of alkali activator was 9%,the ratio of water to cement was 0.15,and the curing temperature was 80℃.Under these conditions,the 3 d compressive strength of geopolymer prepared reached 33.5 MPa.Through XRD,FTIR,SEM-EDS characterization and analysis of the geopolymer test block at the initial stage of maintenance,it was found that a large number of gel like substances and zeolite crystals were produced by the reac-tion of raw materials with alkali activator.The newly generated substances and incompletely reacted raw materials together form the N-A-S-H system,forming a dense material structure and providing an early source of strength for geological polymers.This study has achieved the reuse of secondary resources of aluminosilicates,providing a new idea for the green and efficient treatment of high silica aluminum tailings and tailings.