以固体废物为原料制备地聚合物

Geopolymer synthetized from bottom coal ash and calcined paper sludge
Experimental bottom ash： dry in a laboratory stove for 24 h at 100℃ ground in a laboratory ball mill for 8 h evaluate the particle size distribution paper sludge：
Results
Geopolymer synthetized from bottom coal ash and calcined paper sludge
Results
XRD
Q ：alpha-quartz
Z ：Al-Si zeolites
Geopolymer synthetized from bottom coal ash and calcined paper sludge
Cd Pb
Leachin g test
Cr
A double step washing treatment
Zn
Cl-
SO42
-
Recycling of Pre-Washed Municipal Solid Waste Incinerator Fly Ash in the Manufacturing of Low Temperature Setting Geopolymer Materials
qualitative means
FTIR
XRD
SEM
GAAR 28 days
GAw 28 days
Recycling of Pre-Washed Municipal Solid Waste Incinerator Fly Ash in the Manufacturing of Low Temperature Setting Geopolymer Materials
以固体废物为原料制 备地聚合物
概述
什么是地聚合物？
• 20 世纪 70 年代，法国材料学家Joseph Davidovits提出了地聚合物(Geopolymer)的概念， 地聚合物是由硅铝原料通过矿物缩聚而生成的一 种具有无定形三维网络状结构的无机胶凝材料。 • 地聚合物兼有陶瓷、水泥、高分子材料的特点， 其高强、高韧、耐腐蚀、耐火、重金属固封等优 异性能使得地聚合物可广泛应用于建筑材料、固 封核废料、废弃物处理和航空航天材料等领域。 同时，地聚合物的生产能耗和“三废”排放量极 低，是一种环境友好型材料。
calcined paper sludge
Sodium hydroxide(97% purity) alkaline activators sodium silicate(SiO2/Na2O=3.3) XRF XRD analysis methods SEM FTIR
compressive strength tests
The samples were characterized by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and scanning electron microscopy (SEM)
Geopolymer synthetized from bottom coal ash and calcined paper sludge
cause the dehydroxylation of kaolin adjust the particle size distribution
Geopolymer synthetized from bottom coal ash and calcined paper sludge
Experimental The bottom ash and the calcined paper sludge were weighed and mixed and the sodium hydroxide and sodium silicate were added using a mechanical stirrer until complete homogenization of the mixture for about 5 min
谢 谢！
The geopolymeric paste was poured into plastic containers (62.83 cm3) and cured at room temperature
After 1、7、28、90 days the samples were demolded and tested for compressive strength.
Results
FTIR
Determine the functional groups and atomic arrangements in the aluminosilicates
Geopolymer synthetized from bottom coal ash and calcined paper sludge
Mx[—(SiO2)z—AlO2—]n· wH2O
M：碱金属元素 x：碱金属离子数目 z：硅铝比(1、2、3) n：缩聚度 w：化学结合水的数目
Geopolymer synthetized from bottom coal ash and calcined paper sludge
Bottom ash from coal burning raw materials
Municipal Solid Waste Incinerator Fly Ash(MSWI-FA/)
received coal fly
after water washing MSWI-FA/coal fly =75/25
Cylindrical samples (diameter 3 cm, height 6 cm) have been prepared by pouring each mixture into polyethylene moulds
hydrochloric acid treatment
wash with deionized water dry at 100℃ for 24 h calcine at 850℃ for 2 h ground in a ball mill for 8 h
remove the CaCO3 remove the residue of calcium chloride
概述
地聚合物反应机理
•Glukhovsky模型----含活性硅铝相材料受碱激发的反应机理模型 •该模型把地聚合反应分为 3 个阶段： 解构–重构阶段； 重构–凝聚阶段； 凝聚–结晶阶段。 •聚合反应主要包括5 个层次： 溶出 物相平衡 凝胶化 重构 聚合与硬化
ห้องสมุดไป่ตู้概述
地聚合物的结构
• 地聚合物缩聚大分子的结构通式为：
Samples have been cured for 3,14,28 days at 60 °C in oven under 100% relative humidity conditions
Recycling of Pre-Washed Municipal Solid Waste Incinerator Fly Ash in the Manufacturing of Low Temperature Setting Geopolymer Materials
Results
SEM
Recycling of Pre-Washed Municipal Solid Waste Incinerator Fly Ash in the Manufacturing of Low Temperature Setting Geopolymer Materials
non-hazardous wastes limits for landfilling hazardous wastes
quantitative means
determine of the volume of reacted water and silicate
Recycling of Pre-Washed Municipal Solid Waste Incinerator Fly Ash in the Manufacturing of Low Temperature Setting Geopolymer Materials