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以Cr Cl_3·6H_2O作为三价铬源,采用碱激发和水热法制备了掺Cr~(3+)偏高岭土-粉煤灰基地聚合物。研究了掺Cr~(3+)偏高岭土-粉煤灰基地聚合物的结构组成、微观形貌、力学性能以及Cr~(3+)的固化机理和固化率。XRD研究结果表明:掺Cr~(3+)偏高岭土-粉煤灰基地聚合物的物相组成主要为无定形相,改变水热温度(60~180℃)和Cr~(3+)掺量不会影响其物相组成。抗压强度测试结果表明:掺Cr~(3+)偏高岭土-粉煤灰基地聚合物具有较高的力学性能且抗压强度随着Cr~(3+)掺量的增加先增大后减小。FT-IR和毒性浸出结果表明:Cr~(3+)能够以化学吸附的形式参与聚合反应而被固定,偏高岭土-粉煤灰基地聚合物对Cr~(3+)的固化率均在99%以上。
With Cr Cl 3 · 6H 2 O as the source of trivalent chromium, alkali-activated and hydrothermal method was used to prepare Cr 3+ metakaolin-fly ash base polymers. The structure, microstructure, mechanical properties, Cr 3+ solidification mechanism and curing rate of Cr 3+ metakaolin-fly ash base polymer were studied. The results of XRD showed that the phase composition of Cr 3+ metakaolin-fly ash base polymer was mainly amorphous phase. The hydrothermal temperature (60-180 ℃) and Cr 3+ content Will not affect its phase composition. Compressive strength test results show that polymer with Cr 3+ metakaolin-fly ash base has higher mechanical properties and compressive strength first increases and then decreases with the increase of Cr 3+ content small. The results of FT-IR and Toxic leaching showed that Cr 3+ could be involved in the polymerization reaction by chemical adsorption, and the cure rate of Cr 3+ in the metakaolin-fly ash base polymer was 99% %the above.