Chen Changshuai, Sasaki Keiko, Tian Quanzhi, Zhang Haijun
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116Jiangsu ,China.
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116Jiangsu ,China.
ACS Omega. 2023 Oct 13;8(42):39366-39375. doi: 10.1021/acsomega.3c04926. eCollection 2023 Oct 24.
This study investigated the one-part geopolymer synthesis by coal gasification slag through a calcination treatment. Two preparation methods, the traditional alkali fusion method (M-I) and the alkali fusion and modification method (M-II), were compared to illustrate the more suitable way for coal gasification slag-based one-part geopolymer (CGS-based geopolymer) synthesis. The reaction products and structure of the geopolymer were tested by XRD, FTIR, TG-DTG, and SEM. The results showed that the compressive strength of geopolymers prepared by M-I was raised as the NaOH amount increased, and the maximum compressive strength of geopolymers was achieved at 8.44 MPa. The low compressive strength suggested that M-I failed to be used for CGS-based geopolymer synthesis. When solid NaOH was selected for one-part geopolymer synthesis by M-II, the geopolymer possessed a compressive strength of 25.52 MPa and exhibited a well-combined and dense matrix. More Si and Al species in F-SH could be released for geopolymerization, and the coal gasification slag additive could be partially dissolved and act as the filler in the geopolymer matrix, which enhanced the geopolymerization degree. The M-II has been proven to be more suitable for preparing CGS-based geopolymers than the M-I.
本研究通过煅烧处理研究了利用煤气化炉渣合成单组分地质聚合物的方法。比较了两种制备方法，即传统碱熔法（M-I）和碱熔改性法（M-II），以说明更适合合成基于煤气化炉渣的单组分地质聚合物（CGS基地质聚合物）的方法。通过XRD、FTIR、TG-DTG和SEM对地质聚合物的反应产物和结构进行了测试。结果表明，采用M-I制备的地质聚合物的抗压强度随着NaOH用量的增加而提高，地质聚合物的最大抗压强度在8.44MPa时达到。低抗压强度表明M-I不能用于CGS基地质聚合物的合成。当采用M-II选择固体NaOH进行单组分地质聚合物合成时，地质聚合物的抗压强度为25.52MPa，且基体结合良好、致密。F-SH中更多的Si和Al物种可以释放出来用于地质聚合，煤气化炉渣添加剂可以部分溶解并作为地质聚合物基体中的填料，从而提高了地质聚合度。已证明M-II比M-I更适合制备CGS基地质聚合物。
