关键词: 氟石膏, 多源固废, 胶结充填材料, 配比优化, XRD, SEM

Abstract: Aiming at the problems of low resource utilization rate of fluorogypsum，high cost and large carbon emission of mine filling materials，the ratio optimization of cemented filling materials pre⁃ pared by multi-source solid waste was studied with fluorogypsum，steel slag，fly ash and gold tailings as raw materials. The three-factor and three-level orthogonal test was used to test the compressive strength， slump，expansion and bleeding rate. The optimal ratio was determined by range analysis and variance analysis，and the better samples were characterized by XRD and SEM. The results show that the compres⁃ sive strength of each group of samples increases with the increase of age. The mass ratio of fluorgypsum to steel slag has the greatest influence on the strength，and the slurry concentration is the key factor affect⁃ ing the working performance and stability. The optimum ratio is that the mass ratio of fluorine gypsum to steel slag is 1∶1，the content of fly ash is 15%，and the slurry concentration is 80%. The corresponding compressive strength of 3，7 and 28 d is 0.92，2.64 and 5.56 MPa，respectively. The slump is 20.4 cm， the expansion is 44.6 cm，and the bleeding rate is 1.46%. Microscopic analysis showed that hydration products such as AFt and C—S—H gel were formed in the sample with better ratio，and the structure was dense. It is feasible to prepare cemented filling materials with multi-source solid waste，which can pro⁃ vide reference for the high-value utilization of fluorgypsum and the development of green mine filling mate⁃ rials.

Key words: fluorogypsum, multi-source solid waste, cemented filling materials, ratio optimization, XRD, SEM