Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

The filling mining method is important in realizing the green of mineral resources. Aiming at problems land resource occupation, environmental pollution, and rational utilization coal-based solid wastes such as coal gangue, fly ash, desulfurization gypsum, a new paste material was developed with gypsum raw materials. microstructure materials analyzed by XRD SEM. Combined Box-Behnken experimental design, effect each component on fluidity slurry through response surface analysis. significance its bleeding determined, optimal ratio obtained. Experimental results show that microcosmic morphology gasification slag presents an irregular block rough particle surface; ash bottom first out spherical or quasi particles. Moreover, obvious sintering traces exist slag. main crystal gangue SiO2, composed Ca(SO4) (H2O) Ca(CO3) minerals, carbon nitrogen compounds, components sample are SiO2 AlxSiyOz compounds. order key factor follows: C (desulfurization gypsum) > D (gasification 1:1) A (coal gangue) B (fly ash). ash) gangue). Considering preparation, field application, other conditions, mass percentage content 49.5% 8.3% 4.1% 6.2% slag,