Study on the Optimization of Proportion of Fly Ash-Based Solid Waste Filling Material with Low Cost and High Reliability

In order to solve the problem of high cost coal-based solid waste bulk stacking and paste filling in large-scale coal electrification base East NingXia, this study, fly ash is skillfully used replace broken gangue as mixed material. As using a jaw crusher for crushing large expensive, its energy consumption relatively high, filler aggregate studied through micro macro test analyses. Using response surface methodology design software, 29 groups mix proportion schemes are designed obtain best proportion. addition, radar results slump, slump flow, comprehensive strength obtained by normalization method. According chart three normalized indexes, optimal ratio parameters follows: phase 79%, mass cement (FA/C) 6:1, concentration 78%, gasification slag 1:1, show that σ3d = 2.20 MPa, 205 mm, flow 199 mm. Taking concentration, FA/C, content phase, gangue-to-gasification independent variables, influence single-factor multi-factor interactions variables analyzed based on model. It found FA/C have very significant effect early strength. Replacing with can effectively reduce provide low-cost highly reliable technical reserves filling.