Study On Performance And Application In Tailing Cementaion Of A Novel Composite Binding Materal

Binding materials is the core of slurry design in the tailings cementation process, as it is not only the key index of cementation strength but also the most important factor of technologic cost. So, the novel binding materials which are low cost and superior performances catch many scientist's attention in recent years.The project is aimed at that traditional binding materials have been being high dosage, high cost, and inferior performances, The composite binding material which is made of Portland cement and Modified slag cement, was discussed in this thesis. The ratio of raw binding materials, matching mechanism relationship between mixing ratio and tailing granularity and application of the novel binding material in the field of tailing cementation were mainly investigated. In order to develop a new composite binding material which is lower dosage, lower cost and more inferior performances .According to the study on ratio of the raw binding material, it was found that the matching relationship between composite ratio and tailing granularity existed. Tailing granularity is the key factor of optimal mixing ratio of the novel binding material. Based on the results of reseach, the characteristics of the novel binding material were summarized, meanwhile, the reason of superior performances were analyzed by composite theory. Hydration products and course were discussed through microcosmic analyze of the novel material were studied by SEM, EDS, XRD and DSC. Compared with silicate cement and sulphoaluminate cement, the novel composite binging material has its own hydration products, not containing hydrate aluminates and containing little or a little of calcium hydroxide. The hydration produces of the composite binding material were C-S-H gel or C-S-A-H gel. Based on above, the hydration mechanism is that one side, calcium hydroxide that is produced by silicate cement occur the second react to excitated the reaction of Modified slag cement. On the other hand, hydration products and course were determined by the "principle of crystalloid abduction". Then According to theories of filling aggregate, the cementation mechanism of the novel material was discussed. With the change of mixing ratio, its hydration products were different, which play either fill or framework sustain role in tailing cementation. Those explained the matching relationship between composite ratio and tailing granularity. At last, application of the novel binding material in the field of Bei Minghe iron mine tailing cementation as example, cementation strength model was set up through two way orthogonal regression design. Considering matching relationship between composite ratio of the novel material and tailing granularity, multiple factors orthogonal experiment and multiple linearity model were set up, in order to choose and control optimal condition in the application of binding materials.The conclusions of this thesis provides a certain theoretical base and technical foundation for the research on the novel tailings binding materials. Design of mathematics' model between cementation strength and technologic parameter can supervise the application of the novel binding material.