Experiment Research On Mechano-Chemistry Activating Coal Gangue

Coal gangue is industrial solid residues that are discharged when coal mine is built, coal is excavated and processed in the production course of coal mine, and is one of the most industrial solid castoffs in our country. Its major chemical compositions are SiO2 and Al2O3 etc., and its mineral compositions mainly are clay minerals such as Kaolinite, Illite,Montmorillonite and Boehmite, Quartz, Calcite, Pyrite, Feldspar and so on. Coal gangue that stored up in large quantities not only blocks the sustained development of coal mine, but also seriously pollutes the environment. Therefore the disposal and the efficient use of coal gangue have become an environmental problem. Many countries in the world pay attention to the application of coal gangue and regard it as a kind of new resource. In recent years, coal gangue more and more extensively has been synthetically used at home and abroad, among which it was applied to research on the production of cement excessively, but its utilization rate has been lower and now the comprehensive utilization rate in our country does not go to 15% yet.In order to meet the need of sustainable development strategy, the basic research about coal gangue has already been included in'973'plan of country, namely"national key basic research development programming"project (serial number: 2001CB610703). This subject arises at the historic moment in the project, and its purpose is to offer feasible experiment basis for comprehensive utilization of this kind of waste residue effectively through the research of activation course of coal gangue used for complementary cementitious component.In the past years, the research on mechano-chemistry has drawn attentions of increasing researchers. It was already proved that the mechanical crushing, especially the super-fine crushing was not a simple physical process, but a kind of complicated physical-chemical process. Mechano-chemical effect brought in the process of mechanical force acts on solid can activate its potential reactivity. The mechano-chemistry was the science on the change of solid status, crystalline structure...