| With the improvement of China’s industrialization level, our resources and energycrisis become more serious. As the country that lack of resources, requires us to use ofenergy reasonably and explore the new energy products. Diatomite is well known as anatural mineral deposition from unicellular diatomaceous plant, prospective reservesin China reached as many as2billion and distributed widely. So this new material hasaroused widespread concern in recent years. Since the beginning of the1950s,diatomaceous is widely used in the preparation of new environmentally friendlybuilding materials, because of its porous and lightweight, non-toxic and easyadsorption characteristics. It is with great significance for the development of the fieldof building materials and promotes the development of energy saving of modernarchitectural decoration industry. And in recent years, as people’s awareness ofenvironmental protection, recycling of solid waste has become a focus of attention. Soin recent years, the emerging a new material at home and abroad-diatomite withmicroporous structure prepared an excellent environmentally friendly buildingmaterial. Due to the special physical and chemical properties of diatomite, these kindsof products having the numerous features: low density, thermal insulation, soundinsulation, water proof, non-combustible, environmentally friendly, air purification,etc. So the main content of this research is how to prepare environmental porousinsulation materials use diatomaceous earth.We with reference to CaO-Al2O3-SiO2and CaO-MgO-SiO2ternary phasediagram, confirms the chemical composition range and the best prescription for body,through choosing raw materials rationally, such as dolomite that can be fired soonwith suitable low temperature and low shrinkage, and fly ash and treated sludge asadditive, glass powder as solution for producing the porous thermal insulationmaterial. Referring some experience recipes, and use of orthogonal、 contrastexperimental design, and the analysis method of XRD and SEM. We can confirms thebody’s sintering schedule is temperature-gradient method combined with fast or slowfiring method through the DTA of the body before firing, in order to ensure theexhaust gases during sintering blank and keep the product appearance intact aftersintering, avoid pinholes and cracks. In addition, the experiment also selects thereasonable additives and appropriate preparation process, in order to ensure productperformance while reducing power consumption as much as possible. The analysis’results of SEM and XRD shows a large number of liquid formed in blank during thefiring. SEM shows that most of the pore structure was not destroyed in the processfiring. We token the Archimedes principle, omnipotence test-instrument, and so on tocharacterization of insulating brick porosity、bending strength, etc. Discusses theeffect of the insulation brick’s properties when sintering temperature, holding time,the molding pressure and the addition of diatomite and dolomite have change. Andalso studied the different solid wastes as performing agent join in the material formulations.The result show that: mainly crystalline phase of body is mullite、anorthite anddiopside, percent of diatomite was52%, and dolomite percent of was26.5%, andtreated-sludge was6%, percent of fly ash was9.5%and rubbish glass powder was6%, and additional join shell was20%. molding pressure was15MPa, firedtemperature was1020℃, holding temperature time was30min, water absorption ofpermeable brick was28.6%, porosity was53%, density was1.01g/cm3, modulus ofrupture was10.03MPa, thermal conductivity was0.03w/m k．... |
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