Investigation Of Preparation And Performance Of Foams From Waste Plate Glass

Foam glass is a kind of pure raw material or waste glass as the main rawmaterial, as well as foaming agent, cosolvent and accelerator as additive, viamelt, foaming, cooling process of the formation of internal full of connected orclosed porosity of the inorganic materials. Due to its advantages of low thermalconductivity, low expansion coefficient, waterproof, impermeable, non-inflammability, wide working temperature range, immunity from insect pest andstrong corrosion resistance. foam glass is much of a kind of the superiorperformance of heat insulation, sound absorption, moistureproof, fireproofingbuilding materials and decoration materials, which can be applied in the relevantfields.Silicate foam glass was prepared by mould-pressing sintering, using wasteplate glass, CaCO₃, Na2CO₃,（NaPO₃）6as the main raw material. Investigated indetails, the preparation technique of the foam glass was optimized through singlefactor experiment, Multi-target orthogonal test design and Response surfacemethodology. In addition, thermal change rule, raw material granularity andmicrostructure were characterized by differential scanning calorimeters-thermogravimetric analysis （DSC-TG）, laser particle size analyzer （LDSA）,scanning electron microscopy （SEM）, respectively. The physical and mechanicalproperties were analyzed by Archimedes buoyancy method and universalmaterial testing machine, respectively.1)A large number of gas production was founded to form near800℃inDSC-TG curve, indicating the foaming temperature of foam glass batch was nearthe temperature. Raw material granularity analysis shows that along with theextension of wet-grinding time, the D50of raw material decreases rapidly at first,and then the amplitude of decrease gradually diminish until close to the samelevel, the change trend consistent with shattering. 2)The gas flow and the pore size of sample increase with the increases ofcontent of foaming agent, while the walls of holes turn thinner at first thenthicker. The best homogeneity of the foams is found when3wt%of foamingagent is added; Increasing content of foaming agent, the volume density decreasefirst and then increase, the total porosity and apparent porosity changes on thecontrary, the mechanical properties decrease all along.3)The pore sizes and walls of holes of foam glass are found to beinfluenced by the foaming temperature and the holding time. It shows that highfoaming temperature and long holding time destroies pore structure; Along withthe foaming temperature rise or holding times increases, the volume density,compressive strength and flexural strength first decrease and then increase, thetotal porosity and apparent porosity show the opposite trend.4)The D50of raw material decreases with the increase of wet-grinding time.The apparent porosity increase as the wet-grinding time extended. The flexuralstrength and the compressive strength decrease as the wet-grinding timeprolonging. The longer the wet-grinding time, the higher the total porosity, thethinner the walls of holes, the better the diameter distributed in the foam glass.However, excessive wet-grinding time will generate a nonuniform distribution ofpore diameter.5)The Multi-target orthogonal test design optimization results indicate thatdifferent factors show diverse importance for different indicators; The optimalscheme through the integrated balance method analysis is A₂B₂C₂D₃, the optimalscheme is verified correct and reliable.6)The model from the response surface test design optimization results tallywell with the actual change of response value. Combined with the actualoperation, the optimization process through numerical analysis in a conditionsfor content of foaming agent3.2wt%, foaming temperature840℃, holdingtime62min, wet-grinding time56min. The volume density of foam glass in theconditions is close to the model prediction.