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Characterization of sintered coal fly ashes

机译：烧结粉煤灰的表征

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Can, Catalagzi, Seyitoemer and Afsin-Elbistan thermal power plant fly ashes were used to investigate the sintering behavior of fly ashes. For this purpose, coal fly ash samples were sintered to form ceramic materials without the addition of any inorganic additives or organic binders. In sample preparation, 1.5 g of fly ash was mixed in a mortar with water. Fly ash samples were uniaxially pressed at 40 MPa to achieve a reasonable strength. The powder compacts were sintered in air. X-ray diffraction analysis revealed that quartz (SiO_2), mullite (Al_6Si_2O_(13)), anorthite (CaAl_2Si_2O_8), gehlenite (Ca_2Al_2SiO_7) and wollastonite (CaSiO_3) phases occurred in the sintered samples. Scanning electron microscopy investigations were conducted on the sintered coal fly ash samples to investigate the microstructural evolution of the samples. Different crystalline structures were observed in the sintered samples. The sintered samples were obtained having high density, low water adsorption and porosity values. Higher Al_2O_3 + SiO_2 contents caused to better properties in the sintered materials.
机译：Can，Catalagzi，Seyitoemer和Afsin-Elbistan火力发电厂的粉煤灰用于研究粉煤灰的烧结行为。为此，在不添加任何无机添加剂或有机粘合剂的情况下，烧结粉煤灰样品以形成陶瓷材料。在样品制备中，将1.5克粉煤灰在研钵中与水混合。粉煤灰样品在40 MPa下单轴加压以获得合理的强度。将粉末压块在空气中烧结。 X射线衍射分析表明，烧结样品中出现了石英（SiO_2），莫来石（Al_6Si_2O_（13）），钙长石（CaAl_2Si_2O_8），钠钙石（Ca_2Al_2SiO_7）和硅灰石（CaSiO_3）相。对烧结粉煤灰样品进行了扫描电子显微镜研究，以研究样品的微观结构演变。在烧结样品中观察到不同的晶体结构。获得具有高密度，低吸水率和孔隙率值的烧结样品。 Al_2O_3 + SiO_2含量越高，烧结材料的性能越好。

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