影响粉煤灰泡沫玻璃质量的因素研究

本文对发泡剂种类与掺量、发泡温度、发泡时间、烧结温度、烧结时间、粉煤灰细度与掺量、稳定剂种类与掺量对粉煤灰泡沫玻璃质量的影响进行了研究，找出了生产粉煤灰泡沫玻璃的最佳参数，粉煤灰泡沫玻璃性能优良，可作为隔热保温材料的换代产品。     

工艺制度对粉煤灰泡沫玻璃性能的影响研究

以废玻璃和粉煤灰为主要原料，并添加发泡剂、助熔剂、稳定剂制备出了粉煤灰泡沫玻璃。通过改变玻璃颗粒、发泡温度、发泡时间等工艺因素，研究了泡沫玻璃的性能与工艺制度变化的关系，分析了影响泡沫玻璃质量的工艺因素。     

粉煤灰微晶玻璃的研究进展

综合分析了国内外粉煤灰微晶玻璃的研究现状。综述了粉煤灰微晶玻璃的主要原料、原料配比、晶核剂的发展方向、制备工艺及复合型粉煤灰微晶玻璃的研究趋势及应用前景，作为一种新型绿色材料，粉煤灰微晶玻璃在建筑装饰领域将具有广阔的发展前号。     

影响粉煤灰泡沫玻璃质量的因素研究

研究了发泡剂种类与掺量、发泡温度与发泡时间、烧结温度与烧结时间、粉煤灰细度与掺量以及稳定剂种类与掺量对粉煤灰泡沫玻璃质量的影响 ,探索了生产粉煤灰泡沫玻璃的最佳参数。粉煤灰泡沫玻璃性能优良 ,可作为隔热保温材料的换代产品     

粉煤灰在微晶玻璃中的应用

本文介绍制造粉煤灰微晶玻璃的方法，确定了微晶玻璃的基础玻璃配方、粉煤灰的合理引入量及晶核剂类型，测定了微晶玻璃制品的理化性能     

粉煤灰微晶玻璃的试验研究

本文以工业废弃物粉煤灰和废玻璃为主要原料,添加适量化学纯试剂,采用烧结法制备了CaO-Al2O3-SiO2系粉煤灰微晶玻璃。运用X射线衍射(XRD)对粉煤灰微晶玻璃进行了研究,并测试了粉煤灰微晶玻璃的密度。通过分析了粉煤灰添加量对微晶玻璃试样影响。实验结果表明:粉煤灰微晶玻璃的主晶相为硅灰石,次晶相为副硅灰石;粉煤灰添加量达到35%时,粉煤灰微晶玻璃性能最佳。     

粉煤灰微晶玻璃研究进展

综述了近年来国内外粉煤灰微晶玻璃的研究进展,包括粉煤灰微晶玻璃的主要原料、配方、制备工艺、晶核剂、粉煤灰微晶玻璃的复合化,并展望了粉煤灰微晶玻璃的研究发展方向。作为一种质优价廉的绿色环保材料,粉煤灰微晶玻璃具有广阔的发展前景。     

粉煤灰泡沫玻璃工艺性能的研究

以粉煤灰和废玻璃为主要原料，添加适量发泡剂、助熔剂等制备粉煤灰泡沫玻璃。讨论分析了成型压力和退火制度等工艺过程对泡沫玻璃性能的影响。     

熔制低钙粉煤灰玻璃的几个工艺问题

粉煤灰熔制饰面玻璃受其品种的影响较大,高钙粉煤灰熔制玻璃比低钙粉煤灰容易且粉煤灰的用量大.低钙粉煤灰玻璃化温度高,难以澄清.本文对低钙粉煤灰熔制玻璃的一些工艺问题进行了分析和讨论.     

废玻璃、粉煤灰人造大理石的研制

以废玻璃和粉煤灰为原料成功地研制出一种新型人造大理石，其原料来源广泛，废物利用，成本低，理化性能好，工艺简单。它的研制成功为废玻璃和粉煤灰的利用开辟了新的途径，也为现代装饰业推出了新一代装饰材料。     

循环流化床粉煤灰的组成形貌与性能研究

通过X-射线衍射分析、扫描电镜、需水量比和强度活性指数试验,研究了循环流化床粉煤灰的组成、形貌及性能。研究结果表明,循环流化床粉煤灰与煤粉燃烧锅炉粉煤灰相比,其玻璃相含量较低,颗粒形状多数不规则,表面粗糙,且烧失量一般也较高。循环流化床粉煤灰的需水量比较大,其强度活性指数也较低,部分循环流化床粉煤灰的强度活性指数还低于70.0%。使用粉煤灰需注意循环流化床粉煤灰与煤粉燃烧锅炉粉煤灰的差别。     

Hydration of fly ash cement

It is necessary to establish the material design system for the utilization of large amounts of fly ash as blended cement instead of disposing of it as a waste. Cement blended with fly ash is also required as a countermeasure to reduce the amount of CO₂ generation. In this study, the influences of the glass content and the basicity of glass phase on the hydration of fly ash cement were clarified and hydration over a long curing time was characterized. Two kinds of fly ash with different glass content, one with 38.2% and another with 76.6%, were used. The hydration ratio of fly ash was increased by increasing the glass content in fly ash in the specimens cured for 270 days. When the glass content of fly ash is low, the basicity of glass phase tends to decrease. Reactivity of fly ash is controlled by the basicity of the glass phase in fly ash during a period from 28 to 270 days. However, at an age of 360 days, the reaction ratios of fly ash show almost identical values with different glass contents. Fly ash also affected the hydration of cement clinker minerals in fly ash cement. While the hydration of alite was accelerated, that of belite was retarded at a late stage.     

不同影响因素下粉煤灰再生保温混凝土力学与导热性能分析

制备了粉煤灰再生保温混凝土,分析了其抗拉压强度和导热性能随再生骨料替代量、粉煤灰掺量、玻化微珠掺量和水胶比等因素的变化规律。研究成果表明:粉煤灰再生保温混凝土的抗压和抗拉强度随再生骨料取代量和水胶比的增大而呈指数衰减式减小,随粉煤灰掺量和玻化微珠掺量的增大是先增大而后减小;粉煤灰再生保温混凝土的导热性能随再生骨料取代量、玻化微珠掺量和水胶比的增大而减小,随粉煤灰掺量的增大则先增大而后减小。     

建筑保温隔热弹性腻子的研制

介绍了建筑外墙用保温隔热弹性腻子的原材料、基本配方、制备工艺和施工方法,其功能性填料是用工业废渣粉煤灰漂珠代替价格昂贵的玻璃空心微珠,所研制的弹性腻子干密度低、保温性能好,其腻子层能在遮蔽保护层裂缝、防止装饰涂膜开裂、增强保温隔热效果、提高节能效率方面发挥重要作用,具有较好的应用前景。     

石膏陶瓷材料的研制

以工业废料—氟无水石膏为基础,并引入磷酸钠和钠水玻璃,生产出了一种石膏陶瓷装饰材料。这种材料易于磨削、抛光,不集聚静电,并拥有与大理石相似的纹理。     

不烧粉煤灰耐火材料的研制

分析了电厂粉煤灰的化学组成和活性，并以水玻璃为结合剂，采用干粉煤灰、矾土熟料、粘土等制成了不烧窑车台面砖和浇钢砖。     

X-ray powder diffraction-based method for the determination of the glass content and mineralogy of coal (co)-combustion fly ashes

The relevance of Al-Si glass in a number of fly ash applications, such as use as a pozzolanic material, zeolite synthesis, and geopolymer production, necessitated research towards investigation of methods for an easy and consistent determination of the glass content in this coal (co)-combustion by-products. A glass standard-addition X-ray powder diffraction (XRD)-based method is proposed in this study as an alternative to the non straightforward procedure of conventional methods for determining the amorphous components, mainly by difference of the total mass and the addition of quantified crystalline species. A >99% Al-Si glass slag sample was selected as a standard for glass. A number of glass standard/fly ash mixtures were performed on Fluidized Bed Combustion (FBC) and pulverized coal combustion (PCC) fly ashes and subsequently analyzed by XRD. The method provides results closer to quantitative proportions of the Al-Si amorphous material of this (co)-combustion by-product, with a range of values <3% when compared with those obtained by the conventional Reference Intensity Method (RIM) method, demonstrating suitability and consistence of the procedure. Furthermore, by the proposed method, the requirement of previous determination of the mineral phases of conventional techniques is avoided. Coupled with the easy calculations, this allowed a fast determination of the glass content of (co)-combustion fly ash. The mineralogy of FBC and PCC fly ash was also investigated using the RIM method. The occurrence and proportions of the crystalline components in fly ash are in line with the combustion technology and their inherent operational parameters, especially the (co)-combustion temperature. The FBC fly ash shows the highest content of relic phases from feed coal (quartz, illite, calcite, and feldspars) and lower contents of amorphous components. The PCC fly ash are characterized by the highest proportions of mullite and Al-Si glass and low contents of quartz an other relict phases. The occurrence and distribution of anhydrite and Fe-oxide species appears to be related to the content of Ca and Fe in the feed fuels, showing slightly higher contents in FBC than in PCC fly ash.     

Utilization of by-products from western coal combustion in the manufacture of mineral wool and other ceramic materials

The ash by-products from combustion or gasification of western U.S. coals have chemical and mineralogical characteristics that lend themselves to utilization in ceramic materials. Laboratory and pilot-scale fabrication of four such materials has been studied. Cyclone slag from four lignite-fired power plants and a dry scrubber ash have been fabricated into mineral wool insulation in a pilot-scale cupola. Extruded and fired mixtures of fly ash, clay and ground glass have produced ceramics with extraordinary high flexural strength. Ceramic glazed wall tile that utilize fly ash in place of clay have been prepared and shown to meet most specifications for fired clay tile. Both fired and unfired dry-pressed brick containing 100% western fly ash have met ASTM specifications for fired clay brick.     

Characterization of coal fly ash for possible utilization in glass production

The recycling of three different fly ashes obtained from the coal fired thermal power plants has been studied. Coal fly ashes were vitrified by melting them at 1773 K for 5 h without any additives. After the glass production, glass samples were subjected to a heat treatment process to be able to see whether or not the glasses could be transformed into a microcrystalline structured materials. Produced glass samples were heated to 1423 K and held at this temperature for 2 h to determine the effect of heat treatment process on the properties of glasses. The properties of glass and the heat treated glass samples produced from coal fly ash were investigated by means of differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. DTA study indicated that there were only inflection points of the endothermic peaks in the DTA curves of the glass samples. XRD analysis showed the amorphous state of the glass samples and also the presence of only the diopside phase in the heat-treated glass samples. SEM investigations revealed that small amount of crystallites occurred in the microstructure of the heat treated glass samples in contrast to the amorphous structure of the glass samples. The mechanical, physical and chemical properties of the heat-treated glass samples are found better than those of the glass samples. Toxicity characteristic leaching procedure (TCLP) results showed that the heavy metals of fly ashes were successfully immobilized into both glass and heat treated glass samples. It can be said that glass and heat treated glass samples obtained by the recycling of coal fly ash can be taken as a non-hazardous material. Overall, results indicated that the vitrification technique is an effective way for the stabilization and recycling of coal fly ash.     

Leaching characteristics of selected Korean fly ashes and its implications for the groundwater composition near the ash disposal mound

Currently only 20% of the fly ash produced in Korea is utilised for industry, and the remainder is disposed as waste in landfill sites. Both anthracite and sub-bituminous coals are burnt in Korea. Fly ash and coal samples were collected from five different coal-fired power stations in Korea and analysed for their chemistry and mineralogy. Batch leaching tests were also carried out to investigate the leaching behaviour of selected fly ashes. The fly ash leachate chemistry was compared with the groundwater taken directly from the monitoring well installed in one of the power stations. The anthracite coals contain illite, pyrophyllite and kaolinite whereas kaolinite is the representative clay mineral for the sub-bituminous coals. Anthracite coals were higher in Si, Al and K than the sub-bituminous coals, reflecting higher mineral matter contents in the anthracite coals. Mullite and quartz are the main mineral phases for two different types of the fly ashes, with some iron oxides. The chemical compositions of the anthracite and sub-bituminous fly ashes are comparable with each other, except for extraordinary high concentrations of Cr for one anthracite fly ash. Most of the trace elements in the ash were enriched in the finer fraction, indicating surface associations. Although, some elements including Na, K, Ca and Cu were released rapidly in the initial stage of leaching, measurable amounts of metals were still detectable in the fly ash leachate treated several times with distilled water. Such leaching behaviour indicates slow and long-term leaching of elements associated with the glass fractions of the ash particle. This was confirmed by leaching of weathered fly ash, which had been disposed of for several years. Comparison of the ash leachate, treated with 0.1N-HCl, fly ash slurry in the ash pond and the groundwater indicate the influence of the ash leachate from the ash disposal mound on the groundwater composition.