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An account of the results of a systematic investigation on the effects of percolation by solutions of magnesium sulphate and magnesium chloride of the same normality, respectively, through mortar samples manufactured with different types of cement is given by the Authors. The aim of the investigation is the comparative evaluation of the behaviour of the single cements under the attack from the two aggressive solutions, as well as the search for possible relationships between the manifold factors responsible, to a different extent, for the lowering of the mechanical strength of the resultant mortars. 相似文献
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研究了在不同温度下处理的脱硫石膏对矿渣水泥若干性能的影响,确定其在水泥基材料中循环利用的可行性。研究结果表明,经低温烘干焙烧处理的脱硫石膏,掺入到矿渣水泥中并控制适当的SO3掺量,水泥凝结时间正常,强度略有提高,并且明显降低了硬化水泥浆体的失水率和干缩率,可以有效防止收缩裂缝的产生:并进一步探讨了脱硫石膏对矿渣水泥性能的影响机理。 相似文献
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电解锰渣是电解锰加工行业中常见的一种工业固废,目前的处置方式主要为地下填埋或者露天堆存,其大量无序堆放带来了严重的环保问题。随着新环保法的实施,地方政府和电解锰加工企业面临的环保形势更加严峻,电解锰渣的合理处置成为地方经济社会发展所面临的重要核心问题。采用德国布鲁克元素分析仪等仪器设备对电解锰渣的特性进行了分析和研究,通过将电解锰渣与工业石膏搭配用作水泥缓凝剂,探索了在水泥生产过程中资源化利用电解锰渣的可行性,具有良好的环保效应和经济效益,对于电解锰渣的有效处置具有一定的参考价值。 相似文献
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Compressive strength and hydration characteristics of wastepaper sludge ash-ground granulated blastfurnace slag (WSA-GGBS) blended pastes were investigated at a water to binder (w/b) ratio of 0.5. The strength results are compared to those of normal Portland cement (PC) paste and relative strengths are reported. Early relative strengths (1 day) of WSA-GGBS pastes were very low but a marked gain in relative strength occurred between 1 and 7 days and this increased further after 28 and 90 days. For the 50% WSA-50% GGBS blended paste, the strength achieved at 90 days was nearly 50% of that of the PC control paste. Transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric (TG) analysis were carried out to identify the mineral components in the WSA and the hydration products of WSA and WSA-GGBS pastes. The principal crystalline components in the WSA are gehlenite, calcium oxide, bredigite and α′-C2S (stabilised with Al and Mg) together with small amounts of anorthite and calcium carbonate and traces of calcium hydroxide and quartz. The α′-C2S and bredigite, which phase separate from liquid phase that forms a glass on cooling, are difficult to distinguish by XRD. The hydration products identified in WSA paste are CH, C4AH13, C3A.0.5CC?.0.5CH.H11.5 and C-S-H gel plus possible evidence of small amounts of C2ASH8 and C3A.3CS?.H32. Based upon the findings, a hydration mechanism is presented, and a model is proposed to explain the observed strength development. 相似文献
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《Cement and Concrete Research》1985,15(3):545-548
Study of standard petrographic thin sections of concrete by means of polarised light microscopy has been found to provide a rapid method of establishing the presence of milled granulated blastfurnace slag (MGBS) in hardened concrete. Comparison of thin sections prepared from concrete with known cement: MGBS ratios with thin sections of other MGBS containing concretes permits assessment of the MGBS contents of the latter. 相似文献
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提高矿渣水泥中矿渣掺量的试验研究 总被引:1,自引:1,他引:0
大幅度提高水泥中矿渣掺量、相应降低水泥熟料含量,必然引起水泥性能的变化。本研究采用适当的技术措施提高矿渣水泥中矿渣掺量,改善水泥的早期性能,提出了#425矿渣水泥的合理配比,采用了XRD、SEM、DTA等测试技术分析了该种水泥的水化产物及其水化机理。采用的技术措施简单,利于生产控制,生产的水泥性能稳定、成本低、能耗少。 相似文献
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“电石渣-石膏”法烟气脱硫工艺及脱硫石膏的综合利用 总被引:1,自引:0,他引:1
结合新疆天业(集团)有限公司4×135MW机组烟气脱硫工程的实施情况,介绍了“电石渣-石膏”法烟气脱硫工艺的特点,并指出了脱硫石膏的综合利用途径。 相似文献
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介绍山东鲁北企业集团总公司利用工业副产石膏制硫酸和水泥装置的技术发展历程及11项技术创新改造成果。通过开展系列新技术、新装备的创新改造,使装置生产能力翻一番,总能耗降低50%,具有较好的推广应用价值。 相似文献
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电石渣制水泥的可行性研究 总被引:3,自引:2,他引:1
从市场、工艺、原料、投资回收等方面对电石渣制水泥项目的可行性进行了探讨,认为用电石渣制水泥具有技术成熟、经济可行等优点。建议电石法PVC生产厂在条件成熟时尽快实施这一项目。 相似文献
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每生产1 t黄磷产出9~11 t黄磷渣。介绍利用黄磷渣生产磷渣超微粉(0.074~0.038 mm)的工艺及其作为水泥添加剂的成本和品质优势,并已成功将其用于修建大坝和商业用混凝土中,实现了黄磷渣的循环利用和保护了环境。 相似文献
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<正>天然石膏是目前水泥行业使用最广泛的缓凝剂原材料,但由于天然石膏为不可再生资源,随着我国水泥工业的不断发展、水泥产量的不断增加,优质的天然石膏资源日益匮乏,价格也是逐年升高。我公司也同样遇到了天然石膏的资源问题以及价格成本 相似文献
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E. Dourdounis G.N. Angelopoulos E. Frogoudakis D.C. Papamantellos 《Cement and Concrete Research》2004,34(6):941-947
In this paper the utilization of ferronickel electroreduction furnace (FeNi-ERF) slag for the production of high-alumina cement (HAC) is investigated through laboratory and pilot-scale tests. The process followed consisted of smelting reduction of slag mixtures with low-grade diasporic bauxite and limestone. In the laboratory-scale trials the main process parameters were defined, concerning raw material proportions, kinetics of the reductions and cooling rate of the product. The presence of a carbon-containing iron bath enhances FeOx reduction from the slag. Products from laboratory tests developed satisfactory compressive strengths relative to those of commercial HAC. According to the results of the laboratory tests, pilot-scale heat treatments were carried out in a 5-t electric arc furnace (EAF) and about 4 t of final mixture were produced. 相似文献
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超细矿渣在水泥和混凝土中的应用 总被引:4,自引:0,他引:4
1 概述 粒化高炉矿渣是冶炼行业的副产品,因其独特的冷却方式而使其玻璃体结构内含有较高的能量,有潜在的水硬性,是水泥和混凝土的优质混合材。随着我国粉磨技术向超细领域的发展,超细矿渣在水泥和混凝土中的作用愈来愈受到用户的青睐。自80年代以来,英、美、加、日、法、奥等国相继制定了国家标准,使超细矿渣的应用得到了令人瞩目的发展。但要使其潜在的活性发挥出来,必须将其粉磨到勃氏比表面积在5000~6000cm~2/g左右。当粒化高炉矿渣得到超细粉磨后,由于其玻璃体结构的 相似文献
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Nikolaos Koukouzas Charalampos Vasilatos 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2008,83(1):20-26
BACKGROUND: The aim of this work is to define the chemical and mineralogical composition of the fuel gas desulphurization (FGD) gypsum produced from the Meliti thermal power plant in the region of Florina in North West Greece, in order to investigate potential uses in the cement industry. Mineralogical and microprobe analyses were carried out on FGD gypsum samples collected from the Meliti 330 MW lignite‐fired power plant. RESULTS: Results show that the main component of the FGD gypsum is pure mineral gypsum (CaSO4·2H2O). The particle size of the gypsum ranges from 5 to 50 µm and the crystals are mainly of rhomboid shape. Microprobe analysis shows that the concentration of CaO and SO3, which are the main components, range from 31.9%–32.5% and from 45.90–46.40%, respectively. CONCLUSION: This FGD gypsum can easily substitute the natural gypsum used in the production of cement. Copyright © 2007 Society of Chemical Industry 相似文献
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磷石膏制水泥缓凝剂及建筑石膏粉的工艺特点 总被引:4,自引:1,他引:3
为解决硫酸法萃取磷酸生产的副产品磷石膏大量堆存所带来的一系列问题 ,探讨磷石膏综合利用途径 ,重点介绍铜陵化工研究院磷石膏制水泥缓凝剂 (10 0 kt/ a)及建筑石膏粉的工艺原理、流程、工艺特点、主要消耗指标及投资 ,在水泥生产企业比较集中而天然石膏馈乏的地区 ,建成水泥缓凝剂生产线是磷石膏的最佳出路 相似文献