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将铝灰除尘灰和废酸中和预处理后通过水泥窑协同处置固态系统处置,以实际工业试验验证了除尘灰和废酸入窑对水泥窑工况及熟料质量的影响。结果表明:除尘灰氯、碱以及氧化铝是影响熟料质量的主要因素,将除尘灰与废酸以1.5∶1的比例中和处理后,性状可满足固态系统要求,且有效地缓解了有害成分对水泥窑工况的影响。对于4 500 t/d水泥窑生产线,中和入窑后最高处置量为4 t/h,而除尘灰入窑量控制在2.4 t/h以下,熟料质量可保持稳定合格,且有助于提升熟料28 d抗压强度,最高增加2.2 MPa。 相似文献
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针对水泥窑协同处置液态危废对水泥熟料生产的影响,文章从烧成系统、煤耗、熟料产量及质量和大气污染物排放四个方面研究分析。研究结果表明窑头废液处置期间:喂料量基本保持不变;会使二次风温波动幅度增加10 ℃左右;总煤用量基本没有明显波动;熟料产量均在5 000 t/d以上,28 d抗压强度维持在55.2~55.6 MPa;颗粒物含量在2.65~2.78 mg/m3,NOx含量在82.13~85.71 mg/m3,SO2含量在11.21~16.73 mg/m3,HCl含量在0.05~0.13 mg/m3,均满足标准要求。 相似文献
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预分解窑共处置废弃物是减轻全社会环境负荷的必然选择,但必须在不影响水泥质量的前提下进行。为了探讨预分解窑共处置废弃物对水泥质量的影响,随机抽取了4家水泥企业规格等级为42.5R的水泥样品进行检测,抗压强度检测6次,取平均值,水泥窑处置废弃物所产水泥3 d抗压强度为31.6 MPa,28 d抗压强度为55.0 MPa;抗折强度检测3次,取平均值,水泥窑处置废弃物所产水泥3 d抗折强度为6.0 MPa,28 d抗折强度为8.7 MPa;水泥窑处置废弃物所产水泥强度指标位于4个水泥厂样品中第二位,得出了预分解窑共处置废弃物对水泥产品质量没有影响的结果。 相似文献
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结合水泥窑运行及水泥质量分析,研究了钨渣替代部分钙质原料处置后对水泥熟料磷含量、碱含量、凝结时间及强度的影响。结果表明:控制掺加比例在5%以内,虽一定程度上延迟了水泥的凝结,但对3 d及28 d强度有较大的正向贡献,同时减少了碳排放。 相似文献
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以水淬镍渣为原料,经机械球磨、筛分、陈化等工艺对镍渣进行预处理;将预处理后的镍渣加入到硅酸盐水泥熟料中,经二次球磨后制备镍渣水泥,研究了镍渣的掺量对水泥基本性能的影响.结果表明:镍渣掺量对水硅酸盐水泥的物理力学性能有重要影响.当将预处理后的镍渣以0%~20%等量取代水泥熟料时,水泥的标准稠度用水量下降,凝结时间增长,体积安定性良好,强度有所降低,但主要指标均满足水泥基本性能的要求.当镍渣掺量为20%时,制备的水泥胶砂试块3d和28 d抗压强度分别为23.6 MPa和40.2 MPa,抗折强度分别为5.2 MPa和8.6 MPa. 相似文献
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Paul J Tikalsky Della RoyBarry Scheetz Tara Krize 《Cement and Concrete Research》2002,32(8):1239-1246
Experimental research was performed to relate specific cement characteristics to expansion due to sulfate attack. Twenty-one North American cement of statistically diverse chemical composition were used in the study. ASTM 1012 “Standard Test Method for Length Change of Hydraulic Cement Mortars Exposed to a Sulfate Solution” was performed using mortars prepared with each of the cement. First-order and multivariate relationships between cement characteristics and sulfate expansion were correlated at different ages. Analysis revealed that while tricalcium aluminate (C3A) has typically been targeted as the chief contributor to sulfate attack, iron oxide (Fe2O3) or tetracalcium aluminoferrite (C4AF) content, combined with total equivalent alkalis, showed a much stronger negative correlation with expansions at all ages. These results are in agreement with a broad spectrum of sulfate expansion theories and can provide a better means of specifying sulfate-resistant cement. 相似文献
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基于硫铝酸盐水泥、硅酸盐水泥各自的特点,研究了二者复配后的标准稠度用水量、凝结时间、水化热效应、胶砂强度、膨胀性、水化产物的物相及微观形貌。结果表明,复配水泥的标准稠度用水量因复配比例不同而变化,凝结时间相对于占主导地位的单组分水泥明显缩短;复配水泥的早期水化速率得到提高,1d、7d的水化放热量均低于占主导地位的单组分水泥;28d抗压、抗折强度低于任何单组分水泥;膨胀性的大小取决于两种水泥的复配比例;硫铝酸盐水泥与硅酸盐水泥的复配使二者的水化相互促进,随着硫铝酸盐水泥掺量的增加,Ca(OH)2相的衍射峰减弱,AFt相的衍射峰增强;纯硅酸盐水泥水化后的微观形貌是致密的,而与硫铝酸盐水泥复配后则出现微观裂纹。 相似文献
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我国水泥标准与国际接轨对水泥工艺技术的影响 总被引:3,自引:1,他引:3
人类的发展必然有竞争,而标准则是竞争的规范。在发展过程中为了提高水平而修订标准当为必需─—作者1修订现行水泥标准的目的1.1提高水泥的实物强度我国现行有关硅酸盐水泥系列国家标准约39项。当前打算陆续修订的有《GB177-85水泥胶砂强度检验方法》、《GB178—77水泥强度 相似文献
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通过将木质素磺酸钙、乙二醇和二甲基甲酰胺(DMF)三种助磨剂按一定比例混合,采用三因素三水平的正交试验,系统研究了复合助磨剂对水泥性能和水泥颗粒分布的影响。当复合助磨剂加入后,可有效地提高水泥的助磨效果,降低水泥标准稠度用水量,增强水泥胶砂强度,提高3μm~30μm之间颗粒的含量,改善了水泥的性能。 相似文献
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预分解窑与湿法窑的工艺差异,其熟料的微观结构能够明显反映;熟料的晶体结构取决于工艺过程,并能判断操作水平的高低;从分解炉结渣的微观结构可以准确地找出原燃材料存在的问题。也就是说,水泥生产过程中的不良环节均能从熟料岩相结构中反映出来。 相似文献
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阿利特—硫铝酸盐水泥与硅酸盐水泥复合性能的研究 总被引:11,自引:1,他引:10
研究了阿利特-硫铝酸盐水泥与硅酸盐水泥复合所制备的水泥的性能。结果表明,复合后水泥的强度性能优于单一品种水泥的性能;凝结时间则由复合体中占比例较多的一种水泥所控制。 相似文献
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The influence of styrene-butadiene rubber (SBR) latex on cement hydrates Ca(OH)2, ettringite, C4AH13 and C-S-H gel and the degree of cement hydration is studied by means of several measure methods. The results of DSC and XRD show that the Ca(OH)2 content in wet-cured SBR-modified cement pastes increases with polymer-cement ratio (P/C) and reaches a maximum when P/C is 5%, 10% and 10% for the pastes hydrated for 3 d, 7 d and 28 d, respectively. With wet cure, appropriate addition of SBR promotes the hydration of cement, while the effect of SBR on the content of Ca(OH)2 and the degree of cement hydration is not remarkable in mixed-cured SBR-modified cement pastes. XRD results illustrate that SBR accelerates the reaction of calcium aluminate with gypsum, and thus enhances the formation and stability of the ettringite and inhibits the formation of C4AH13. The structure of aluminum-oxide and silicon-oxide polyhedron is characterized by 27Al and 29Si solid state NMR spectrum method, which shows that tetrahedron and octahedron are the main forms of aluminum-oxide polyhedrons in SBR-modified cement pastes. There are only [SiO4]4− tetrahedron monomer and dimer in the modified pastes hydrated for 3 d, but there appears three-tetrahedron polymer in the modified pastes hydrated for 28 d. The effect of low SBR dosage on the structure of aluminum-oxide and silicon-oxide polyhedron is slight. However, the combination of Al3+ with [SiO4]4− is restrained when P/C is above 15%, and the structure of Al3+ is changed obviously. Meantime, the polymerization of the [SiO4]4− tetrahedron in C-S-H gel is controlled. 相似文献
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Investigations on bulk cement paste specimens made from different cements confirm the occurrence of hollow-shell or “Hadley grains”, similar to those previously established as occurring near interfaces with glass slides. The existence of such grains in previous microstructural investigations of cement pastes has apparently been overlooked. Since few grains in bulk cement pastes fracture to reveal details of their interiors, the relative frequency of occurrence of hollow-shell grains and grains showing inner hydration product in contact with the exterior shell can not be assessed unambiguously, but almost all fractured grains observed seem to be of the hollow-shell variety. 相似文献
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在水泥交货贸易计量中,一般袋装水泥按每包50kg的点数计量作为水泥出厂计量或建筑施工现场水泥交货的计量验收。散装水泥出厂的计量一般须在汽车衡上对散装专用汽车进行三次称重计量,即第一次为散装水泥装车前的空载计量,第二次为散装水泥装入车内后的载重计量,第三次为散装水泥在用户处卸完货后的空载计量,并根据三次计量称重结果,计算出实际的散装水泥交货贸易数量,其计量十分繁锁。而散装水泥在建筑施工现场交货的计量验收一直没有更好办法,由于散装水泥的三次计量行为均在水泥生产或中转企业内完成,用户无法看到或验证其送到现场的散装… 相似文献
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以铝酸盐水泥熟料、硅酸盐水泥熟料和粉煤灰为原料,探讨了掺加少量铝酸盐水泥熟料对硅酸盐水泥及粉煤灰硅酸盐水泥复合体系水化、凝结和硬化性能的影响。结果表明,在硅酸盐水泥及粉煤灰硅酸盐水泥中掺加铝酸盐水泥熟料,可以明显缩短水泥的初、终凝时间,但复合体系的需水量增加;掺加少量铝酸盐水泥熟料(≤3%)可明显提高硅酸盐水泥的早期强度,但后期强度(28d)有所降低;当铝酸盐水泥熟料的掺量达5%时,水泥的各龄期强度均明显降低。少量铝酸盐水泥熟料掺加到粉煤灰硅酸盐水泥中,复合体系的各龄期强度都明显提高,且早期强度的提高幅度较大。 相似文献