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水泥熟料和矿渣分别粉磨再混合制成水泥的工艺,可以解决传统的混合粉磨工艺中水泥熟料和矿渣的易磨性与水化速度的矛盾,是"从新的粉磨技术中获得水泥性能"的重要实践,因此,国内钢铁和水泥生产企业建设了大量矿渣粉的立磨或球磨生产线[1],国家也颁布了矿渣粉的产品标准。矿渣粉不仅可以在水泥厂与P.I型硅酸盐水泥混合制成普通硅酸盐水泥、 相似文献
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浩良河水泥有限责任公司水泥半终粉磨系统从1996年3月开始带料调试,仅用不到3个月的时间就达到了设计产量,并实现了安全运转。本人就对影响半终粉磨系统产量的几点因素作简要分析。1物料的影响1.1物料的易磨性物料被粉磨的难易程度用易磨性来表示,作为半终粉磨的主要物料——熟料,其易磨性随组成的不同而差别较大,熟料中Al2O3、C3S增加,则易磨性较好;而熟料中SM、C2S增加,则易磨性较差。而且水泥熟料的易磨性还与煅烧情况有关,如过烧或黄 相似文献
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试验采用分别粉磨工艺和共同粉磨工艺配制石灰石硅酸盐水泥,分析了石灰石和熟料的粉磨特性差异,并研究了在单位能耗相同情况下,两种粉磨制度下石灰石硅酸盐水泥各组份颗粒分布及水化情况。结果表明,分别粉磨制度能合理控制石灰石硅酸盐水泥颗粒的分布,使熟料处于更细的颗粒范围内,提高了粉磨效率;细的石灰石粉能促进水泥的早期水化反应,而中后期的水化速率主要取决于熟料颗粒的细度;采用合理的分别磨粉工艺配制的石灰石硅酸盐水泥,在相同龄期下,其水化产物含量较多,水化产物之间的连结更紧密,水泥石整体结构更密实。 相似文献
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1水泥添加剂的作用机理水泥粉磨过程中,添加一定量的水泥添加剂,能有效地增加水泥颗粒表面,减少水泥颗粒之间的聚集现象,减少水泥磨内的糊球现象;同时提高磨机系统的选粉效率,减少磨内的物料量,缩短水泥在磨内的停留时间(MRT)和降低磨机填充率。1.1易磨性我们先谈谈水泥的易磨性。水泥的易磨性可通过实验室的小磨得到。影响水泥的易磨性的主要因素有:C2S含量,熟料矿物的晶体结构,熟料的致密性和SO3含量。另外石膏和混合材也对水泥的易磨性有一定的影响。不同的熟料,其易磨性可相差50%以上。图1是水泥吨电耗和水泥… 相似文献
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本文从矿渣和熟料的易磨性和粉磨动力学方面,解释了共同粉磨和分别粉磨的矿渣水泥颗粒分布产生差异的原因,总结并分析了两种不同工艺对矿渣水泥和混凝土性能的影响。 相似文献
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基于国外的研究论点,对新型干法水泥熟料及配料进行试验实测对比。结果表明:熟料热工形成过程影响易磨性的主要因素是C2S含量,其他矿相、液相含量以及密度/升重的影响不明显;快冷熟料优于慢冷;水泥粉磨过程的影响取决于熟料及其配料原料的易磨性,挤压终粉磨、联合粉磨等工艺可以忽略所有影响易磨性的因素,易磨性试验可节能30%~60%以上。 相似文献
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本文对辊压机\Beta磨水泥半终粉磨和CKP磨\Horomill水泥终粉磨系统作细化分析,根据各类料床粉碎设备和相应工艺流程配套选粉机的结构特点,从产量、电耗、需水性、强度、建设成本、易操作、可维护性等各方面作比较,提出相应选用原则,认为采用合理的工艺系统,在粉磨中等易磨性熟料正常配料的P·O42.5水泥时可达到25 kWh/t电耗。 相似文献
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This paper deals with the effect of intergrinding different percentages of a naphthalene-based superplasticizer with Portland cement clinker and gypsum on the fineness of the product, and on the water requirement and the compressive strength of the mortars made with the superplasticized cement. The properties of the fresh and hardened concrete made with the superplasticized cements were also investigated. The results showed that the intergrinding of a given amount of a naphthalene-based superplasticizer with Portland clinker and gypsum reduced the grinding time required for obtaining the same Blaine fineness as that of the control Portland cement without the superplasticizer. The water requirement of the mortars made with the superplasticized cements was similar to that of the mortars made with the control Portland cements when the same amount of the superplasticizer was added at the mortar mixer; for a given grinding time and a Blaine fineness of 4500 cm2/g, the mortars made with the superplasticized cement had higher compressive strength than those made with the control Portland cement. For a given grinding time or Blaine fineness of cement ≥5000 cm2/g, the slump loss, air content stability, bleeding, autogenous temperature rise, setting times, and compressive strength of the concrete made with the superplasticized cements were generally comparable to those of the concrete made with the control Portland cements when the superplasticizer was added at the concrete mixer. 相似文献
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针对我公司500000t/d熟料水泥生产线生产P·C32.5R水泥时磨台时产量大幅下降的问题,对其原因进行分析,主要原因是粉煤灰细度的变粗,另外,熟料易磨性的变差和中控操作上应对磨内工况变差和选粉机选粉效率下降的措施不合适也是造成此次问题的原因。解决措施为在粉煤灰细度不变的情况下,适当降低比表面积控制指标,降低工序电耗,也能保证水泥抗压强度相对稳定。 相似文献
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Identical mixes containing fixed amounts of ordinary Portland cement clinker and gypsum were ground in two types of industrial cement mills—viz. ball mill (BM) and vertical roller mill (VRM)—to identical Blaine fineness to examine the effect of any possible differential comminution of gypsum on cement setting times. The present investigation demonstrates that during comminution of cements, the degree of crystallinity of gypsum, as determined by X-ray diffraction (XRD), changes with used grinding mills and this causes changes in setting times of similar cements even when ground to identical Blaine fineness. 相似文献
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Investigation of the effects of fatty acids on the compressive strength of the concrete and the grindability of the cement 总被引:1,自引:0,他引:1
In cement industry, a great energy consumption has been observed during grinding of clinker. To reduce this consumption, some waste products have been used as grinding aids.In this investigation, the effects of sunflower oil (SO), oleic acid (OA), stearic acid (SA), myristic acid (MA) and lauric acid (LA) on the fineness and strength of the cement have been examined. These aids were added into clinker in certain ratios based on the cement clinker weight and the grinding has been done for a definite time at the same condition.All of the fatty acids used increased the fineness as compared with the cement without the grinding additives. SO and OA decreased the strength significantly, LA decreased it to a lesser extent and SA increased it definitely according to the common cement. But MA did not alter the strength of the cement as much as SA. In addition, the covering of the balls influences the grinding of cement clinker unfavourably. 相似文献
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P.E. Tsakiridis S. Agatzini-Leonardou M. Katsioti 《Cement and Concrete Research》2005,35(11):2066-2073
The aim of the present research work was to investigate the possibility of adding a jarosite-alunite chemical precipitate, a waste product of a new hydrometallurgical process developed to treat economically low grade nickel oxides ores, in the raw meal for the production of Portland cement clinker. For that reason, two samples of raw meals were prepared, one with ordinary raw materials, as a reference sample ((PC)Ref) and another with 1% jarosite-alunite precipitate ((PC)J/A). Both raw meals were sintered at 1450 °C. The results of chemical and mineralogical analyses as well as the microscopic examination showed that the use of the jarosite-alunite precipitate did not affect the mineralogical characteristics of the so produced Portland cement clinker. Furthermore, both clinkers were tested by determining the grindability, setting time, compressive strength and expansibility. The hydration products were examined by XRD analysis at 2, 7, 28 and 90 days. The results of the physico-mechanical tests showed that the addition of jarosite-alunite precipitate did not negatively affect the quality of the produced cement. 相似文献