浅析影响粉磨效果的因素

根据现有粉磨工艺状况，总结影响粉磨效果的因素。除了考虑到硅酸盐水泥熟料的组成与结构对其易磨性的影响和外加剂的使用，主要探讨粉磨工艺操作中各种参数对粉磨效果的影响。结果表明，喂料量与磨机功率，选粉效率与循环负荷等之间都有着相互影响相互制约的关系。充分的理解这些关系，有助于增加硅酸盐水泥熟料粉磨细度或提高产量。     

易磨硅酸盐水泥熟料的研究

研究了一种容易粉磨硅酸盐水泥熟料的组成、粉磨特性与物理性能。这种容易粉磨硅酸盐水泥熟料可以在假烧温度低于1400℃的条件下烧成。其矿物组成与普通硅酸盐水泥熟料相同，但具有C3S含量高(＞70％)的特点。在水泥熟料粉磨至比表面积320m^2/kg条件下，容易粉磨硅酸盐水泥熟料需要粉磨4．5min，而普通硅酸盐水泥熟料需要粉磨8min。容易粉磨硅酸盐水泥熟料的3d抗压强度可达37MPa，28d抗压强度可达60MPa。     

对矿渣粉生产和应用过程中一些问题的分析

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、     

影响水泥半终粉磨系统产量的因素

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     

分别粉磨与共同粉磨对石灰石硅酸盐水泥颗粒分布及水化性能的影响

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。     

格雷斯水泥添加剂应用技术

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…     

分别粉磨对矿渣水泥颗粒分布以及性能的影响

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。     

新型干法水泥熟料易磨性概论

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。     

新型水泥半终粉磨及终粉磨系统展望

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。     

拓宽立磨水泥颗粒级配的实践

利用不同易磨性或自身细粉含量高的混合材，在生产实践中，通过在线颗粒分析仪检测数据、对比试验，探索调节立磨水泥颗粒级配方法，以使粒径<3μm的是石灰石、窑灰、矿渣粉颗粒，3～32μm的是熟料颗粒，>30μm的为矿渣颗粒，提高熟料的利用率，解决了水泥适应性问题，拓宽了立磨水泥颗粒级配，为立磨终粉磨的使用提供借鉴。     

Superplasticized portland cement: production and compressive strength of mortars and concrete

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.     

一次P·C32.5R水泥台时产量下降的原因分析

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。     

不同助磨剂对水泥粉磨效率的影响

选取立窑和回转窑两种熟料,在同一试验条件下掺入不同混合材,在不同掺量下磨制成若干个试样,并采用细度、比表面积及粒度分布等指标来评价不同或同种助磨剂对粉磨普通水泥、矿渣水泥和火山灰水泥的效率,通过对比分析,为助磨剂的选用提供参考依据。     

Differential comminution of gypsum in cements ground in different mills

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.     

用矿渣微粉配制高掺量早强矿渣水泥的研究

通过正交试验研究不同细度、掺量的矿渣微粉和熟料对渣水泥性能的影响。试验发现,影响矿渣水泥3d、28d强度的主次因素不同,3d强度主要受矿渣细度的影响,28d强度则主要受矿渣掺量影响。采用分别粉磨后混合的生产工艺,用一定细度的矿渣微粉可以生产出掺量较高、早强性能好的矿渣水泥。     

水泥与外加剂相容性差的原因分析及解决措施

水泥与外加剂相容性的影响因素众多,如熟料矿物组成、粉磨工艺、水泥细度、混合材种类等.本文结合本公司的实际问题,分析了水泥与外加剂相容性差的原因,提出了相应的解决措施.结果表明,从改善熟料矿物组成和提高熟料烧成质量入手,可改善水泥与外加剂的相容性,效果显著.     

Investigation of the effects of fatty acids on the compressive strength of the concrete and the grindability of the cement

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.     

助磨介质作用下旋窑熟料微细化过程及其效果评价

通过对助磨介质作用下不同粉磨细度的旋窑熟料所配制的硅酸盐水泥的物理性能检测,对助磨介质作用下旋窑熟料的微细化效果进行了评价。结果表明,对水泥熟料来说,早期的快速水化不一定能得到高强度的水泥,因此熟料微细化的评价要从水化性能和粉磨能耗上综合考虑,在实验中,旋窑熟料的最佳粉磨细度为5 000m2/g,而加入助磨剂可显著降低粉磨能耗,在达到同样效果时缩短25％的粉磨时间。     

Examination of the jarosite-alunite precipitate addition in the raw meal for the production of portland cement clinker

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.