利用污水厂污泥配料煅烧水泥熟料研究

通过生料易烧性试验、水泥熟料矿物岩相分析、XRD、SEM、水泥胶砂强度试验等，对利用污水厂污泥代替部分粘土配料煅烧硅酸盐水泥熟料的过程，并对制备熟料的微观特征进行了研究。结果表明：污水厂污泥代替部分粘土烧制的水泥熟料，其矿物结构与常规的硅酸盐水泥熟料完全相同，且由污泥配料煅烧的熟料烧成温度有降低的趋势；其水泥水化和凝结、硬化过程与常规硅酸盐水泥完全相同；其水化产物结构与常规硅酸盐水泥完全相同；水泥胶砂强度达到50．0MPa。     

硅酸盐水泥熟料的率值匹配模型

在传统的水泥熟料三率值KH、SM和IM基础上提出饱硅系数KS的概念,通过分析52组硅酸盐水泥实际生产相关数据,建立硅酸盐水泥熟料率值匹配模型。并利用该模型对高性能水泥熟料率值进行了初步探讨。     

以Co_2O_3作着色剂制备彩色水泥的研究

在研究彩色水泥的制备中发现用Co2O3作着色剂时,制备的彩色水泥熟料的颜色与文献及书籍中所提到的有所不同。本研究是在着色剂掺量相同的条件下,分别在正常条件或还原条件下煅烧,所制备的硅酸盐彩色水泥熟料,随着着色剂掺量增加由土黄色向青黑色转变。而在着色剂掺量、煅烧条件相同的情况下所得的高铝水泥熟料为蓝色。     

硅酸盐水泥熟料的率值匹配模型

在传统的水泥熟料三率值KH、SM和IM基础上提出饱硅系数Ks的概念，通过分析52组硅酸盐水泥实际生产相关数据，建立硅酸盐水泥熟料率值匹配模型。并利用该模型对高性能水泥熟料率值进行了初步探讨。     

钢渣彩色水泥熟料低温烧成及其性能研究

水泥窑中直接烧成的彩色熟料水泥具有成本低、色泽鲜艳、色彩稳定性好等特点.本文着重探讨了在能源紧张情况下,利用氟、硫复合矿化剂低温烧成钢渣彩色水泥熟料的可能性.通过 X 射线衍射、扫描电镜观察和红外光谱等近代测试分析技术及化学分析、常规物理力学试验方法对用水泥工业性优质原料配料和掺电炉还原钢渣配料高低温烧成彩色熟料的矿物组成、色彩情况、物理力学性能及其特性进行了分析研究.     

废弃混凝土再生水泥熟料的配制与性能

以完全不用天然石灰石、粘土、页岩和砂岩,废弃混凝土在生料中的质量百分含量高达95％～99％和普通煅烧工艺制备出了水泥熟料(以下简称再生熟料).将再生熟料与用天然石灰石和砂岩制备的水泥熟料进行了对比试验与分析,结果表明:2种熟料具有完全相同的XRD特征峰位,再生熟料的熟料矿物形成正常;2种熟料化学成分相近,再生熟料的率值设计中更倾向于高钙低硅;再生熟料的f-CaO含量满足安定性要求;再生熟料制备的水泥的3d强度达到42.5级硅酸盐水泥的要求,28 d强度达到52.5级硅酸盐水泥的要求.     

利用水泥窑处理污水厂污泥实验研究

利用吉林亚泰集团鼎鹿水泥公司3#水泥窑对污水处理厂污泥进行处理,对掺加不同比例污泥生产的水泥熟料进行分析,研究污泥对水泥熟料化学成分和性能的影响。实验结果表明,掺加污泥后生产的水泥熟料各项指标均满足国家标准《硅酸盐水泥、普通硅酸盐水泥》(GB175-2007)要求,水泥窑尾烟气污染物浓度满足《水泥工业大气污染物排放标准》要求。     

硅酸盐水泥熟料对硫铝酸盐水泥某些性能影响的研究

本文利用硫铝酸盐水泥熟料、二水石膏、硅酸盐水泥熟料配制了三组份硫铝酸盐水泥,研究了硅酸盐水泥熟料对硫铝酸盐水泥某些性能的影响。试验结果表明,掺入适量的硅酸盐水泥熟料,对硫铝酸盐水泥某些性能有明显影响:一、提高水泥早期的抗压强度;二、可以改变水泥的热稳定性;三、调整硅酸盐水泥熟料和石膏的加入量,可以调整水泥的凝结时间和自由膨胀率。作者利用X射线衍射分析、差热分析、电子显微镜观察、压汞测孔仪、热膨胀仪及光电比色计等方法和手段,研究了提高强度和热稳定性的原因。结果表明,加入硅酸盐水泥熟料后,减小了钙矾石结晶尺寸,降低了水泥石的孔隙率、增加了结构的密实度。作者根据实验结果,进一步讨论了减小钙矾石结晶尺寸、增加结构密实度的原因。加入硅酸盐水泥熟料后,提高了水化液相的碱度,使得钙矾石结晶尺寸减小。关于水泥石结构的密实度,主要从水泥浆体的凝聚结构方面进行了讨论。在实验条件下,测得钙矾石的表面电性为正、水化硅酸钙的表面电性为负。由于电性相反,范德华引力与电性引力一致,增加了形成凝聚结构的力,致使形成较为致密的凝聚结构。测定水泥浆悬浮体的透光率的结果进一步证实了此结论,未加硅酸盐水泥熟料的水泥悬浮体透光率小,而加后的透光率大。在此基础上,作者提出了在凝聚结构形成过程中,应创造条件使之产生相互匹配的异性水化物的看法。水泥热稳定性增加,作者认为与钙矾石的尺寸减小和均匀分布有密切关系。钙矾石结晶尺寸大而集中时,加热水泥石,开始受热膨胀,到达钙矾石脱水温度后,继而急剧收缩,造成较大的局部应力,破坏水泥石结构。测定水泥石热膨胀系数表明,未加硅酸盐水泥熟料的热膨胀系数大,而加后热膨胀系数减小。     

铜尾矿替代粘土煅烧硅酸盐水泥熟料的研究

以铜尾矿、石灰石、铁矿石为原料,进行水泥生料配方优化试验,开展煅烧硅酸盐水泥熟料研究,f-CaO测定、XRD矿物分析为手段确定水泥熟料煅烧的配比参数.实验结果表明,以铜尾矿替代粘土,辅以钙质、铁质及铝质校正原料,采用0.88的石灰饱和系数,2.4的硅率,1.530的铝率可制备出水化活性较高的硅酸盐水泥熟料,为铜尾矿的处理利用寻找到一条很好的出路.     

含高硫复合矿化剂的硅酸盐水泥熟料形成过程的研究

作者模拟水泥熟料煅烧升温过程,利用高温X射线衍射及常规X射线衍射等分析手段,研究了含高硫复合矿化剂硅酸盐水泥熟料的煅烧过程。分析结果表明:CaF_2及高含量CaSO_4对硅酸盐水泥熟料煅烧起明显矿化剂作用,使熟料在煅烧过程中出现三种中间过渡相,并促使物料在1100℃出现适量液相和析出阿利特晶相。本文还分析了熟料煅烧中C_(11)A_7·CaF_2和C_4A_3S晶相形成规律。     

CORRELATION OF THE COMPONENTS OF PORTLAND CEMENT CLINKER AND SINTERING PROCESS BY MEANS OF XRD QUANTITATIVE ANALYSIS

In this paper,the cement clinkers fromvarious industrial kilns were investigated by a superposingpeaks method for X-ray quantitative analysis(XRQA)ofclinker minerals,the results show that the clinker mineralcontents measured by XRQA method better accord with thereality of clinkers made in different conditions than theo-retic contents calculated by Bouge formula do.The mea-sured contents of C_3S of clinkers manufactured in rotarykilns are higher than theoretically calculated values,where-as,the results of clinker manufactured in shaft kilns arecontrary to that.This is because in rotary kiln,the rawmeals are fully pre-heated and have high sintering temper-ature,the clinkers are well solid-solutioned and rapidlycooled,on the contrary,owing to the struetural defects,it iseasy to exist reduing atmosphere and lower temperature inshaft kiln,moreover the cooling rate is slower,all these canevidently lead to worse clinker quality.Adding CaF_2-Ca-SO_4 complex mineralizer can remarkably modify the sinter-ing situat     

电厂煤粉炉联产水泥熟料技术试验研究

以低硫兖州煤和高硫长广煤为试验煤种,在两段多相试验台开展了煤粉炉联产水泥熟料技术试验研究.试验结果表明:低硫兖州煤和高硫长广煤联产水泥熟料试验样品的固硫率均在50%左右,高于煤粉炉仅为30%的炉内喷钙脱硫效率,样品熟料矿物与普通水泥熟料矿物组成相似、性能相近.通过对样品熟料矿物的特征分析,提出了开展电厂煤粉炉联产水泥熟料技术研究的重点.     

Influence of sugar filter mud on formation of portland cement clinker

To explore the mechanisms of filter mud (FM) in the portland cement clinker formation, and to make effective use of FM in the cement production as lime-based raw materials, the influences of FM on the apparent activation energy of calcium carbonate decomposition, liquid phase amount, crystalline phase and tricalcium silicate polymorphism were investigated by TA, SEM and XRD. The experimental results show that FM can reduce apparent activation energy of calcium carbonate decomposition, and increase liquid phase amount. Appropriate FM replacement ratios are useful to promoting the C₃S formation and heightening the C₃S content. New phases of α-C₂S and C₂S·0.5Ca₃ (PO₄)₂ can be found in the clinkers while the ratios are above 15%. In addition, impurities in FM can induce the C₃S polymorph to transform.     

硅酸盐水泥熟料的光学显微结构特征的研究

利用反光显微镜观察了不同煅烧制度下硅酸盐水泥熟料的显微结构特征，讨论煅烧温度和时间对水泥熟料显微结构的影响，运用此方法可初步了解生产过程中出现的种种问题，为指导水泥熟料的生产和质量监控提供可靠依据。     

EFFECT OF Mg ON FLUORIDE-BEARING AND SULPHUR-BEARING CEMENT BURNING

The effect of MgO on the burning processes ofclinker with SO_3 or SO_3+CaF_2 combined mineralizerare studied. It shows that exsistance of MgO isfavourable to burning processes of the clinker andcan accelerate the formation of C_3S as well as hasa supplementary action together with the combinedmineralizer. The content of MgO in the clinker isworked out about 3%. Besides, the distribution ofMgO in the clinker is also studied by which theaccelerating action of MgO on the formation of theclinker are interpreted.     

水泥熟料配方及煅烧工艺探讨

选择易烧性较好的原燃料，适当提高水泥熟料中的n值，降低KH值，增加有效硅酸盐矿物成份（C3S＋C2S）的总量，从而提高了熟料的实物质量。     

A New Kind of Eco-Cement Made of Cement Kiln Dust and Granular Blast Furnace Slag

1 IntroductionThe kiln dust is the solid waste collected fromce-ment kilns .Its chemical composition is similar to that ofcement raw meal , but the potassuim,sodium, chlorineand sulfur content and the lime saturation coefficient aremuch higherthanthose of the cement rawmeal[1].Ontheother hand,the binding water of it is relatively lowandthere are some clinker minerals . Generally,cement kilndust can be classifiedintotwo categories .One isthe dustfromdry process rotary kilns (without preheater …     

Effect of barium oxide on the formation and coexistence of tricalcium silicate and calcium sulphoaluminate

Formation and coexistence of tricalcium silicate (C₃S) and calcium sulphoaluminate (C₄A₃ ) minerals in Portland cement clinker containing calcium sulphoaluminate were investigated. The f-CaO content, mineral composite and formation of mineral in the clinker were analyzed respectively by chemical analysis, differential scanning calorimetry(DSC) and X-ray diffraction. The results show that, adding a suitable amount of BaO can improve the burnability of raw meal and promote the f-CaO absorption. Tricalcium silicate and calcium sulphoaluminate minerals can form and coexist in clinkers at 1 234–1 317 °C by the addition of BaO to the raw meal. A suitable amount of BaO expanded the coexistence temperature of two minerals by 58 °. Funded by the National Basic Research Program of China (No. 2009CB623100), National Eleven Five-Year Scientific and Technical Support Plans (No. 2006BAF02A24), the Natural Science Fund for Colleges and Universities in Jiangsu Province(No. 08KJB430006), the Open Fund for the Key Laboratory of Inorganical and Composite Materials in Jiangsu Province(No. wjjqfhxc1200801) and the Innovation Fund of Doctoral Dissertation of Nanjing University of Technology (No. BSCX200705)