煤矸石代黏土煅烧水泥熟料配方优化试验研究

为获得煤矸石代黏土配料应用于水泥生产的煅烧热工条件和合理配方,选取不同煤矸石和不同品位的石灰石等原料配制6种水泥生料,在实验室熟料煅烧试验台上进行不同温度下煅烧水泥熟料的试验研究,对试验所得的熟料样品分别进行游离CaO质量分数的测定和矿物组成的X射线衍射(XRD)分析.试验结果表明:煤矸石代黏土与中钙石灰石和高中钙石灰石配料,都能烧制出合格的水泥熟料,烧成温度比黏土配料的烧成温度降低50℃以上;而煤矸石与高钙石灰石的配方则在烧成温度上没有明显优势,说明煤矸石与中钙石灰石或高中钙石灰石配料能烧制出高质量的水泥熟料.     

煤矸石代黏土煅烧水泥熟料配方优化试验研究

为获得煤矸石代黏土配料应用于水泥生产的煅烧热工条件和合理配方,选取不同煤矸石和不同品位的石灰石等原料配制6种水泥生料,在实验室熟料煅烧试验台中进行不同温度下煅烧水泥熟料的试验研究,对试验所得的熟料样品分别进行了游离CaO质量分数的测定和矿物组成的X射线衍射（XRD）分析.试验结果表明：煤矸石代黏土与中钙石灰石和高中钙石灰石配料,都能烧制出合格的水泥熟料,烧成温度比黏土配料的烧成温度降低50 ℃以上;而煤矸石与高钙石灰石的配方则在烧成温度上没有明显优势,说明煤矸石与中钙石灰石或高中钙石灰石配料更能烧制出高质量的水泥熟料.     

金属尾矿代黏土配料煅烧水泥熟料试验研究

为获取金属尾矿代黏土配料用于水泥熟料生产的工艺参数以及分析金属尾矿对不同品位石灰石的适应性，选取6种金属尾矿，在实验室高温炉不同温度下进行尾矿代黏土配中、高钙石灰石煅烧水泥熟料的试验研究.对试验所得熟料样品分别进行了游离氧化钙质量分数的测定和矿物组成X射线衍射（XRD）分析.试验结果表明，金属尾矿代黏土与中钙、高钙石灰石配料均能烧制出合格熟料；熟料的烧成温度较黏土配料1 450 ℃的烧成温度降低了100～150 ℃；当金属尾矿配中钙石灰石时在1 300 ℃即可完成熟料烧成，与金属尾矿配高钙石灰石时1 350 ℃的煅烧温度相比，金属尾矿配中钙石灰石更适合水泥熟料烧成.     

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。     

尾矿作水泥矿化剂和铁质原料的试验研究

为开发利用大量堆弃危害环境的金属尾矿固体废弃物,根据其富含多种微量元素,（Fe2O3质量分数较高）,且熔点较低的特点,将其作为矿化剂和铁质原料生产水泥开展试验研究.用铜尾矿按质量比为5％的掺量配制水泥生料,在实验室高温炉不同温度条件下进行水泥熟料煅烧试验.对熟料样品的f-CaO、化学成分和X衍射矿物成分分析表明,在1 300℃煅烧温度下,f-CaO质量分数低于1％,C3S质量分数达56.79％,熟料矿物组成与不加尾矿的传统配料水泥熟料基本相同,而烧成温度比传统配料降低了100～150 ℃.金属尾矿用作水泥矿化剂和铁质原料烧制水泥熟料,能降低水泥熟料烧成能耗,减少水泥生产成本,提高熟料产量和质量,实现尾矿的资源综合利用,并能有效地保护环境.     

以电炉还原渣重构转炉钢渣的组成与性能

掺加电炉还原渣重构转炉钢渣的组成和结构制备了高胶凝活性的钢渣。采用化学全分析、XRD、SEM等手段分析了钢渣重构前后的组成、水化产物形貌,并进行了力学性能试验。结果表明:重构钢渣矿物组成以活性硅酸二钙、硅酸三钙和七铝酸十二钙等胶凝矿物为主。当电炉还原渣掺量分别为10%和20%、煅烧温度分别为1 350℃和1 250℃时,重构钢渣水泥的活性指数分别为102.9%和104.0%。掺重构钢渣水泥28 d龄期水化产物与普通硅酸盐水泥的相似,但浆体结构更为致密。     

低热水泥熟料岩相观察及配料煅烧分析

通过对低热水泥熟料岩相结构观察,分析了低热水泥熟料岩相结构特征;介绍了低热水泥的配料率值,即低KH、p值和高n值;分析了熟料煅烧环节参数的调整,需要减少喂料量,减少分解炉用煤比例,提高回转窑用煤比例,降低分解炉出口温度,为了适应高n值配料和生产高活性C2S,回转窑内应保持高温煅烧.煅烧低热水泥熟料的热耗比煅烧普通水泥热...     

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.     

稀土尾矿对水泥熟料性能的影响

试验选用云南楚雄州某地稀土尾矿,以稀土尾矿部分取代黏土原料进行水泥熟料煅烧试验。试验结果表明:掺入稀土尾矿及铅锌矿烧成熟料中的f-CaO含量明显减少,生料的易烧性提高;其3 d、7 d和28 d抗压强度均有不同程度的提高;水泥熟料中的C3S、C3A和C4AF含量有所增加,对水泥熟料的烧成起到促进作用,有利于水泥熟料矿物的形成,尤其是熟料中的C3S增加明显。     

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.     

Early hydration of composite cement with thermal activated coal gangue

Composite cement samples were prepared by mixing clinker, gypsum with burnt coal gangues which was calcined at various temperatures. The mechanical strength and Ca(OH)₂ content in the cement paste were tested, and the paste composition and microstructure were analyzed by thermogravimetry-differential thermal analysis (TG-DSC), X-ray diffraction(XRD), scanning electronic microscopy (SEM) and pore structure analysis. Results demonstrate that the thermal activated coal gangue could accelerate the early hydration of cement clinker obviously, which promotes the gangue hydration itself. The early hydrated products of the cement are C-S-H gel, Ca(OH)₂ and AFt. The cement with 30% (in mass) the gangue exhibits higher mechanical strength, and among all the cement samples the one with the gangue burnt at 700 °C displays the highest hydration rate, mechanical strength, the most gel pores and the lowest total porosity.     

Utilization of coal gangue and copper tailings as clay for cement clinker calcinations

In order to avoid environmental pollution from Coal gangue (CG) and copper tailings (CT), the utilization as cement clinker calcinations was experimentally investigated. Low-calcium limestone was also selected as another raw material. The clinker component and microstructure were analyzed by XRD and SEM. The experimental results showed that qualified cement clinker could be generated by substituting CG and CT compound for clay. While mixed with high-calcium limestone and low-calcium limestone, the calcinations temperature were 50 °C or 100 °C lower than that of clay. CT and CG contain oxygen-rich minerals and potential of geological rock energy. The energy of CG performs functions and drops down sintering temperature. The calcination time was shortened and the clinker sintering coal consumption reduced while substituting CG and CT for clay, and also served the reutilization of low-calcium limestone, CG and CT.     

Early Hydration of Composite Cement with Thermal Activated Coal Gangue

Composite cement samples were prepared by mixing clinker, gypsum with burnt coal gangues which was calcined at various temperatures. The mechanical strength and Ca(OH)2 content in the cement paste were tested, and the paste composition and microstructure were analyzed by thermogravimetry-differential thermal analysis (TG-DSC), X-ray diffraction(XRD), scanning electronic microscopy (SEM) and pore structure analysis. Results demonstrate that the thermal activated coal gangue could accelerate the early hydrati...     

煤中灰分在水泥熟料烧成中的作用及其机理

通过在水泥生料中掺加不同品质高灰分煤的煤灰,研究了灰分及其组分在硅酸盐水泥熟料液相变化、矿物形成及微观结构中的作用及机理。结果表明,灰分含量的升高是降低液相初析温度的主要原因。随着灰分含量的升高,熟料中间相中Al和Fe的含量增加,尤其固溶的Si明显增多,造成液相粘度增加,阻碍C3S形成。同时,造成熟料矿物分布的均匀性更差,熔蚀现象更多。     

低水胶比下工业废渣与水泥熟料的相互作用

探索了工业废渣与水泥熟料相互作用的定量指标.以掺惰性材料———刚玉粉的水泥水化样作参比样,研究和分析了低水胶比下粉煤灰、煤矸石与水泥熟料的相互作用.实验中粉煤灰掺量为10%~80%,煤矸石掺量为20%~60%,龄期为1~672 h.结果表明,水泥中掺入粉煤灰和煤矸石,由于水泥熟料用量降低而产生的稀释作用促进了水泥熟料的水化,而其他物理化学作用则依工业废渣的掺量、水化样龄期的不同而表现为促进或延缓水泥熟料的水化.     

煅烧煤矸石用作水泥高活性混合材的研究

将经煅烧等过程进行活化处理的煤矸石细粉与磨至一定比表面积的水泥熟料及天然生石膏混合均匀,制成了活化煤矸石粉掺量比例不同的多组混合水泥,并对其胶砂强度性能、标准稠度用水量、胶砂流动度进行了实验检测.同时,还应用SEM对混合水泥硬化浆体的微观结构进行了观察.结果表明,掺入经活化处理的煤矸石粉配制的混合水泥具有较好的强度性能;随掺量增加,水泥浆体的流变性能变差,但对凝结时间并无明显影响.     

Optimization of the content of tricalcium silicate of high cementing clinker

Optimization of the content of tricalcium silicate(C 3 S)of high cementing clinker was investigated.The content of free-CaO(f-CaO),mineral composite,the content of C 3 S in the clinker and the hydration product were analyzed by chemical analysis and X-ray diffraction(XRD).K Valuemethod of QXRD was selected as a quantitative analysis way to measure the content of C 3 S,and the strength of cement paste was determined.The results show that at a water cement ratio of 0.29,the strength of cement paste with 73%C ...     

Composition Design for High C3S Cement Clinker and Its Mineral Formation

A new composition of Portland cement clinker was studied, in which KH, SM and IM was 0.98,2.4 and 2.4 respectively as well as its meal added 1%CuO （in mass）. Fired at 1 200℃,1 350℃,1 400℃ and 1 450℃ for 30 min, the resultant mineral phases component and mineral morphology were analyzed. The performances of the cement which was made of clinker burned at 1 450℃ and fly ash were determined. By means of QXRD, XRD and optical microscopy, it is shown that the clinker burnt at 1 450℃ has the larger size crystals and distinct crystal interface, in which the C3S content is 73.37% and the mineral phases is dominantly C3S, following by minor C2S, C3A and tetracalcium aluminoferrite. The results reveal that a new type of high C3S content clinker can completely be made by traditional temperature-time schedule. The performances of the cement produced from this clinker with addtion of 50% fly ash and 5% gupsum were in agreement with the 32.5 strength grade of Portland fly-ash cement. The results also show that the clinker has a significant effect of saving energy and utilizing waste slag.