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。     

铁质原料对水泥熟料矿物形成及性能的影响

利用ＸＲＤ,ＯＭ,强度测定和化学分析等方法研究了不同铁质原料对硅酸盐水泥熟料矿物形成和熟料性能的影响,结果表明,掺加铜矿渣的生料具有更好的易烧性,能增加液相量,有利于熟料烧结,并能改善熟料的岩相结构和力学性能。     

磷渣基复合矿化剂对水泥熟料烧成的影响

研究了在水泥生料中掺入不同矿化剂对水泥生料的易烧性、硅酸盐水泥熟料矿物形成和岩相结构的影响：结果表明，与传统的萤石和磷渣矿化剂相比，磷渣与萤石复合的矿化剂可有效降低水泥熟料中游离氧化钙（f-CaO）的含量，改善生料的易烧性；在煅烧温度与时间增加的情况下，改善作用仍然明显；通过XRD、SEM与岩相结构分析表明，磷渣与萤石的复合矿化剂降低了液相的粘度，促进了A矿的生长，对矿物的结晶形态有改善作用，有利于晶体尺寸的生长发育。     

高硫煤对熟料矿物形成及显微结构的影响

通过高温显微镜(HTM)、XRD、熟料化学分析和岩相分析等测试手段和分析方法,探讨了高硫煤对硅酸盐水泥熟料烧成及熟料显微结构的影响。结果表明,煤中硫可降低熟料液相出现温度,但过高的硫使生料在较高温下(≥1 300℃)的易烧性变差,不利于C3S矿物形成,最终使熟料中A矿数量减少而B矿增加;硫的存在虽阻碍了C3S形成,但又在一定程度上促进了A矿、B矿晶体的发育,使晶体尺寸增大。     

SO3对阿利特—硫铝酸盐水泥熟料中C3S,C4A3S^—矿物形成影响？…

以纯化学试剂配料,研究了ＳＯ３对阿利特－硫铝酸盐水泥熟料中Ｃ３Ｓ,Ｃ４Ａ３Ｓ＾－矿物形成的影响。结果表明,一定量的ＳＯ４能改善生料的易烧性,促进系统中ｆ－ＣａＯ的吸收,并能保证Ｃ４Ａ３Ｓ＾－矿物良了形成及有利于Ｃ３Ｓ的形成,而当ＳＯ３含量较高时,将阻碍Ｃ３Ｓ的形成并导致熟料中ｆ－ＣａＯ升高。     

R_2O、R_2SO_4 对硅酸盐水泥熟料烧成的影响

采用化学分析、ＸＲＤ、光学显微镜分析等方法,较系统地研究了Ｒ２Ｏ、Ｒ２ＳＯ４对硅酸盐水泥熟料烧成、矿物组成、晶体结构的影响。结果表明：Ｒ２Ｏ易形成固溶体ＫＣ２３Ｓ１２和ＮＣ８Ａ３,其中Ｋ２Ｏ主要固溶在Ｃ２Ｓ中,形成ＫＣ２３Ｓ１２,使ｆＣａＯ急剧升高;Ｎａ２Ｏ主要固溶在Ｃ３Ａ中,形成ＮＣ８Ａ３,ｆＣａＯ有所增加。Ｒ２ＳＯ４降低了熟料烧成的液相粘度,对熟料烧成有利,ｆＣａＯ含量很低。Ｒ２Ｏ和Ｒ２ＳＯ４都使Ａ矿含量降低,晶体尺寸增大。     

R2O,R2SO4对硅酸盐水泥熟料烧成的影响

采用化学分析、ＸＲＤ、光学显微镜分析方法,较系统地研究了Ｒ２Ｏ、Ｒ２ＳＯ４,对硅酸盐水泥熟料烧成,矿物组成,晶体结构的影响。结果表明：Ｒ２Ｏ易形成固 ＫＣ２３Ｓ１２和Ｎ８Ａ３,其中Ｋ２Ｏ主要固溶在Ｃ２Ｓ中,形成ＫＣ２３Ｓ１２,使ｆｃｏ急剧升高;Ｎａ２Ｏ主要固溶在Ｃ３Ａ中,形成ＮＣ８Ａ３,ｆｃａＯ有所增加,Ｒ２ＳＯ４降低了熟料烧成的液相粘度,对熟料烧成有利,ｆｃａｏ含量很低,Ｒ２Ｏ和Ｒ２ＳＯ４都使Ａ     

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.     

煤矸石代替黏土生产水泥可行性分析

为了研究煤矸石代黏土生产水泥的可行性,对10个省份28个矿点进行取样,开展煤矸石特性分析.分析结果表明,煤矸石具有高灰分、高硫分和低热值等特点,化学成分与黏土相近,还含有较丰富的微量元素和矿物组成.对煤矸石、中钙石灰石和硫酸渣等配料进行煅烧试验,试验表明,煤矸石在煅烧时,微量元素和矿物释放其储存的地质能量,加速促进硅氧键的断裂,比黏土配料更早生成硅酸三钙、硅酸二钙和铝酸三钙等水泥熟料矿物.煅烧过程中放出的二氧化硫与钙铝氧化物反应形成早强硫铝酸盐水泥熟料矿物,从而减少硫化物对环境的污染.     

利用粉煤灰、拜耳法赤泥制备贝利特硫铝酸盐水泥

以粉煤灰、拜耳法赤泥为原料制备贝利特硫铝酸盐水泥,研究赤泥掺入及掺入量变化对水泥熟料烧结温度、工作性能、力学性能的影响,借助XRD分析熟料的矿物组成及各矿物含量。结果表明:利用粉煤灰、拜耳法赤泥能制备出各项性能合格的贝利特硫铝酸盐水泥。赤泥的掺入能降低熟料的烧成温度,一定量赤泥的掺入能促进C4A3S矿物的形成,提高水泥的抗压强度。当掺入量超过8%(质量分数)时,会引起强度的下降。赤泥掺量为4%时,所制水泥的28 d抗压强度达到48.9 MPa。     

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.     

Preparation of Super Composite Cement with a Lower Clinker Content and a Larger Amount of Industrial Wastes

The effects of the grinling mode ,finencess,gypsum kinds and dosage,mix proportions on properties of the composite composite cements consisting of slag ,fly ash ,limestone and a lowr content clinker were investigated,respectively ,The results show that when thre proportions among slag ,fly ash and limestone are appropriate ,the grinding technology and system are reasonable ,the optinized gypsums and addities are effective,the 52.5R grade cement (52.5R grade cement menas a higher strength than 52.5 at ealy age) can be prepared by clinker dosage of 50% in weight,the 42.5R or 42.5 ,32.5 grade composite cement containing 40% and 30% clinker also may be made ,respectively ,Moreover,the high perfomance concrete preparde from the abover composite cements was studied experimentally.     

利用高钙粉煤灰生产粉煤灰水泥的试验研究

研究了高钙粉煤灰水泥的细度及活性激发剂对其物理性能的影响。研究结果表明,高钙粉煤灰水泥的安定性和各龄期的抗折、抗压强度均随着水泥的细度的提高和活性激发剂的掺入而提高,活性激发剂具有加速水泥矿物和ｆ Ｃａ Ｏ 水化的作用。采用５２５＃ 熟料,掺加３０％ 的高钙粉煤灰时,水泥的比表面积在３４０～４００ ｍ ２ ／ｋｇ 和掺入１％ 的活性激发剂,能够稳定生产４２５＃ 高钙粉煤灰水泥。     

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.     

差热法测定生料煤含量的实验研究

运用差热分析折原理，对差热法测定水泥生料煤含量的方法进行研究，找到一种新的水泥生料煤含量测定方法－差热测煤法，力图为实现立窑水泥生料的均匀配料和熟料的稳定烧成，提高立窑水泥熟料质量提供可行的测热方法。     

RAW MEALS CONTAINING TRACE RE OXIDES TO IMPROVE QUALITY OF CEMENT CLINKER

Clay or industrial wastes containing trace rare earth(RE) oxides as one of the components are used to burn cement clinker.When the total amount of RE oxides reaches 0.2×10~(-4)-2.0×10~(-4)(wt), it has positive effect on the burnability of raw meals, and the Alite content in clinker increases.However,with the addition of lanthanide, the formation process of clinker and the distribution of lanthanide in clinker are different from those of yt trium.If the burning temperature is 1450 C, yttrium shows negative effect on the formation of clinker. There fore to improve the quality of cement clinker, the raw meals in which yttrium content is lower and lanthanide content is higher is preferable; to reduce the consumption of coal, the raw meals that yttrium content is higher is suitable.Using raw meals containing trace RE oxides can reduce the cost of fluorite and protect environment.     

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.     

粉煤灰矿渣复合水泥试验研究及其应用

通过试验研究了粉磨方式、细度、复合组分比例及添加剂对粉煤灰、矿渣、石灰石与少量熟料组成的复合水泥性能的影响 .研究结果表明 :当以上三组分比例适当时 ,通过添加剂的有效作用 ,采取合理的粉磨工艺和制度 ,在熟料掺量 5 0 %时可以配制出 6 2 5R或 6 2 5复合水泥 ,熟料掺量 4 0 %可以配制出 6 2 5或 5 2 5R复合水泥 ,熟料掺量 30 %可以配制出 5 2 5或 4 2 5R复合水泥 .同时 ,对上述部分水泥配制的高性能混凝土进行了试验研究