低浓度拜耳赤泥充填材料制备及水化机理

针对矿山充填中拜耳法赤泥利用率较低或低浓度赤泥充填材料存在强度低、泌水量高、易收缩等问题,研究粉煤灰添加比例、脱硫石膏、石灰及激发剂对赤泥充填材料早期强度及体积稳定性的影响,采用扫描电子显微镜-能谱仪（SEM-EDS）和X射线衍射（XRD）分析手段探讨赤泥基充填材料的水化机理。结果表明,脱硫石膏促进钙矾石的生成,石灰促进粉煤灰火山灰效应,激发剂可以加快赤泥?粉煤灰水化反应进程,三者协同作用提高赤泥充填体强度。充填材料28 d抗压强度3.35 MPa,且初始及60 min流动度在200 mm以上。微观实验表明,硬化体水化产物为钙矾石、硬柱石、硅铝酸盐凝胶类矿物,水化产物通过填充孔隙,提高浆体强度。赤泥基充填材料固体废弃物利用率达到92%,无泌水,无沉缩,具有较高的经济价值和环保价值。      

尾砂溢流水对膏体充填体强度影响研究

为了研究尾砂溢流水对废石-全尾砂膏体充填体的影响，通过扫描电镜、X射线衍射(XRD)等试验方法，分析尾砂溢流水、尾砂的粒级分布、化学成分，探讨尾砂溢流水对水泥质量、膏体充填体强度的影响，并论证尾砂溢流水导致后期强度降低的机理。结果表明：尾砂溢流水的化学成分满足井下膏体充填用水要求，添加尾砂溢流水较新水充填体前期强度提高16%～34%;但后期充填体强度由于酸性环境和含硫尾砂的影响，充填体强度降低约14%。     

电厂灰渣制备井下膏体充填材料试验研究

为了探究不同灰渣对充填体强度的影响,将流化床底渣、流化床飞灰和粉煤灰按不同比例混合,作为充填骨料,普通硅酸盐水泥作为胶结材料,加水制备膏体材料,进行流动度测试和抗压强度试验。结果表明：（1）流化床灰渣中含有部分胶凝成分,粉煤灰具有减水作用和一定的火山灰活性,二者均为良好的井下充填材料。（2）当膏体材料含水率超过其饱和含水率时,膏体流动性会大幅提高,充填材料发生离析、脱水,导致充填体强度降低。（3）当流化床底渣、飞灰和粉煤灰配比为6∶2∶1,水泥含量为10%,料浆浓度为73%时,坍落度为20 cm,充填体28 d强度可达3.3 MPa。此配比在满足料浆流动度和充填体强度要求的同时,使充填成本大幅降低。（4）将上述配比作为对照组,进行级配优化试验,将原状底渣进行破碎后作为细骨料,以不同比例取代原状底渣。当底渣破碎至粒径小于等于5 mm,取代率为10%~15%时,充填体7 d强度达到2.4 MPa,28 d强度可达3.5 MPa,充填体强度明显提高。该研究结果为电厂灰渣在黄金矿山充填工程中的应用提供了参考和借鉴。     

尾砂胶结充填对井下水环境影响评价

为准确了解充填体充填至采空区对井下水环境的影响,进行室内充填体试块的泌水和有毒有害物质浸出试验。以某有色金属矿现有充填方式为例,选取充填料浆浓度78%,充填配比水泥∶粉煤灰∶跳汰砂=1∶1∶10的充填体进行试验。试验结果表明:充填体对井下水环境影响不大;充填料浆泌水自身污染物成分均不高,混入井下涌水后对其水质影响较小,主要污染物成分基本不变;浸出试验中有毒有害物质增加,但考虑试验周期长(20 d),对井下水环境的影响可以忽略。     

复合激发剂对铜炉渣活性影响及充填材料制备

为了实现铜炉渣的废物利用,以碱激发方式为主研究铜炉渣制备矿用胶凝材料的可能性.选取生石灰、NaOH和早强剂组成的混合物作为复合激发剂,开展铜炉渣活性激发和充填材料制备试验,并采用X射线衍射和扫描电子显微镜对铜炉渣水化产物进行分析.试验结果表明,各激发剂对铜炉渣活性的影响顺序依次为生石灰 > 早强剂 > NaOH,在复合激发剂的作用下炉渣净浆试样的7和28 d强度分别可以达到1.5和3.0 MPa以上.铜炉渣尾砂充填料28 d强度为1.0 MPa,流动性良好,满足充填材料要求.铜炉渣早期水化产物主要有片状的Ca(OH)₂和C-S-H凝胶,随着养护时间的增加,C-S-H凝胶Ca/Si比不断减小,水化产物结构更加致密.养护时间至28 d时,铜炉渣中活性成分基本反应完全.      

粉煤灰化学活性激发及应用

采用碱性激发剂、盐激发剂与混凝土外加剂等来激发粉煤灰的活性。通过多种激发剂复掺 ,寻找粉煤灰化学活性激发的最佳效果 ,得到最佳强度 ,使粉煤灰能得到很好的利用。并通过扫描电镜分析、X射线衍射试验和差热分析等方法探讨其水化机理     

利用烧结脱硫灰渣制备新型充填胶凝材料试验

烧结脱硫灰渣是半干法脱硫排放的废弃物.灰渣含有亚硫酸钙和飞灰等不稳定矿物成分,使得该废弃物利用面临困难.针对铁矿全尾砂胶结充填法采矿对廉价的胶凝材料的需求,采用烧结脱硫灰渣和水淬渣,开展了制备全尾砂充填胶凝材料试验研究.以生石灰作为碱激发剂,硫酸盐作为辅助激发剂,对矿渣微粉活性实施复合激发.首先采用正交设计进行试验方案设计;然后采用极差分析对数据进行处理和配比决策,最后以阶段嗣后充填采矿对其强度要求,建立并求解全尾砂新型充填胶凝材料的优化模型,获得了充填胶凝材料的优化配比.结果显示,当胶砂比为1∶8、料浆浓度为68%时,以生石灰和烧结脱硫灰渣作为水淬渣复合激发剂制备的新型充填胶凝材料,烧结脱硫灰渣比例达到10%时,3 d、7 d及28 d的胶结充填体强度不低于相同条件下的32.5R早强水泥,而胶凝材料成本低于水泥材料.     

镍渣基矿井充填用胶凝材料的制备

以提高矿业固体废弃物综合利用水平,降低矿山充填采矿成本为目的,本文开展了利用水淬镍渣制备矿山井下充填用胶凝材料的研究.分别采用机械活化和化学活化的方法,对水淬镍渣进行了提高其胶凝性能的探讨.以井下充填体的强度指标为评价标准,分析了磨矿细度和激发剂对水淬镍渣活性的激发程度和胶凝性能的影响,对水淬镍渣的化学活化机理进行了分析.研究结果表明,以活化处理的水淬镍渣为主要原料(占原料总量的85%)制备的胶结剂,可以作为水泥的替代品用于矿井充填料的生产.      

干法脱硫粉煤灰物化性能及用于建材的安全性研究

对宝钢电厂干法脱硫粉煤灰的物化性能和安定性进行了系统的试验研究,并与国内相似电厂干法脱硫产物进行对比,分析其在建材中应用的可行性。研究结果表明,宝钢干法脱硫粉煤灰是一种高钙高硫型灰渣,具有火山灰活性特征,含有硫酸盐、亚硫酸盐成分,易形成硫酸盐激发,其强度活性高于普通粉煤灰。但过高的亚硫酸钙和游离氧化钙会存在一定的安定性隐患,因此在建材中应用时需进行质量检测和掺量控制。     

基于PCA-BP神经网络模型的充填体强度预测

充填体强度预测对矿山充填设计具有重要意义。选取胶砂比、水泥、石灰、石膏及矿渣含量作为充填体强度影响因素,借助主成分分析（PCA）消除自变量间相关性,降低数据维数,再结合BP神经网络具有较好预测性的特点,建立了PCA-BP模型以预测充填体强度。对18组充填体试验数据进行主成分分析,5个影响因子降维为3个主成分,将其作为BP神经网络的输入因子,进而探讨了隐含层神经元个数对充填体强度训练和预测精度的影响,并比较了PCA-BP神经网络、标准BP神经网络和二次线性回归效果。结果表明：PCA-BP模型最佳预测结构为3-7-1;PCA-BP神经网络结果优于BP神经网络和二次线性回归;PCA-BP神经网络训练和预测的最大相对误差仅为3.65%,实现了充填体强度的准确预测。PCA-BP模型为充填体强度预测提供了一种高精度的分析方法。     

增大穿孔机送进角 提高穿孔效率的实践

通过增大穿孔机送进角,减小轧辊出口锥角,从而提高了穿孔效率,降低了单位能耗,收到了较好的效果。     

凸轮实际轮廓线的设计

用图解法设计直动、滚子从动件盘形凸轮机构时，一般利用反转法，先按尖顶从件设计出理论轮廓线，再以理论轮廓线为圆心、以滚子半径为半径画很多的圆，再画包络线得出滚子从动件的实际轮廓线。用减半径法直接设计出盘形凸轮的实际轮廓线，提高了效率与设计精度。     

清代岭南与岭外词人交流考论

清代岭南词人与岭外有着不断的词学交流,这对岭南词有积极的影响。首先,词学交流促进了清代岭南词人的成长与岭南词的发展。另外,这种交流有助于清岭南词人与岭南词地位的提升。再者,词学交流还对岭南词风的嬗变有重大的影响。     

Proceedings of the American Psychological Association, Incorporated, for the Year 1972: Minutes of the Annual Meeting of the Council of Representatives.

In September 1967, the Council of Representatives voted that beginning in 1968, it would meet for only one day midway during the Annual Convention to act on essential routine business and to receive the agenda for its major meeting, to be set for a minimum of two days at a date apart from the Annual Convention. In accordance with that vote, the Council met in Honolulu, Hawaii, on September 5, 1972, at the Annual Convention, and in Washington, D.C., on December 2 and 3, 1972. The roll of representatives was called at both meetings, and more than a quorum answered to their names. These minutes constitute the official record of actions of the Association taken during the year. Reference is made to various reports, some of which will be published elsewhere. Copies of these reports were distributed to Council members and are on file in the Central Office. Extra copies of many of them are available from the Central Office as long as the supply lasts. The Board of Directors met six times during the year. All substantive actions of the Board taken during the year were reported to Council and are included in these minutes. Further details of the Board's actions are to be found in the minutes of each meeting. As in previous years, these minutes are organized in topical rather than chronological order. The main headings used are: (1) Minutes of Meetings in 1971-1972; (2) Elections, Awards, Membership, and Manpower; (3) Ethics, and Social and Ethical Responsibility; (4)Board of Directors; (5) Divisions and State Associations; (6)Organization of the APA; (7) Publications and Communications; (8) Convention Affairs; (9) Educational Affairs; (10) Professional Affairs; (11) Scientific Affairs; (12) External Affairs; (13) Central Office; (14) Financial Affairs; and (15) Communications from Outside Organizations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Proceedings of the American Psychological Association, Incorporated, for the Year 1977: Minutes of the Annual Meeting of the Council of Representatives.

These minutes constitute the official record of actions of the Association taken during the year, by both the Council of Representatives and the Board of Directors. The roll of Representatives was called at each meeting, and more than a quorum answered to their names. Reference is made in these minutes to various reports, some of which will be published elsewhere. Copies of these reports were distributed to Council members and are on file in the Central Office. As long as the supply lasts, extra copies of many of the reports are available from the Central Office. The Board of Directors met five times during this Association year. All substantive actions of the Board were reported to the Council and are included in these minutes. Further details of the Board's actions are to be found in the minutes of each meeting. As in previous years, these minutes are organized in topical rather than chronological order. The main headings used are: (1) Minutes of Meetings in 1977-1978; (2) Elections, Awards, Membership, and Human Resources; (3) Ethics; (4) Board of Directors; (5) Divisions and State Associations; (6) Organization of the APA; (7) Publications and Communications; (8) Convention Affairs; (9) Educational Affairs; (10) Professional Affairs; (11) Scientific Affairs; (12) Social and Ethical Responsibility for Psychology; (13) External (International) Affairs; (14) Central Office; (15) Financial Affairs; and (16) Communications Concerning Outside Organizations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

“物体-地球”系统在地球参照系中的力学规律讨论

论析了在地球参照系中对“物体—地球”系统动量守恒定律不能成立而功能原理却能适用的原因。     

自动化绘图在多功能机组主梁预制拱度中的应用

本文基于多功能机组主梁拱度曲线的绘制,结合各计算机软件的功能,针对复杂函数曲线的图形绘制,应用Autocad软件并结合Microsoft Excel软件中的数据计算,实现了曲线图形的自动化绘制.其中利用Microsoft Excel完成了曲线各点坐标数据的创建,然后应用Autocad绘图功能实现了坐标数据向曲线图形的转...     

河西金矿围岩蚀变与矿化富集规律研究

通过对河西金矿近矿围岩蚀变及矿化富集规律的研究,作者认为围岩蚀变属于岩浆期后热液交代作用形成。受断裂构造带影响,形成断裂蚀变带,对金的富集成矿起到了一定的作用,并讨论了围岩蚀变与矿化富集规律在找矿方面的指导意义。     

锡同位素在青铜器锡料来源研究中的应用探讨

锡料是青铜器生产的关键物质资源,其来源及流通途径问题是中国乃至世界范围内青铜时代研究的重要议题之一。通过对锡同位素这一新兴锡料溯源方法的梳理归纳,结合地中海青铜时代青铜器锡料来源研究的应用实践,以及对中国盘龙城遗址和琉璃河遗址锡料来源的初探,为中国青铜器锡料产地与来源等考古问题的解决提供新思路。