氟化铝生产废水处理工艺的研究

对氟化铝生产废水的处理方法进行了研究。结果表明，一级中和沉淀法和二级中和二级沉淀法均不宜用于氟化铝生产废水的结果，理想的处理方法是碱过量中和酸回调法，辅加氯化钙的石灰乳中和法也可考虑采用。     

活化高岭土适宜煅烧温度

影响高岭土适宜煅烧温度的因素包括煅烧时间、升温速度、煅烧气氛、炉窑、煅烧方式,生料颗粒堆集状态等,但最不可控的因素是高岭土本身的性质。任一“最佳煅烧温度”都是针对某一具体情况的。选择高岭土适宜煅烧温度既要考虑技术因素．又须兼顾经济效果。对于某种性质未知的高岭土,最简单的选择其适宜煅烧温度的方法是通过DTA／TGA来进行。     

The effect of various slaked limes on the microstructure of a lime-cement-sand mortar

The present work aims to provide a better understanding of the effect of both the proportions and the characteristics of slaked lime on the microstructure of a lime-cement-sand mortar. Cement (CPA CEM I 52.5) has been replaced by various categories of slaked lime chosen for the diversity of their physico-chemical characteristics.Cement has been replaced by lime in proportions varying between 0 to 10% of the total binder mass. With very few exceptions, mortars were produced by maintaining the quantity of water constant.Experimental results show that it is necessary to have a high lime substitution percentage to influence the microstructure of the mortar, except in the case of a lime containing magnesium hydroxide or calcic lime featuring sizeable specific surface area.The influence of the nature of the substituted lime on the development of the microstructure in the matrix has been examined by SEM observations of the mortar micro porosity.     

Groundnut Yield Response to Single Superphosphate, Calcitic Lime and Gypsum on Acid Granitic Sandy Soil

Phosphorus and calcium are the major nutrients limiting groundnut production. The objectives were to determine (a) optimum application levels of P and Ca, and (b) compare the effectiveness of calcitic lime (40% Ca, 4.5% Mg) and gypsum (22% Ca, 17% S) as sources of Ca for groundnut grown on sandy soils. Field experiments were established in smallholder farming areas using four levels of P (0, 8.5, 17 and 34 kg ha⁻¹) combined factorially with calcitic lime (0, 200, 400 and 800 kg ha⁻¹) to give 16 treatments. Similar levels of P were combined factorially with gypsum (0, 100, 200 and 400 kg ha⁻¹) to give sixteen treatments. Experiments were laid in a randomized complete block design with three replications. Phosphorus had a significant effect on groundnut yield at the majority of the experimental sites. Application of P at 8.5 kg ha⁻¹ gave the optimum groundnut yield response. The optimum application rates for calcitic lime and gypsum were 200 and 100 kg ha⁻¹. Gypsum and calcitic lime were not significantly different as sources of Ca for groundnut. Soil chemical properties were significantly improved following application of P and Ca sources.     

以高活性度石灰为原料制备纳米碳酸钙的研究

采用间歇鼓泡碳化法，通过对碳化反应温度、灰乳体积质量、搅拌转速、气体分布器开孔直径、消化浆液陈化时间等影响因素的控制，得到了用高活性度石灰为原料制备纳米碳酸钙的优化工艺条件，制得了平均粒径为15～40nm的纳米碳酸钙产品。     

高C3S含量硅酸盐水泥熟料极限石灰率值选择及控制方法的探讨

分析了不同C3S含量硅酸盐水泥熟料的矿物形成过程、易烧性及矿相结构差异,对高C3S含量硅酸盐水泥熟料适宜的极限石灰率值选择及控制方法进行了探讨。分析表明,高C3S含量硅酸盐水泥熟料的配料,宜采用李和派克石灰饱和系数LSF控制极限石灰数量,无论硅酸率及铝氧率如何变化,LSF值必须<1。对于低硅酸率高C3S含量熟料,LSF应偏低控制,对于高铁配方熟料,LSF宜偏低控制;视硅酸率不同,熟料LSF低限值可至0.96附近。     

液压钟帽不停风卸灰装置

在考察了国内现行的不停风星形卸灰装置后，针对其利弊，开发了以钟帽为密封阀，液压为动力的不停风卸灰装置，从而提高了国产竖式混料石灰窑的产量，应用效果良好。     

分散性粘土筑坝质量控制

南引水库除险加固工程一项重要的施工内容为分散性粘土处理。处理的方法采用分散性粘土掺加一定比例白灰,将分散性粘土变成非分散性粘土,保证土坝力学性能稳定,满足水库蓄水要求。阐述了分散性粘土筑坝质量控制要点。     

二灰稳定煤矸石基层材料温缩性能的试验

目的 为了探讨二灰稳定煤矸石材料对于环境温度变化的敏感性以及应用于寒冷地区路面基层的可行性.方法 采用电测法研究二灰稳定煤矸石温缩性能.结果 二灰稳定自燃煤矸石的温缩性能明显优于二灰稳定未燃煤矸石;二灰稳定煤矸石的平均温缩系数随着二灰质量比的减小呈抛物线规律变化,在二灰质量比为1:3左右时最大.结论 二灰稳定煤矸石基层材料的温缩性能与煤矸石集料的种类以及二灰质量比有关;与其他半刚性基层材料相比,二灰稳定煤矸石基层材料具有较好的温缩性能.适合于用作寒冷地区道路的路面基层.     

石灰改良膨胀土无侧限抗压强度试验

结合广西南友公路膨胀土路堤试验段,开展石灰改良膨胀土无侧限抗压强度试验。结果表明：素膨胀土试件浸水后全部崩解,该区膨胀土的水稳性很差;部分养生7 d和14 d的石灰改良土试件也在浸水时崩解,主要是由于龄期较短,改良土中产生的CaCO3较少导致联结作用较弱,改良土无侧限抗压强度采用养生28 d龄期的强度值较合适;掺灰率和养护龄期对改良土无侧限抗压强度的影响较大,且石灰改良土存在最优掺灰率,无侧限抗压强度与龄期在养护初期表现为线性增大关系。