粉煤灰基混凝剂的制备及在大麻废水中的应用

采用酸溶法以粉煤灰为基础原料 ,通过添加一定量的硫铁矿烧渣 ,制备成粉煤灰基复合混凝剂 ,确定了最佳工艺条件 .实验结果表明 ,影响混凝剂制备的主要因素是粉煤灰与硫铁矿渣的质量比、酸用量、浸取时间和温度 .此混凝剂对大麻废水中 CODcr去除率达 88% ,色度去除率可达 96.6%以上 ,具有沉淀快和污泥体积小等优点 .     

Studies on high-performance blended/multiblended cements and their durability characteristics

Number of blends were prepared by intergrinding clinker, gypsum, fly ash, calcined clay, microsilica and limestone in laboratory ball mill in varying percentages, and their physical properties such as fineness, consistency, setting time and compressive strength have been determined. The durability tests on selected compositions were also conducted by exposing the mortar cubes separately in 5% Na₂SO₄ and 5% NaCl solutions till the age of 90 and 180 days. The performance was observed by compressive strength development criteria after various length of exposure. Results have been discussed and found that the durability of blended cement is higher than the ordinary Portland cement.     

在线煤灰分检测技术在中国的应用

介绍了应用双能量γ射线透射法测量煤灰分的技术原理及特点;清华大学工程物理系采用该法研制的在线煤灰分仪应用在选煤厂可以指导生产,保证产品质量,提高选煤效率,还可用于介耗<2kg/t的重介质选煤厂及自动配煤系统,为企业创造了显著的经济效益。     

复合矿物功能掺合料对粉煤灰激活增强的研究

根据激发粉煤灰活性机理研制了一种复合矿物功能掺合料,针对其对粉煤灰活性激发增强效果进行了系统研究。结果表明,用Ⅱ级粉煤灰、复合矿物功能掺合料置代50%以上水泥配制的胶砂、普通混凝土和高性能混凝土的早期强度、后期强度均大幅度提高。其中强度等级C15-C100 的混凝土不仅单方可节约水泥 50%以上,而且其强度较单掺粉煤灰有显著提高,具有显著的经济和社会效益。     

循环水处理杀生剂的种类及其发展

介绍了杀生剂的种类及各种杀生剂在工业循环水处理方面的研究和应用现状,分析了目前存在的一些问题以及今后的发展趋势.认为正确解决环境安全与杀生效果之间的矛盾是杀生剂领域所面临的挑战,并对新型杀生剂的开发提出了建议.     

利用粉煤灰生产SiC陶瓷原料

利用粉煤灰部分或全部代替石英砂,配以适量的锯末,在高温炉中特定的烧成制度下,采用SiO2-C还原法将粉煤灰中的二氧化硅与锯末中的碳结合制取高性能的SiC陶瓷原料。利用正交实验对合成工艺中的合成温度、保温时间、碳过量数进行了设计和探索性实验,并对合成产物中的碳化硅的含量进行了测试。研究表明,在经催化剂(FeCl26H2O)浸泡12小时,加入2%矿化剂,在1380℃的合成温度下,保温时间2小时,碳过量10%的情况下,生成的SiC陶瓷原料中SiC的含量在53.6%以上。     

Modelling a circulating fluidized bed riser reactor with gas—solids downflow at the wall

A predictive model was developed for the fully developed zone of a circulating fluidized bed (CFB) riser reactor operating in the fast fluidization regime that overcomes limitations of existing models. The model accounts for the upward flow of gas and solids in the core and downward flow of the two phases in the annulus. Additionally, a numerical solution methodology for the simulation of a riser reactor employing the hydrodynamic model was devised. A simulation was performed using the fast, main Claus reaction to demonstrate the effects of backmixing in the fast fluidization regime. It was found that the molar flow rates of the reactants leaving a fast fluidized CFB riser reactor were significantly higher than those leaving an identical reactor operating in the pneumatic transport regime.     

粉煤灰絮凝剂对高浓度含酚废水的预处理试验研究

本文通过对粉煤灰和硫铁矿烧渣进行酸处理制备出粉煤灰絮凝剂,研究了自制粉煤灰絮凝剂对高浓度含酚废水进行预处理的适宜操作条件,考察絮凝剂投加量及废水pH值对絮凝效果的影响。     

循环冷却水处理新化学药剂的发展

随着水资源的日益紧张和排放标准的日益严格,要求循环冷却水处理药剂能适应高硬度、高碱度、高氯离子、高有机污染的需要,本文介绍的国外的新型药剂－－聚氨基聚醚基甲叉膦酸、膦酰基羧酸、聚天冬氨酸、过氧乙酸、４,５－二氯－２－正丁基－４－异噻啉丁酮等具有优良的阻垢和杀菌作用,并且对环境友好。     

利用城市垃圾焚烧飞灰煅烧水泥熟料初探

针对垃圾焚烧飞灰化学组成上的特点,进行了利用垃圾焚烧飞灰烧制水泥熟料的探索研究,通过试验研究了其对水泥生料的易烧性、烧制的水泥熟料的力学性能和水化速率等的影响规律。研究结果表明,垃圾焚烧飞灰可以用作水泥原料从而有效地降低其处置成本,减少其对环境造成的二次污染,硬化水泥浆体水化28d时各重金属浸出量低于鉴别标准规定的指标,是一种有待开发的潜在的水泥原料资源。