高岭土粉对桔小实蝇的防治作用初探

桔小实蝇是农业生产中重要的农业害虫,防治难度大,寻找新的防治技术对有效防治桔小实蝇有重要意义。本试验探究了高岭土粉对桔小实蝇产卵的影响及触杀效果。结果表明,高岭土粉对桔小实蝇存在驱避效果,桔小实蝇在经高岭土粉处理后寄主表面的停留时间、试探产卵次数均显著低于对照组。将高岭土粉通过浸泡法处理苹果时,桔小实蝇的产卵驱避率可以达到100%。高岭土粉处理组桔小实蝇的存活时间显著低于对照组,具有一定的触杀效果。本研究为今后应用高岭土粉防治桔小实蝇提供了一定依据。

那龙煤矿高岭土粉的应用

一、那龙煤矿高岭土粉开发应用状况高岭土粉的商品名称叫瓷土粉,它的主要矿物组成是高岭石和多水高岭石。橡胶工业用瓷土粉(俗称陶土粉)是专门为橡胶工业加工的、具有补强性能的活性填料产品。它具有改善橡胶性能、提高橡胶制品机械强度、增加耐磨性、促进化学稳定性、延长橡胶制品的老化时间等作用。那龙煤矿生产的瓷土粉还可以代替部分价格昂贵的炭黑和白炭黑,使橡胶制品的成本大为降低。

立式辊磨在煤系高岭土高细粉制备中的应用

根据煤系高岭土干法制粉的工艺系统现状及对制粉系统的要求,介绍了LM型立式辊磨机的结构、工作原理、及针对工艺要求对磨机做的特殊优化,并分享一个实际投产运行的一个案例。结果表明:我公司针对325目高岭土立磨改进的技术路线具有可行性,同时证明立磨在煤系高岭土干法制粉行业中可以满足大规模生产作业,适合推广。

利用GXMB-500型高效磨剥机生产超细高岭土

GXMB-500型高效磨剥机是非金属矿粉体湿法超细的专用设备。本文主要阐述了龙岩高岭土公司用该设备生产超细高岭土粉体的工艺条件和磨剥效果。

Preparation and mechanical properties of polypropylene fiber reinforced calcined kaolin-fly ash based geopolymer

To improve the environmental benefits and solve the problems of large shrinkage and high brittleness, the partial replacement of calcined kaolin by fly ash as a raw material for geopolymer synthesis and the influences of polypropylene (PP) fiber on the mechanical properties and volume stability were investigated. The results show that compressive strength of the geopolymer containing 33.3%(mass fraction) fly ash by steam curing at 80 ℃ for 6 d is improved by 35.5%. The 3-day compressive strength, flexural strength and impacting energy of geopolymers containing 0.05%PP fiber increase by 67.8%, 36.1% and 6.25%, while the shrinkage and modulus of compressibility decrease by 38.6% and 31.3%, respectively. The results of scanning electron microscopy (SEM) and the appearances of crack growths confirm that PP fiber can offer a bridging effect over the harmful pores and defects and change the expanding ways of cracks, resulting in a great improvement of strength and toughness.

新型土遗址修复加固材料试验研究

考虑到土遗址夯筑本体水敏性和稳定性较差的特性,以及长期受自然因素营力作用的影响,采取科学的修复材料补夯的措施可有效抑制土遗址本体残损的进一步发展。以河南地区典型粉砂土为研究对象,制备不同配比石灰-偏高岭土改良材料,研究其对基准土样强度性能的影响和微观机制,并对比分析水硬性石灰土。结果表明:对比NHL,综合考虑石灰-偏高岭土对基准土样击实特性、无侧限抗压强度和强度增长率的影响,采用6﹪-8﹪石灰+4﹪偏高岭土改良粉砂土,在强度特性方面达到了水硬性石灰的修复性能,实现了对粉砂土更好的改良效果。结合SEM发现,掺入偏高岭土后生成的水化产物,可联结土体颗粒、充填空隙,使改良土微观结构更加致密。

Investigation on high-volume fly ash pastes modified with micro-size metakaolin subjected to high temperatures

Portland cement(PC) containing high-volume fly ash(HVFA) is usually used to obtain economical and more sustainable merits, but these merits suffer from dramatically low compressive strength especially at early ages. In this work, the possibility of using micro-size metakaolin(MSK) particles to improve the compressive strength of HVFA paste before and after subjecting to high temperatures was studied. To produce HVFA paste, cement was partially substituted with 70% fly ash(FA), by weight. After that, FA was partially substituted with MSK at ratios fluctuating from 5% to 20% with an interval of 5%, by weight. The effect of MSK on the workability of HVFA mixture was measured. After curing, specimens were subjected to different high temperatures fluctuating from 400 to 1000 ℃ with an interval of 200 ℃ for 2 h. The results were analyzed by different techniques named X-ray diffraction(XRD), thermogravimetry(TGA) and scanning electron microscopy(SEM). The results showed that the incorporation of MSK particles into HVFA mixture exhibited a negative effect on the workability and a positive effect on the compressive strength before and after firing.

科特迪瓦女祭司

在距科特迪瓦海港城市阿比让大约200公里的热带森林里,康冈迪苏地区的阿格尼族人正在准备举行一个奇特的典礼。这个部族是阿康族的一支,原来生活在阿散蒂地区,也就是现在的加纳中部,15世纪时他们迁移到了科特迪瓦东部一片荒无人烟的地方。他们带去了食用薯类和某些植物根茎的习惯,带去了自己的黄金文化,同时也带去了他们的信仰、物神和“高米扬”——女祭司。为什么他们的祭司都是女性呢?因为在西部非洲的母系氏族社会中,妇女拥有很高的权力,所以像通神、医术。