详析陶瓷原料的质量控制及对应分析方法

本文概述了陶瓷原料常用的性能指标及相应的分析方法,并讨论了各项指标在陶瓷生产中的意义,为保证陶瓷原料的稳定性提供了保障基础。     

给水管网硝化作用控制方法研究进展

介绍了氯胺消毒管网中的硝化作用及其控制方法,并对控制方法进行了总结和展望。在采用氯胺消毒的给水管网中,存在着硝化反应发生的可能性。硝化作用会造成出水亚硝酸盐含量升高、消毒剂含量降低、异养菌繁殖等危害。国内外对氯胺消毒管网中硝化作用控制方法的研究主要集中在改变出厂水水质条件-pH、提高消毒剂的浓度、优化氯胺投加方式、管道冲洗、硝化潜能曲线及投加亚氯酸根控制硝化作用。目前以上的控制方法对硝化作用起到了一定的抑制作用,但是存在控制效果不确定、不具有长期性或者增加生成消毒副产物的风险。因此,对硝化作用的控制方法有待深入研究。笔者提出了氯胺、二氧化氯联合消毒控制硝化作用的方法。     

含氮高分子结合与捕获金属离子的能力

介绍和评述了含氮高分子结合与捕获金属离子的能力及评价方法.     

硫酸装置膨胀节选型方案的分析

本文对硫酸装置膨胀节选型问题进行了详细的技术方案讲座和技术经济比较,对存在的一些问题提出了建议和改进措施。     

双管板换热器设计及制造

本文就管板的选材,强度计算,结构设计及胀管方法,胀接的工艺评定等问题作了介绍,仅供设计人员参考。     

毒鼠强中毒检验研究概况及进展

本文概述了十年来毒鼠强中毒检验研究成果及进展。简要描述了四种萃取净化方法,以及定性定量检验方法的特点、检测水平和应用。     

MDC-29型电解槽钢衬玻璃钢槽盖的制作

从材料的选择、衬贴工艺、质量检查、防腐性能等方面详细介绍了用197#树脂制作MDC-29型电解槽钢衬玻璃钢槽盖的过程.其完全能够代替MDC-29型电解槽全玻璃钢槽盖.     

高含尘烟气电除尘器比集尘面积和电源匹配选择的探讨

为保证大型硫铁矿制酸装置净化后烟气含尘量＜0.15 g/m3,在电除尘器前不设旋风除尘器时要求除尘效率＞99.9%.探讨了影响比集尘面积的因素和选值原则,分析了处理高含尘烟气电除尘器应选用高阻电源或恒流电源,电除尘器才能获得最大功率,使其除尘效率达到或接近最高值.     

Effect of Zr substitution on structural,magnetic, and optical properties of Bi0.9Dy0.1Fe1−xZrxO3 multiferroic ceramics prepared by rapid liquid phase sintering method

Zr substituted Bi_0.9Dy_0.1Fe_1−xZr_xO₃ (x=0.03, 0.06 and 0.10) multiferroic ceramics were synthesized by rapid liquid phase sintering technique to improve its multiferroic properties. Rietveld structural refinement of XRD patterns and Raman spectra revealed a partial structural phase transition from rhombohedral (R3c) to biphasic structure (R3c+P4mm) on codoping. The substitution of larger ionic radii and higher valence Zr⁴⁺ ions at Fe-site leads to decrease in the grain size as a result of charge compensation at Fe site. The weak ferromagnetic behavior were observed in all samples along with maximum M_r value of 0.159 emu/g for x=0.03 concentration, which is also endorsed by second order Raman modes. The distortion in FeO₆ octahedra due to Zr substitution leads to splitting of electronic bands of 3.2 eV into multiplets, which in turn reduced the optical band gap value in the range of 2.06–2.10 eV for all samples.     

Hydrothermal synthesis and tuning of size and morphology of α-Co(OH)2 and α-Co2(OH)3Cl nanostructures as precursors for nanosized Co3O4

This study aims to investigate the hydrothermally synthesized cobalt(II) hydroxide-based materials, which will be thermally converted to generate Co₃O₄ nanostructures; an important class of materials characterized by good electrochemical, catalytic and optical properties. First, cobalt(II) hydroxide nanostructures were prepared via hydrothermal hydrolysis of two different precursors (cobalt(II) chloride salt and dichlorobis(thiourea)cobalt(II) complex) exposure to an ammonia atmosphere, and then the obtained α-Co(OH)₂ and α-Co₂(OH)₃Cl nanostructures were calcined to produce Co₃O₄ nanostructures that were characterized by FT-IR, XRD, UV–vis DRS and SEM techniques. The effects of the nature of the precursor, its concentration, and of the temperature and reaction time on size and morphology of the product were also investigated.