Synthesis of a carbamide-based dithiocarbamate chelator for the removal of heavy metal ions from aqueous solutions

This study was carried out to develop a carbamide-based dithiocarbamate (CDTC) chelator for the removal of heavy metal ions from wastewater. Its structural properties were characterized by FT-IR, ¹H NMR and ¹³C NMR. Results confirmed the functional groups of HNC(S)S existed. The adsorption isotherms showed CDTC had a high adsorption capability for Zn (119.8 mg/g) and Cu (63.1 mg/g). It exhibited a distinctive selectivity for the removal of metal ions (Cu²⁺ > Zn²⁺ > Cr³⁺ > Pb²⁺ > Cd²⁺) as they coexisted. The influence of initial pH of wastewater for the removal efficiency of metal ions was also investigated and a pH > 7 was preferred.     

蔗渣浆ECF漂白生产实践

ECF漂白技术在蔗渣浆漂白生产中成功应用,漂后浆的品质提升,废水污染负荷降低,达到清洁生产要求,提升了企业的核心竞争力.     

二氧化氯发生器在综合法二氧化氯生产中的应用评述

简要介绍了综合法二氧化氯生产工艺原理,阐述了卧式二氧化氯发生器和立式二氧化氯发生器的设备结构和工艺特点,并结合生产实践分析了两种发生器生产工艺的应用情况,为综合法二氧化氯制备系统中发生器工艺的选择提供参考。     

Strong and optically transparent biocomposites reinforced with cellulose nanofibers isolated from peanut shell

Cellulose nanofibers–reinforced PVA biocomposites were prepared from peanut shell by chemical–mechanical treatments and impregnation method. The composite films were optically transparent and flexible, showed high mechanical and thermal properties. FE-SEM images showed that the isolated fibrous fragments had highly uniform diameters in the range of 15–50 nm and formed fine network structure, which is a guarantee of the transparency of biocomposites. Compared to that of pure PVA resin, the modulus and tensile strength of prepared nanocomposites increased from 0.6 GPa to 6.0 GPa and from 31 MPa to 125 MPa respectively with the fiber content as high as 80 wt%, while the light transmission of the composite only decreased 7% at a 600 nm wavelength. Furthermore, the composites exhibited excellent thermal properties with CTE as low as 19.1 ppm/K. These favorable properties indicated the high reinforcing efficiency of the cellulose nanofibers isolated from peanut shell in PVA composites.     

冲激技术在常规间歇蒸煮中的应用

通过介绍冲激技术在某浆厂间歇蒸煮中的应用,说明冲激程序操作是一种有效的立锅蒸煮的辅助技术,合理使用,可提高蒸煮质量和稳定生产,减少故障。     

二氧化氯吸收塔的材料选用及制造安装

介绍了二氧化氯吸收塔结构,对各部位材料的选用进行探讨,重点对陶瓷填料的选择进行了对比,并阐述了二氧化氯吸收塔制造安装的要点,表明可以制造出价格合理、经久耐用的二氧化氯吸收塔。     

生产用水对制备二氧化氯的影响及改进措施

甲醇还原法制备二氧化氯的生产过程中生产用水的水质对生产影响大,采取改进措施,改善水源,定期清污除垢,确保反应系统稳定、高效、安全生产运行。     

二氧化氯制备系统中钛设备的选材

结合二氧化氯制备工艺对该系统中钛设备的材质选择要点进行了评述,并对相关钛设备的制造与使用注意事项进行了介绍,供设备设计与使用等参考。     

甲醇法二氧化氯制备中副产物酸性芒硝的综合利用研究

为满足国家日益严格的环保要求,制浆厂采用ECF漂白成为当今纸浆漂白的一种主流趋势,二氧化氯制备及副产物利用相关技术成为亟待解决的问题。文章介绍了二氧化氯副产物酸性芒硝的综合利用方法,首先探讨了酸性芒硝复分解反应制备中性芒硝工艺,重点对中性芒硝真空过滤脱水与短程干燥技术进行了研究,即先将中性芒硝浆料送至真空过滤机洗涤过滤脱水,再经流化床干燥器干燥制得无水硫酸钠粉末(元明粉),通过芒硝干燥实验,对比循环流化床与振动流化床干燥效率,为流化床干燥器的选型提供了依据。采用该工艺制得的元明粉,产品指标符合GB/T6009-2003Ⅱ类优等品标准,产品质量高,能源消耗少,具有工艺简单,操作方便,成本低的优点。