化学镀铟集流体对锌粉析氢行为的影响

采用析氢量动态测试方法研究了化学镀铟集流体铜钉与不同产地无汞、低汞锌粉相互作用的动态过程。结果表明：集流体铜钉经无氰化学镀铟处理后,能够降低与锌粉的接触电阻,抑制锌粉腐蚀和氢气的析出。     

氧化锌避雷器试验的探讨

针对氧化锌避雷器的试验,介绍了氧化锌避雷器的绝缘电阻试验、停电条件下的直流试验和运行电压下的交流泄漏电流试验,提出了绝缘电阻试验的不足之处和直流试验的不全面。着重讲述了交流泄漏试验下氧化锌避雷器的全电流、阻性电流和功率损耗的测量方法,并对其有效性进行分析。     

真空断路器操作过电压分析及限制措施

真空断路器在断开感性负荷时，会产生操作过电压。过电压可能损坏电气设备的绝缘，为了限制操作过电压，本文分析了过电压保护应满足的条件以及常规氧化锌避雷器在保护高压电动机相间绝缘时存在的局限性，并介绍了一种新型的过电压保护器，可有效地抑制操作过电压。     

挤压整体锌筒润滑剂的选择

通过理论分析及生产实践 ,说明锌饼在不同挤压成形锌筒条件下 ,为满足正常生产要求 ,应选择合适的润滑剂。介绍了挤压整体锌筒润滑剂的选择和应用情况。     

带串联间隙四星形接法氧化锌避雷器对高压电动机保护作用分析

分析真空断路器操作过电压产生的原因 ,论述了不带间隙及带串联间隙的氧化锌避雷器对高压电动机相对地、相对相之间的绝缘保护存在的问题 ,介绍一种带串联间隙采用四星形接线的组合式氧化锌避雷器     

New hybrid materials as Zn(II) sorbents in water samples

Mesoporous silicas have been chemically modified with 5-mercapto-1-methyltetrazole (MTTZ) obtaining hybrid materials denominated MTTZ-MSU-2 and MTTZ-HMS. These materials were employed as Zn(II) sorbents from aqueous media at room temperature. The effect of several variables (stirring time, pH, presence of other metals) has been studied using batch and column techniques. Flame atomic absorption spectrometry (FAAS) was used to determinate Zn(II) concentration in the filtrate or in the eluted solution after the adsorption process. The results indicate that under pH 8, the maximum adsorption value was 0.94 ± 0.01 and 0.72 ± 0.01 mmol Zn(II)/g for MTTZ-MSU-2 and MTTZ-HMS, respectively. In tap water samples, a preconcentration factor of 200 was obtained. On the basis of these results, it can be concluded that it is possible to modify chemically MSU-2 and HMS with 5-mercapto-1-methyltetrazole and to use the resulting modified mesoporous silica as an effective adsorbent for Zn(II) in aqueous media.     

溶液一步法制备氧化锌纳米棒

以氯化锌(ZnC l2)、氢氧化钠(NaOH)为原料,分别以十二烷基磺酸钠(SDS)和十六烷基三甲基溴化铵(CTAB)为表面活性剂,采用溶液一步法合成了氧化锌(ZnO)纳米棒。结果表明,合成的ZnO纳米棒直径为20~40nm,长度达150nm~2μm。     

利用铅银渣综合提取锌铅银的试验研究

对某湿法炼锌厂的铅银渣进行了综合提取锌铅银的探索试验。结果表明,采用"水洗脱锌—氧化焙烧—氰化浸银—氯化浸铅"的湿法工艺,获得了锌、银、铅的浸出率分别为70%、96.42%、90.49%的技术指标,为该类型冶炼废渣提供了一条新的综合利用途径。     

Solar hybrid photo-thermochemical sulfur-ammonia water-splitting cycle: Photocatalytic hydrogen production stage

One of the main limitations of existing solar thermochemical water-splitting cycles (WSC) are that they utilize only thermal component of the solar irradiation neglecting its photonic component. A new hybrid photo-thermochemical sulfur–ammonia (HySA) WSC developed at the Florida Solar Energy Center allows circumventing this shortcoming. In the HySA cycle, water splitting occurs by means of solar beam splitting which enables utilization of the quantum (UV–Vis) portion of the solar spectrum in the hydrogen production stage and the thermal (IR) portion in the oxygen production stage. Present work investigates the photocatalytic hydrogen production step using narrow band gap CdS and CdSZnS composite photocatalysts, and ammonium sulfite as an electron donor. The choice of the electron donor was determined by the considerations of its regenerability in the thermal stages of the HySA cycle. This article examines the impact of photocatalyst and cocatalyst loading, temperature, and light intensity on hydrogen production rates. Photocatalysts, cocatalysts and photoreaction products were analyzed by a number of materials characterization (XRD, SEM, TEM, EDS) and analytical (GC and IC) methods. The experimental data obtained provide guidance for the improved solar photoreactor design.