An electrochemical technique to deposit thin films of PbTe

PbTe thin films were deposited electrochemically on transparent conducting oxide coated (TCO) glass substrates from a solution of lead acetate and TeO₂ at low pH. A lead (Pb) strip was used as a sacrificing anode and the TCO glass acted as the cathode, which were short-circuited externally. Depositions were carried out at different temperatures of the bath to study the growth kinetics and grain growth. X-ray diffraction technique, scanning electron microscopy, infrared spectroscopy and resistivity measurements were carried out to characterize the deposited films. The films were polycrystalline in nature with a cubic phase.     

铅鼓风炉喷吹粉状燃料强化熔炼工业试验

采用从风口区喷粉状燃料来部份替代冶金焦,工业试验取得很好的技术经济指标。半焦与褐煤的混合物喷吹工艺转入工业化生产一年多来,生产技术经济指标稳定,劳动强度降低。5个多月生产统计指标显示,炉床能力提高10.44%,焦率下降15%,作业成本下降19.13%,置换比1.12,铅回收率97.34%。     

Effects of Weathering on Treatment of Lead Contaminated Soils

Treatment of lead-contaminated material focuses on the reduction of leached lead concentrations in laboratory leaching tests. There has been little study on the chemical stability of treated materials after waste disposal. To investigate the effects of weathering on several solidification/stabilization chemistries, lead-contaminated soil was treated with various agents (cement, phosphates, dithiocarbamate, calcium hydroxide, calcium carbonate, and metallic iron) and subjected to natural weathering for one year. Lead concentrations and pH values in field percolates and leachates from toxicity characteristic leaching procedure (TCLP) and water leaching tests were used to evaluate changes in the treatment effectiveness. Weathering altered the treatment chemistry of several additives—alkaline additives were neutralized, while reduced additives were oxidized. Lead concentrations in field percolates from the untreated soil were around 1.0?mg/L, and did not vary over one year of weathering time. After one year of weathering, lead concentrations in field percolates from most samples were reduced to low levels (<0.15 mg/L). Weathering also affected lead concentrations in the TCLP and water leach test leachates from the treated wastes. Treated wastes in which the alkaline additives were neutralized or reduced additives oxidized gave higher TCLP lead concentrations after weathering than before, in contrast to the decreasing lead concentrations in the field percolates. Water leaching tests on the alkaline treated wastes had lower lead concentrations after weathering than before.     

铅塔冷凝器的散热研究

分析了韶关冶炼厂锌精馏过程中铅塔冷凝器实际冷凝能力不足,冲顶事故时有发生的原因,并对二系统1#铅塔冷凝器散热进行了测试。测试结果表明:除顶部壁面处于良好的工作状况外,冷凝器各竖壁面的温度沿高度方向的变化显著,温差较大;在同一高度处,冷凝器北壁面温度明显高于东、西两侧壁面温度。     

Further study on different dopings into PbWO4 single crystals to increase the scintillation light yield

Since we presented our preliminary result (Nucl. Instr. and Meth. A 486 (2002) 170) at SCINT2001, we have continued our efforts to increase the light yield (LY) of PbWO₄ scintillators by extending different dopings with an aim to find a possibility of using PbWO₄ successfully in Positron Emission Tomography (PET). Overall result obtained for single doping as well as double and tripple co-dopings are summarized, including decay characteristics and radiation hardness. The LY in non-doped PbWO₄ crystals with a size of 10×10×(20–30) mm³ is 25–35 photolectrons/MeV (phe/MeV) corresponding to 3–4% of the LY in BGO, when measured with a bialkali photomultiplier during a gate of 1 μs. The maximum LY increased to 49 phe/MeV for single doping with Mo⁶⁺, 80 phe/MeV for double co-doping of Mo⁶⁺+Sb⁵⁺, and 85 phe/MeV for tripple co-doping of Mo⁶⁺+Cd²⁺+Sb⁵⁺. The radiation hardness is larger than 10⁵ Gy for each of the samples co-doped with Mo⁶⁺+Sb⁵⁺ and Mo⁶⁺+Cd²⁺+Sb⁵⁺, while it is much poorer in PWO:Mo⁶⁺. In each of these co-doped samples, a medium-speed green emission in the microsecond range is created besides the fundamental fast (a few nanoseconds range) blue one, giving a peak at 500 nm in the radioluminescence spectrum similarly as in PWO:Mo⁶⁺.     

铅冷快增殖堆物理和热工水力研究

对25MW电功率铅冷快增殖堆堆芯进行了物理和热工水力概算，并将计算结果与相同功率的钠冷快增殖堆的结果进行了分析比较。从初步概算的结果来看，铅冷快增殖堆是一种安全可行的快增殖堆堆型。     

500kV并联电抗器不拆引线预试方法探讨

介绍了500kV高压并联电抗器不拆引线预试的原理和方法，说明对高压电抗器进行不拆引线预试是可行的。     

水平铅蓄电池

本文介绍了一种全新设计,具有较高比能量,适用于电动车用的密封式铅蓄电池。     

降低高纯铅中的Cu、Bi、Sn等杂质含量

本文叙述了用电解精炼法在制备高纯铅过程中，降低铜、铋、锡杂质含量的各种措施和试验结果，比较详细地介绍了用硫化法降低电解液中的铜、铋、锡杂质的新工艺。     

铅纤维/聚氯乙烯复合材料隔声性能研究

为了有效隔断中、低波频率的噪声,按照一定的配方及其成型工艺,制备了一种超薄、轻量、柔韧的铅纤维/聚氯乙烯复合材料,分析研究了其隔声性能,并对其结构及抗噪声机理等进行了讨论.测试结果表明:这种材料对中、低频率的噪声的隔声量高达15dB以上.