超滤前处理分光光度法测定含黄腐酸尿素中缩二脲

用超滤膜前处理样品,将含黄腐酸尿素分成两部分,黄腐酸截留在超滤杯中,收集透过超滤膜的尿素和缩二脲的混合溶液。利用缩二脲在硫酸铜、酒石酸钾钠的碱性溶液中生成紫色配合物,用分光光度法在550nm波长处测定其吸光度。     

钢铁厂含锌尘泥转底炉炼铁工艺设计研究

因为环保和市场的需要,转底炉处理钢铁厂含铁尘泥及废弃物技术正在国内呈现出蓬勃的生命力。目前,国内已有多条转底炉直接还原生产线投入运行,转底炉技术能直接利用废弃粉尘中的碳还原氧化铁和氧化锌,金属化率达到70%,脱锌率达到80%,有效的解决了钢铁企业含锌粉尘的回收和利用。     

HPLC测定醋酸氯己定碘醇溶液中醋酸氯己定的含量

目的建立高效液相色谱法(HPLC)测定醋酸氯己定碘醇溶液中醋酸氯己定的含量测定方法。方法用C18柱为固定相,以甲醇-水-三乙胺(65:35:0.3,含0.01 mol/L庚烷磺酸钠,用磷酸调节pH 4.0)为流动相,检测波长259 nm。结果醋酸氯己定进样量在0.1035~0.3622μg范围内呈良好的线性关系,r为0.9999(n=6),平均回收率99.8%(n=9)。方法的检测限0.012 94μg,定量限0.025 87μg。结论此法可靠、准确、专属性强。     

含钪Al-Cu-Li-Zr合金的剥蚀性能及电化学阻抗谱

采用剥落腐蚀(Exfoliation corrosion,EXCO)实验和电化学阻抗测试方法,研究时效对新型含钪Al-Cu-Li-Zr合金剥蚀性能的影响。结果表明:合金在EXCO溶液中剥落腐蚀敏感性由高到低的顺序为过时效,峰时效,欠时效;合金在EXCO溶液中浸泡初期,其电化学阻抗谱由一个高频容抗弧和低频感抗弧组成,且随浸泡时间的延长,低频感抗部分逐渐减弱直至消失;一旦发生剥蚀,合金的电化学阻抗谱出现两个部分重叠的容抗弧。依据腐蚀特征和电化学原理设计了等效电路图,对合金腐蚀发展过程的电化学阻抗谱进行了拟合,拟合数据和实验结果一致。     

利用高硅低品位磷矿生产过磷酸钙的工艺技术

对高硅低品位磷矿生产过磷酸钙工艺的开发情况进行了总结。试生产表明：云南华宁磷矿粉含硅高,活性差,只能采用箱式化成法,延长化成时间,用高温高浓混合反应条件才能生产出合格品过磷酸钙。     

自修复涂料的研制

本文研制的自修复涂料系统含有许多特点,硅氧烷单体自修复剂HOPDMA-PDES按相分离分散在介质中,而同时催化剂在微胶束中,HOPDMA与PDES不会发生反应,只有当催化剂从微胶束中破壳而出与自修复剂完全混合并固化后,自修复剂才完成任务。     

混合硫酸盐还原菌群还原Cr(Ⅵ)的初步研究

利用驯化后的耐受Cr(Ⅵ)的混合硫酸盐还原菌群处理含Cr(Ⅵ)废水,探讨了pH值、培养温度等对Cr(Ⅵ)去除率的影响。结果表明,当Cr(Ⅵ)浓度为50 mg·L-1、pH值为7.0、培养温度为36℃、培养时间为36 h时,该混合菌群对Cr(Ⅵ)的去除率达到最高,为97.6％。该混合菌群能适应较宽的pH值和温度范围且处理...     

ZVI-SRB协同处理铀废水的正交实验研究

在缺氧的环境下,利用零价铁(ZVI)和硫酸盐还原菌(SRB)协同处理含铀废水,通过正交实验考了察初始pH,铀的初始浓度,SO42-,NO3-对ZVI-SRB协同处理含铀废水的影响.结果表明,铀的初始浓度对ZVI-SRB协同处理铀废水的影响最大,其次是NO3-,pH值,SO42-;在500mL的水样中,其最佳的还原条件是:pH为5,SO42-为3000mg/L,NO3-为400mg/L,铀的初始浓度为160mg/L;在最佳还原条件下,铀的去除率为93.49%.     

超重力技术在气体净化中的应用

超重力技术是一种过程强化的新型技术,在环保、化工等工业领域有着广阔的应用前景。本文介绍了该项新技术的作用原理和特点及其在多种气体净化过程中的应用。     

Promising components of waste-derived slurry fuels

The paper presents the results of experimental studies of energy (calorific value, ignition delay times and threshold ignition temperatures, duration and temperature of combustion) and environmental (CO₂, NO_x and SO_x emission) characteristics of fuel slurries based on pulverized wood (sawdust), agricultural (straw), and household (cardboard) waste. Wastewater from a sewage treatment plant served as a liquid medium for fuels. Petrochemical waste and heavy oil were additives to slurries. The focus is on obtaining the maximum efficiency ratio of slurry fuel, calculated taking into account environmental, cost, energy and fire safety parameters. All slurry fuels were compared with typical coal-water slurry for all the parameters studied. A comparison was also made between slurries and traditional boiler fuels (coal, fuel oil). The relative efficiency indicator for waste-based mixtures was varied in the range of 0.93–10.92. The lowest ignition costs can be expected when burning a mixture based on straw, cardboard and oil additive (ignition temperature is about 330 °C). The volumes of potential energy generated with the active involvement of industrial waste instead of traditional coal and oil combustion are forecasted. It is predicted that with the widespread use of waste-derived slurries, about 43% of coal and oil can be saved.