聚硅酸硫酸铁絮凝剂的研制

用硫铁矿渣和硫酸铝渣制备了聚硅酸硫酸铁．研究了影响硅酸聚合的条件和nFe／nSi对聚硅酸硫酸铁稳定性的影响．用研制的聚硅酸硫酸铁絮凝剂处理模拟浊水，当nFe／nSi比为0．5时絮凝效果为最佳，用量达0.5ml／L后除浊率便可达90％以上；用nFe／nSi比为1．5的聚硅酸硫酸铁处理垃圾填埋场渗沥液，CODCr的去除率达60％．聚硅酸硫酸铁的特点是形成矾花的速度快，矾花实，沉降迅速．     

Post-treatment Study of Iron/Sulfur-containing Compounds in the Wreck of Lyon Saint-Georges 4 (Second Century ACE)

ABSTRACT

A pre-restoration diagnosis revealed a high amount of pyrite in the wood of the Lyon Saint-Georges 4 shipwreck (end of the second century). The occurrence of this phase is supposed to result from the microbiologically influenced corrosion of the iron fasteners. So, all the nails and metallic elements were removed from the remains before treatment and the wreck was consolidated by polyethylene glycol impregnation coupled to a specific desalination process. Treated and non-treated samples extracted from the wreck were studied in order to identify the iron/sulfur-containing compounds present in the wood before and after treatment and figure out its effect. Sample analyses relied on an original approach combining magnetic characterization methods and more common elemental and structural analysis methods. The results showed that the treatment was effective in removing soluble salts. However, a large amount of unstable iron sulfides remained inside the wood.     

陕西省白河县硫铁矿地质特征及成矿认识

本文综合论述了白河县硫铁矿的地质特征,分析了矿床形成的地质条件,认为该区域硫铁矿床为沉积矿床,严格受层位控制,并总结了找矿标志,认为矿区有着较大的成矿潜力。     

低品位铅锌尾矿浮选分离新工艺及新药剂研究

对某低品位铅锌尾矿进行了浮选分离试验研究,在自然pH条件下,以硫酸铜作活化剂,以丁基铵黑药与丁基黄药组合捕收铅锌矿物,采用BF-2作脱药剂,有机抑制剂BH-2与腐殖酸钠组合浮铅抑锌硫工艺,最终获得含锑40.23%、回收率74.09%的铅精矿和含锌30.50%、回收率为81.16%的锌精矿。     

Climatically Induced Degradation Processes in Conserved Archaeological Wood Studied by Time-lapse Photography

ABSTRACT

Samples of conserved archaeological wood of different ages, origins, and conservation histories were aged in a climate chamber for seven months, while the humidity alternated between 30% RH for 12 hours and 80% RH for 12 hours at a constant temperature of 30°C. Photographs were taken once every hour, which enabled the creation of a time-lapse movie. Some samples degraded visibly, whereas others were unaffected. Most of the samples were robust and would be able to survive well even in a very poor museum climate. Among the sensitive samples, three types of degradation were identified, namely disintegration, pyrite oxidation, and efflorescence of white crystals. Disintegration was ascribed to dimensional changes caused by the RH alternations in very fragile wood. The white efflorescence was interpreted as the recrystallization of an alum-associated substance, possibly mercallite (KHSO₄). The pyrite oxidation was observed as the efflorescence of a thick yellow, grey, and green powder. Characterization of selected samples was performed using X-ray fluorescence spectrometry, X-ray diffraction spectrometry, scanning electron microscopy with energy dispersive X-ray spectroscopy, inductively coupled plasma – optical emission spectroscopy, Fourier transform infrared spectroscopy, ionic conductivity – liquid chromatography, and pyrolysis-gas chromatography-mass spectrometry with in situ silylation using hexamethyldisilazane.     

黄铁矿型结构的微变化规律性

本文根据特征离子坐标变化的特点,对黄铁矿型结构的微变化规律性进行了讨论。作了一些关系图,总结出结构中的MX。八面体随u值增加而愈接近正八面体,X(M_3X)四面体则随u值增加更扁平,并得出:成分的变化控制着u值的变化,u值的变化影响着晶体结构的微变化。     

硫酸烧渣制备聚合磷硫酸铁及其对城市生活污水的处理效果

以硫酸烧渣为原料通过煅烧、酸浸、催化、氧化、水解、聚合得到聚合硫酸铁(PFS),并将自己制备的PFS加入到Na2HPO4溶液中,通过调节pH值,在适当的温度下,反应一段时间而得到聚合磷硫酸铁(PPFS)。采用制备的PPFS来处理城市生活污水,通过研究PPFS的用量对城市生活污水的浊度去除率和CODCr的处理效果的研究,确定了投加量。通过研究pH对处理效果的研究,确定了最佳pH值。处理效果显著。     

黄铁矿阳极氧化电化学机理的研究

利用LK98微机电化学分析系统，对黄铁矿在两种不同体系中的阳极氧化行为采用线性扫描伏安法研究，得到了黄铁矿阳极在氯化铁与氯化钠混合溶液、硫酸钠溶液中稳定电位范围为0．235～0．473V和0．30～0．7V，黄铁矿阳极溶解可能发生的反应是FeS2=Fe^2 2S 2e^-；FeS2=Fe^2 2S 3e^-．