二烷基硫化磷酸铵的捕收性能

本文研究了二烷基硫代磷酸铵（ＲＯ）２ＰＳＯＮＨ４（Ｒ＝乙基、丁基、己基、烷丙烯）系列捕收剂对非硫化矿孔雀石，赤铁矿，白铅矿，方解石和菱锌矿的浮选性能，并就药剂结构与性能关系进行了分析讨论。     

t－BAMBP萃取铷、铯反应机理及热力学函数研究

研究了ｔ－ＢＡＭＢＰ（简称ＲＯＨ）从碱性水相中萃取铷、铯的机理。以斜率法、饱和法测定萃合物组成为ＭＯＲ·３ＲＯＨ（Ｍ表示Ｒｂ￣＋、Ｃｓ￣＋）。ＲＯＨ萃取铷、铯为阳离子交换机理，萃取方程式为＋２（ＲＯＨ）＿２（ＭＯＲ·３ＲＯＨ）。由温度效应按ｌｇＤ－Ｔ￣（－１）的直线斜率，求得萃取热焓△Ｈ，由△Ｈ和表观萃取平衡常数Ｋ便可计算自由能△Ｇ和熵变△Ｓ。萃取铷、铯的过程是一个放热反应     

石油亚砜和P_（507）协同萃取稀土元素的研究

本文在盐酸介质中研究了石油亚砜和Ｐ（５０７）协同萃取稀土元素（Ｇｄ、Ｔｂ、Ｄｙ）的性能与机理，得出石油亚砜和Ｐ（５０７）协同萃取稀土元素Ｇｄ、Ｔｂ、Ｄｙ时有正协同效应，三者在体积比Ｖ（Ｐ（５０７））（０．５ｍｏｌ／Ｌ）／Ｖ（Ｒ２ＳＯ（１．４５ｍｏｌ／Ｌ）＝２／３时协同效应最明显；用斜率法确定萃合物的组成为ＲＥ（Ｒ２ＳＯ）２Ｐ（５０７）；研究了萃合物红外光谱图；测定了稀土的分配系数和分离系数；建立了稀土元素分配系数数学模型。     

N,N—二辛基甘氨酸萃取锗的机理

报道了Ｎ，Ｎ－二基甘氨酸从盐酸体系中萃取铑的机理，结果表明，锗的萃取率随酸度、氯离子浓度、铑离子浓度的增大而降低，采用法测得萃合物组成为：Ｒ２ＨＣＨ２ＣＯＯＨ．ＨＲｈ（Ｈ２Ｏ）２Ｃｌ４．萃取反应方程式为：Ｒ２ＮＣＨ２ＣＯＯＨ．ＨＣｌ（Ｏ）＋Ｒｈ（Ｈ２Ｏ）２Ｃｌ４（Ａ）＝Ｒ２ＮＣＨ２（ＣＯＯＨ．ＨＲｈ（Ｈ２Ｏ）２Ｃｌ４（Ｏ）＋Ｃｌ（Ａ）。     

COREX革命——低成本钢铁生产新概念

ＣＯＲＥＸ法是唯一在工业上被证明了可在世界范围内取代传统高炉路线生产铁水的方法，本文从工艺过程出发，简单介绍了南非ＩＳＣＯＲ（伊斯科尔公司）的运行情况，重点介绍了韩国ＰＯＳＣＯ（浦项公司），印度ＪＩＮＤＡＬ（金达尔公司）和韩国ＨＡＮＢＯ（韩宝公司）目前正在实施的ＣＯＲＥＸ项目精华部分，尤其就ＶＡＩ（奥钢联）提出了“联合紧凑型钢厂”概念中ＣＯＲＥＸ组合方式，对ＣＯＲＥＸ法的实用性和可行性进行了探讨。     

REBO3基质中Sm^3＋的阴极射线发光特性

ＲＥＢＯ＿３基质中Ｓｍ￣（３＋）的阴极射线发光特性郭凤瑜彭夷安（北京大学１００８７１）（湖南医学专科学校）ＲＥＢＯ＿３（ＲＢ＝Ｌａ、Ｇｄ、Ｙ）是一类优良的发光材料的基质。对于ＲＥＢＯ＿３中稀土离子（如Ｃｅ￣（３＋）、Ｐｒ￣（３＋）、Ｓｍ￣（３＋）、Ｅ...     

利用ROC技术制备TiNi形状记忆合金的研究

利用快速全向压制（ＲＯＣ）技术直接由钛、镍元素粉末制备了ＴｉＮｉ形状记忆合金。利用密度测试、显微组织观察、Ｘ射线衍射分析以及性能测试等手段对影响ＴｉＮｉ合金制备过程的主要影响因素进行了分析研究,并对制备的ＴｉＮｉ合金进行了热轧、冷轧等加工性能试验。利用ＲＯＣ技术可以得到反应充分、结构密实并具有良好性能的ＴｉＮｉ形状记忆合金。     

国外冶金材料标准化组织和机构简介(二)

３奥地利（Ａｕｓｔｒｉａ）标准化学会（ＯＮ）成立于１９２０年,负责制定和发布奥地利标准,同时也向国内推荐使用国外标准。范例：ＯＮＯＲＭＭ３４３０;ＯＮＯＲＭＭ３４２９;ＯＮＯＲＭＭ３４２５ＡＩ９９．９８４比利时（Ｂｅｌｇｉｕｍ）标准化学会（ＩＢＮ）创...     

RECl_3与Gly间配合行为的半微量相平衡研究

测定了ＲＥＣｌ_３－Ｇｌｙ－Ｈ２_Ｏ（ＲＥ＝Ｓｍ，Ｄｙ，Ｙｂ）三元体系在２５℃时的溶度和饱和溶液折光率，绘制了相应的溶度图和饱和溶液折光率曲线。各体系的溶度曲线与折光率曲线均由四支组成，分别与ＲＥＣｌ_３·６Ｈ_２Ｏ，ＲＥ（Ｇｌｙ）Ｃｌ_３，２Ｈ_２Ｏ，ＲＥ（Ｇｌｙ）_３Ｃｌ_３·３Ｈ_２Ｏ和Ｇｌｙ相对应。制备了５个未见文献报道的化合物：ＲＥ（Ｇｌｙ）_３Ｃｌ_３·３Ｈ_２Ｏ（ＲＥ＝Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｄｙ），并用化学分析、元素分析、ＩＲ、ＦＳ、Ｘ－粉末衍射和ＴＧ－ＤＴＧ对其进行了表征。     

溶剂萃取分离铟和镓

溶剂萃取分离铟和镓日本专利０４４８０３８号，用一种化学式为（Ｒ＿１Ｏ）·（Ｒ＿２Ｏ）Ｐ（：Ｏ）（ＯＨ）（Ⅱ）［这里的Ｒ＿１，Ｒ＿２＝ＣＨ＿２ＣＨ（Ｃ＿ｍＨ＿（２ｎ＋１）），ｍ为４以上的整数，ｍ＋ｎ是８～１０的整数］的二烃基磷酸溶液从含Ｉｎ￣（３＋），...     

铁矿石中硫化铁的分离方法研究

本文研究了有机酸在化学物相分析中的应用问题.通过对其酸效应影响的探讨,证明CH_8COOH-CH_8COONa—H_2O_2溶液(pH～4.5)是硫化铁矿物有效的选择性溶剂.其主要特点是共存的铁绿泥石、铁橄榄石等易溶性硅酸铁矿物均不干扰.方法用于铁矿石中硫化铁的分离测定,结果比较满意.     

Synthesis and Characterizations of Rare Earth Compounds RE(HCO 2) 3(HNO 2)(H 2CO 2)(RE=Y, Tb, Dy, Ho, Er, Yb, Tm)

Ｎｏｎｌｉｎｅａｒｏｐｔｉｃａｌｍａｔｅｒｉａｌｓｈａｖｅｂｅｅｎａｔｔｒａｃｔｅｄｍａｎｙｍａｔｅｒｉａｌｓｓｃｉｅｎｔｉｓｔｓａｎｄｃｈｅｍｉｓｔｓｆｏｒｔｈｅｉｒｉｍｐｏｒｔａｎｔｒｏｔｅｉｎｍｏｄｅｒｎｌａｓｅｒｔｅｃｈｎｏｌｏｇｙ．Ａ...     

Negative ion postsource decay time-of-flight mass spectrometry of peptides containing acidic amino acid residues

Acidic peptides have been studied by negative ion postsource decay (PSD) matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. The peptides contained from 5 to 16 residues and were chosen on the basis of their patterns of the acidic residues. Using typical MALDI sample preparation techniques employing an acidic matrix, gastrin I (1-14), and epidermal mitosis inhibiting pentapeptide yielded much larger deprotonated ion signals, [M - H]-, than protonated ions, [M + H]+. This may be due to their absence of basic residues, coupled with their arrays of acidic residues. The PSD fragmentation of the peptide negative ions showed that an array of acidic residues, as in gastrin I (1-14), yielded simple spectra containing mainly backbone cleavage ions from the C-terminus. Hirudin (54-65), which contains two sets of two consecutive Glu residues, and fibrinopeptide A and fibrinopeptide B, with isolated acidic residues, also showed backbone cleavages as common fragment ions. In addition, the two sets of isolated consecutive amino acid residues in Cys(Bzl)84-CD4 (81-92) and hirudin (54-56) yielded internal ions from the cleavages at the (O=C)-NH bond between the acidic residues. Also observed were ions with unique side chain losses, such as the loss of C6H4O from a tyrosine residue and SCH2C6H5 and CH2C6H5 from a benzylated cysteine residue. Compared to the positive mode, the negative-ion PSD yielded fewer fragments which usually involved only one type of backbone cleavage (e.g., [Yn - H2O]-). These simple spectra aided interpretation. Overall, the acidic peptides studied yielded negative ion PSD spectra that were useful for peptide sequencing.     

Phase equilibria in the metal-sulfur-oxygen system and selective reduction of metal oxides and sulfides: Part I. The carbothermic reduction and calcination of complex mineral sulfides

The difference in the standard Gibbs free energy for the formation of any two oxides or sulfides is the chemical potential for selective reduction of metals from complex minerals. The magnitude of the Gibbs free energy difference is shown by plotting the univariant relationships for relevant sulfides and oxides. In this investigation, three examples of mineral sulfides are considered, and the experimental results are compared with the predicted thermodynamic calculations. These examples include the reduction conditions for nickel and iron sulfides and pentlandite (Fe,Ni)₉S₈ and chalcopyrite (CuFeS₂) minerals. The reduction behavior of mineral sulfides, such as those of nickel, cobalt, iron, and copper, is illustrated by referring to both the sulfide and alloy phase equilibria. In particular, the solution thermodynamic properties of the metallic phase equilibria are featured for determining the physical chemistry of preferential or selective reduction of the metal oxides and sulfides. The mechanism for the reduction of the aforementioned sulfide minerals is explained with the aid of the governing phase equilibria for the calcination process. The results from the carbothermic reduction of sulfide minerals are also compared. The important roles of lime and calcium sulfate in controlling the emission of sulfurous gases during the reduction reaction are explained. A qualitative analysis of reduction reactions of nickel and iron sulfides is reviewed to provide a comparison of the mechanism for complex nickel-bearing minerals. The importance of these results in producing alloy and pure metallic phases is also examined.     

Cis-Dichloro(diaminosuccinate diethyl ester)palladium (II) as Pd(II)/Pt(II) model compound for DNA-binding and antitumor properties: solution equilibria of their aqua-, hydroxo-, and/or chloro-species

Cis-Dichloro(diaminosuccinic acid)palladium(II), cis-[Pd(H2dasa)Cl2] (I), or cis-dichloro(diaminosuccinate diethyl ester)palladium(II), cis-[Pd(Et2dasa)Cl2] (II) reacts with two equivalents of AgClO4 to give insoluble Pd(dasa) or an aqueous solution of [Pd(Et2dasa) (H2O)2](ClO4)2, respectively. Three solutions of this salt were titrated with NaOH (I = NaClO4 (0.15M),37 degrees C), and 133 E(H+) data (3.5 < or = pH < or = 7) were treated by SUPERQUAD to fit log beta pqr of cis-aquahydroxo-(pqr = 10-1, -5.25(3)) and di-mu-hydroxo-species (20-2, -6.55(1)). At pH > 7 the ester hydrolysis prevents the calculation of log beta 10-2 for the cis-dihydroxo-complex. Another three solutions of such salt were titrated (I = 0.15M (NaClO4), 37 degrees C) with NaOH and NaCl simultaneously using two potentiometric systems (which measure H+ or Cl-). From 147 E(H+) and E(Cl-) data pairs and the above fixed log beta pqr, SUPERQUAD calculations yield log beta pqr for cis-chloro-aqua (pqr = 110, 3.65(1)), cis-chloro-hydroxo (11-1, -2.68 (4)), and cis-dichloro-species (120, 5.86(3)). Simulated and experimental titrations are in good agreement. Circular dichroism spectra of native DNA and drug:DNA complexes suggest that cis-Pd(H2dasa) and cis-Pd(Et2dasa) chelate moieties induce an opening and rotation of the stacked bases in the double helix. This finding is explained by the abundance of each one and of the total neutral and charged species of II in the tested CD solution.     

无金属粘结相硬质合金的电化学腐蚀行为

采用1 700℃、20 MPa高温高压固相烧结工艺制备WC-0.5Cr3C2-0.3VC、WC-3.65TiC-2.45TaC-0.47Cr3C2-0.28VC和WC-6Mo2C-0.47Cr3C2-0.28VC等3种无金属粘结相硬质合金。采用CHI 660C电化学工作站研究在pH=1的H2SO4溶液、pH=7的Na2SO4溶液和pH=13的NaOH溶液中3种合金的电化学腐蚀行为。结果表明,在pH=1的H2SO4溶液和pH=7的Na2SO4溶液中WC-6Mo2C-0.47Cr3C2-0.28VC合金的耐腐蚀性能最好,在pH=13的NaOH溶液中WC-3.65TiC-2.45TaC-0.47Cr3C2-0.28VC的耐腐蚀性能最好。3种无金属粘结相硬质合金在pH=13的NaOH溶液中的耐腐蚀性能均优于其在pH=1的H2SO4溶液中的耐腐蚀性能。综合比较合金的硬度、耐腐蚀性能以及原材料价格,3种合金中WC-6Mo2C-0.47Cr3C2-0.28VC合金具有更佳的性价比。     

固液界面反应法制备针状草酸钴粉体

以钴粉和草酸(H2C2O4)为原料,采用固液界面反应法制备针状草酸钴(Co2C2O4·2H2O)粉体.用扫描电镜(SEM)、X射线衍射仪(XRD)和激光粒度仪对粉体进行表征,研究反应温度、钴粉浓度、草酸与钴粉的计量比以及无机酸的种类和用量对草酸钴粉体的形貌和长径比的影响.结果表明,反应温度为30℃时草酸钴粉体多为颗粒状...     

Anti-inflammatory drugs interacting with Zn(II), Cd(II) and Pt(II) metal ions

Complexes of Zn(II), Cd(II) and Pt(II) metal ions with the anti-inflammatory drugs, 1-methyl-5-(p-toluoyl)-1H-pyrrole-2-acetic acid (Tolmetin), alpha-methyl-4-(2-methylpropyl)benzeneacetic acid (Ibuprofen), 6-methoxy-alpha-methylnaphthalene-2-acetic acid (Naproxen) and 1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indole-3-acetic acid (indomethacin) have been synthesized and characterized. In the structurally characterized Cd(naproxen)2 complex the anti-inflammatory drugs acts as bidentate chelate ligand coordinatively bound to metal ions through the deprotonated carboxylate group. Crystal data for 1: [C32H26O8Cd], orthorhombic, space group P22(1)2(1), a = 5.693(2) (A), b = 8.760(3) (A), c = 30.74(1) (A), V = 1533(1) A3, Z = 2. Antibacterial and growth inhibitory activity is higher than that of the parent ligands or the platinum(II) diamine compounds.     

Relationships between plasma levels of type-II phospholipase A2, PAF-acetylhydrolase, leukotriene B4, complements, endothelin-1, and thrombomodulin in patients with sepsis

We determined the plasma levels of type-II phospholipase A2 (type II PLA2), platelet-activating factor acetylhydrolase (PAFAH) leukotriene B4 (LTB4) and of several complements (C3a, C4a, and C5a), which are considered to be among the cytokines and eicosanoids involved in vascular endothelial disorders and that vary in concentration during sepsis. We investigated the relationship between those levels and those of ET-1 and TM levels in plasma. Plasma levels of type II PLA2, PAFAH, LTB4, C3a, C4a, ET-1, and TM at the time that sepsis was diagnosed in 30 patients were 218.3 +/- 179.9 ng/ml, 23.92 +/- 9.66 nmol/min/ml, 90.35 +/- 31.49 pg/ml, 838.73 +/- 2.30 pg/ml, 1951.46 +/- 1697.78 pg/ml, 6.98 +/- 4.08 pg/ml and 7.80 +/- 3.34 ng/ml, respectively. The C5a plasma level was below the limit of detection in all cases. There were significant correlations between type II PLA2 and ET-1 plasma levels (r = 0.39, p = 0.032) and C3a and ET-1 plasma levels (r = 0.60, p = 0.03). There were also significant correlations between type II PLA2 and TM levels in plasma (r = 0.76, p = 0.0017), PAFAH and TM plasma levels (r = 0.53, p = 0.037), LTB4 and TM plasma levels (r = 0.46, p = 0.016) and C4a and TM plasma levels (r = 0.58, p = 0.037). Results suggest that the elevation of type II PLA2, PAFAH, LTB4 and complement in plasma is involved in vascular endothelial disorders in patients with sepsis.     

Effect of Mechanical Activation on Pressure Leaching of Küre Massive Rich Copper Ore

The effect of mechanical activation on metal dissolutions by pressure leaching of massive rich copper ore taken from Küre copper ore deposit (Turkey) was investigated. The dissolution efficiencies of sulfide minerals are significantly improved by ultrafine grinding, also known as mechanical activation. This grinding results in decrease of particle size and an increase in crystal distortion of sulfide minerals. Leaching efficiencies of copper, cobalt, and Zinc increased from 45.2%, 25.9%, and 87.7% to 98%, 85%, and 97%, respectively, after 3-h mechanical activation. At the end of the activation, leaching was carried out at a temperature of 110°C, 10-bar oxygen partial pressure, and 150-g/L solid concentration without addition of acid. This study has also indicated that mechanical activation involving fine milling as a pretreatment is not only effective on copper minerals dissolution but also on the dissolution of other associated minerals, such as cobalt and zinc sulfides.