金属阳离子对含金黄铁矿浮选的影响及消除方法的研究

矿浆中难免的金属离子Ｃｕ＾２＋、Ｆｅ＾２＋、Ｆｅ＾３＋在达到一定浓度时，会严重抑制含金黄铁矿的浮选。腐植酸钠可用来络合Ｃｕ＾２＋、Ｆｅ＾２＋、Ｆｅ＾３＋完全消除这些金属离子对含金黄铁矿浮选的影响。     

铁合金文摘THJ1558－1568

铁合金文摘ＴＨＪ１５５８－１５６８ＴＨＪ１５５８ＴＦ６１１ＴＦ６４１．１利用ＣａＯ＋ＣａＣｌ２＋Ｃｒ２Ｏ３熔剂进行合Ｃｒ铁熔体脱磷的热力学研究［ＡＴｈｅｒｍｏｄｙｎａｍｉｃＳｔｕｄｙｏｆＣａＯ＋ＣａＣｌ＋Ｃｒ２Ｏ３ＦｌｕｎｅｓｕｓｅｄｆｏｒｔｈｅＲｅ...     

掺稀土的LiMgAlF_6的合成与光谱特性

采用７３５℃高温固相反应，在高纯Ａｒ气保护下、配比为ＬｉＦ∶ＭｇＦ２∶ＡｌＦ３＝１２０∶１００∶１１０时合成了ＬｉＭｇＡｌＦ６。用Ｘ射线确定其结构为六方晶系。研究了ＬｉＭｇＡｌＦ６中掺Ｃｅ３＋、Ｅｕ３＋、Ｇｄ３＋和Ｔｂ３＋的光谱特性。发现Ｃｅ３＋对Ｔｂ３＋有明显的敏化作用。     

从高镁低锂卤水中萃取锂的机理研究

研究了ＳＫＳＥ混合萃取剂在高氯离子浓度和弱酸性条件下，以ＦｅＣｌ３为共萃取剂从高镁卤水中萃取锂的反应。测定了ＳＫ和ＳＥ的浓度对萃取的影响。用化学分析法、斜率法确定萃合物组成为ＬｉＦｅＣｌ４·ＳＫ·２ＳＥ；红外光谱分析认为在此体系中萃取锂为溶剂化萃取机理，ＳＫ中Ｃ＝Ｏ键和ＳＥ中Ｐ＝Ｏ、Ｃ－Ｏ键上的氧原子主要参与键合配位，其萃取反应方程式为Ｌｉ＋（ａ）＋ＦｅＣｌ－４（ａ）＋ＳＫ（ｏ）＋２ＳＥ（ｏ）＝（ＬｉＦｅＣｌ４·ＳＫ·２ＳＥ）（ｏ）     

WC—Fe／Ni／Co材料的物理力学性能和化学稳定性研究

本研究 对象为 粘结剂成 分 Ｆｅ ＋ Ｎｉ ＋ Ｃｏ ＝ １０ ％ 和 Ｆｅ ＋ Ｎｉ ＋ Ｃｏ ＝ ２０ ％ 的两 类 Ｗ Ｃ Ｆｅ／ Ｎｉ／ Ｃｏ 材料。研究了它 们的粘结 剂 合 金 化 元素 及 其 加 量 对 Ｗ Ｃ Ｆｅ／ Ｎｉ／ Ｃｏ 物 理 力学 性 能 和 化 学稳 定 性 的 影响。研究 表明，用合 适合金 成分的 Ｆｅ／ Ｎｉ／ Ｃｏ 粘结剂 采用“双 重晶粒结 构”湿磨 工艺能完 全取代 钴     

饱和氯化镁卤水中锂与金属络合阴离子共萃取效应的研究

研究了在饱和氯化镁盐湖卤水中，锂与各种络合阴离子的共萃取效应，结果表明，以ＦｅＣｌ３最佳。对锂与铁络合阴离子共萃取相关因素──总Ｃｌ－浓度、酸度、Ｆｅ／Ｌｉ进行了讨论，保持原始水相ＦｅＣｌ３不致水解的最低酸度和高Ｃｌ－浓度，ＦｅＣｌ３与Ｃｌ－形成铁络阴离子，与Ｌｉ＋以ＬｉＦｅＣｌ４络合物形式共萃取进入有机相。化学法分析平衡有机相组成表明，所有阳离子摩尔浓度的总值与Ｆｅ３＋摩尔浓度相等，而Ｃｌ－摩尔浓度与Ｆｅ３＋摩尔浓度比值为４，证明了以络酸ＨｆｅＣｌ４和络酸盐Ｍｅ（ＦｅＣ１４）ｎ（ｎ为金属阳离子价数）的共萃取机理。     

在氟盐体系中镧离子阴极过程的研究

采用循环伏安法研究了ＬａＦ＿３－ＬｉＦ二元熔体及添加Ｌａ＿２（ＣＯ＿３）＿３的ＬａＦ＿３～ＬｉＦ熔体中，９２０～９５０℃下，Ｌａ￣（３＋）在石墨电极上还原的阴极过程。结果表明：在ＬａＦ＿３－ＬｉＦ熔体中，电位在－０．８５Ｖ左右（相对于石墨参比电极），Ｌａ￣（３－）离子在阴极还原析出；在添加Ｌａ＿２（ＣＯ＿３）＿３，的ＬａＦ＿３－ＬｉＦ三元熔体中，Ｌａ（ＣＯ＿３）＿３，分解为Ｌａ＿２Ｏ＿３，Ｌａ＿２Ｏ＿３首先电解，然后ＬａＦ＿３电解，均在阴极上析出镧。镧离子的电化学反应是简单的一步反应，即Ｌａ￣（３＋）＋３ｅ→Ｌａ。     

用水平连铸生产铬轴承钢的试验

石横特殊钢厂采用ＥＢＴ＋ＬＦ冶炼、水平连铸浇铸工艺生产ＧＣｒ１５轴承钢。实践表明,采用ＥＢＴ＋ＬＦ＋ＨＣＣ工艺可以生产出质量符合ＹＢ９－６８要求的轴承钢,可实现一火成材,提高成材率,具有显著的效益。     

CaO—CaF2—SiO2渣系碳酸盐容量和硫化物容量的关系

根据文献报道１４７３－１７７３Ｋ的ＣａＯ－ＣａＦ２－ＳｉＯ２渣系碳酸盐容量和１４７３－１６２３Ｋ硫化物容量的数值，考查了ＸＣａＯ、ＸＣａＯ／ＸＳｉＯ２、ＸＣａＯ／（ＸＳｉＯ２＋ＸＣａＦ２）、（ＸＣａＯ＋ＸＣａＦ２）／ＸＳｉＯ２及光学碱度五种表达炉渣成分的参数与碳酸盐和硫化物容量的关系，研究了该渣系碳酸盐容理和硫化物容量的关系，结果表明：碳酸盐容量与ＸＣａＯ／ＸＳｉＯ２，（ＸＣａＯ＋ＸＣａＦ２）／Ｘ     

铁水预处理温度下CaO－SiO_2－FeO－P_2O_5－CaF_2渣系中Ca

对１３００℃和１３５０℃的铁水预处理温度下ＣａＯ－ＳｉＯ＿２－ＦｅＯ－Ｐ＿２Ｏ＿５－ＣａＦ＿２渣系中ＣａＯ饱和溶解量进行了测定。实验结果表明，温度升高对提高ＣａＯ饱和溶解量有利；渣中ＣａＦ＿２、ＦｅＯ含量增加，ＣａＯ饱和溶解量减少；当渣组成位于ＣａＯ＋Ｌ和Ｌ交界上时，与其它区域相比，ＣａＯ达到饱和所需溶解时间最短。     

Amiloride-insensitive Na+-H+ exchange: a candidate mediator of erythrocyte Na+-Li+ countertransport

Erythrocyte Na+-Li+ countertransport shows an increased activity in essential hypertension and diabetic nephropathy, but its nature remains unknown. This amiloride-insensitive membrane transport may not be a mode of operation of the amiloride-sensitive NHE1, the only Na+-H+ exchange isoform found in human erythrocytes. Whether an independent, although unknown, amiloride-insensitive isoform mediates Na+-Li+ countertransport is unclear. Na+-H+ exchange activity was measured in acid-loaded erythrocytes. Dimethylamiloride, a specific inhibitor of Na+-H+ exchange and phloretin, a known inhibitor of Na+-Li+ countertransport, gave a reduction in H+-driven Na+ influx (by 31 and 37%, respectively). This effect was additive, and a 66% reduction in H+-driven Na+ influx was found in the presence of both inhibitors. Internal acidification, a stimulus for Na+-H+ exchange, enhanced Na+-Li+ countertransport activity (from 287 +/- 55 to 1213 +/- 165 micromol x Lcell(-1) h(-1), mean +/- SEM, P = 0.003). This transport remained sensitive to phloretin under both conditions. Conversely, external acidification decreased Na+-Li+ countertransport activity (as expected for a Na+-H+ exchanger). Competition between internal H+ and Li+ or Na+ for a common binding site was present. Finally, similar kinetic parameters for external Na+ characterized Na+-Li+ countertransport and the phloretin-sensitive component of H+-driven Na+ influx. These findings suggest that both Na+-Li+ countertransport and the amiloride-insensitive, phloretin-sensitive component of H+-driven Na+ influx can be mediated by a previously unrecognized novel amiloride-insensitive Na+-H+ exchange isoform in human erythrocytes.     

某危废处置中心危废焚烧工艺分析及应用

以江西省吉安市某危废处置中心工程为例,阐述分析危险废物焚烧系统的工作原理和特性。该项目采用"斗提+油压推料+回转窑+二燃室+余热锅炉+急冷塔+干法脱酸塔+布袋除尘器+二级湿式洗涤塔+湿式电除尘+引风机+烟囱"的工艺。采用本工艺后,可实现危险废物的无害化、减容、减量,该工艺在国内外已广泛应用。     

Active potassium transport in reticulocytes of high-K+ and low-K+ sheep

The kinetics of active K+ transport were studied in immature red blood cells cells from high-K+ and low-K+ sheep particulary with respect to the effects of varying intracellular K+ concentration, [K]i. Comparison was made with active transport, or pump, activity in mature high-K+ and low-K+ red cells. Reticulocytes from both types of sheep had much higher maximal active K+ influxes than did mature cells. In both types of reticulocytes, and in mature high-K+ cells as well, the pump was relatively insensitive to increasing [K]i. In contrast, intracellular K+ markedly inhibited the pump in mature low-K+ cells. Active K+ transport in low-K+ reticulocytes, however, as in mature low-K+ cells, is stimulated by specific isoimmune anti-L serum. Therefore the K+ pumps of high-K+ and low-K+ reticulocytes have similar kinetic properties. Maturation of the red cells, involving inactivation of most of the pump activity in both cell types, results in mature high-K+ and low-K+ cells with K+ pumps of very different kinetic characteristics.     

分光光度法和光度滴定法联合测定湿法炼锌流程中钴渣浸出液中锌钴镍

湿法炼锌流程中钴渣浸出液中含有高浓度的Fe²⁺和Mn²⁺,用分光光度法测定Co²⁺和Ni²⁺时,Fe²⁺-EDTA会严重干扰Co²⁺和Ni²⁺的测定;在用光度滴定法测定Zn²⁺和Co²⁺合量时,Ni²⁺对二甲酚橙指示剂具有封闭作用,Mn²⁺亦与EDTA螯合,导致滴定结果偏高。为消除Fe²⁺和Mn²⁺对Zn²⁺、Co²⁺和Ni²⁺测定的干扰,实验进行氧化分离Fe²⁺和Mn²⁺预处理,在NaAc/Hac缓冲体系下,以EDTA作显色剂用分光光度法测定Co²⁺、Ni²⁺。在波长466nm处,Co²⁺的线性范围为50~500mg/L时与吸光度呈线性,相关系数R²为0.9992;在384nm处,Ni²⁺的线性范围为50~500mg/L时与吸光度呈线性,相关系数R²为0.9998。根据分光光度法测出Ni²⁺物质的量,加入1.1倍的丁二酮肟以除去Ni²⁺,用二甲酚橙为指示剂,EDTA鳌合-光度滴定法测定Zn²⁺、Co²⁺合量,扣减Co²⁺含量得出Zn²⁺含量。选取4个锌湿法炼锌流程中钴渣浸出液实际样品,按照实验方法中的分光光度法测定Co²⁺和Ni²⁺,光度滴定法测定Zn²⁺、Co²⁺合量,Zn²⁺、Co²⁺和Ni²⁺测定结果的相对标准偏差(RSD,n=6)均不大于0.70%,加标回收率分别为99.59%~100.41%、99.69%~100.64%、99.92%~100.08%。     

微分脉冲伏安法测定高铅氯盐溶液中锡

建立了高温氯盐法处理含铅锡物料时高铅氯盐溶液中锡的测定方法。研究发现, 在草酸-盐酸-亚甲基蓝的底液中, Sn在－0.5 V处有一灵敏的极谱波, Sn与Pb²⁺、Cd²⁺峰电位相隔100 mV, 可以利用微分脉冲伏安极谱法测定锡。对于0.25 mg/L的锡, 至少1 000倍的Cl^-、Na⁺、K⁺、F^-、SO^2-₄、NO^-₃, 200倍Cu²⁺、Fe³⁺、Zn²⁺、Al³⁺、Mn²⁺, 100倍Ca²⁺、Mg²⁺、Cr³⁺、Sb³⁺、Bi³⁺, 50倍Ni²⁺、Co²⁺, 30倍As³⁺、Pb²⁺、Cd²⁺不干扰测定。在选定试验条件下, 采用标准加入法对样品进行测定, 测定值相对标准偏差小于2%, 回收率在98.8%～104.2%之间。方法可应用于高铅氯盐溶液中锡的测定。     

Comparison of the efficacy and safety of tropisetron, metoclopramide, and chlorpromazine in the treatment of emesis associated with far advanced cancer

BACKGROUND: A single institution, prospective, randomized trial was performed in terminal cancer patients to compare tropisetron (TRO), metoclopramide (MET), and chlorpromazine (CHL) in the management of nausea and emesis. Patients had far advanced cancer, were far removed from chemotherapy or radiotherapy, and their nausea and emesis was not due to bowel obstruction, drug intake, or cranial, electrolytic, or metabolic causes. The effects of antiemetic treatments were evaluated from Days 1-15. METHODS: Two hundred and eighty patients were randomized to receive 1) MET+ dexamethasone (DEX) (10 mg*4 and 2 mg*1, respectively, orally), 2) TRO (5 mg*1, orally), 3) TRO + MET (5 mg*1 and 10 mg*2, respectively, orally), 4) TRO + MET + DEX (5 mg*1, 10 mg*2, and 2 mg*1, respectively, orally), 5) CHL + DEX (25 mg*2 and 2 mg*1, respectively, orally), 6) TRO + CHL (5 mg*1 and 12.5 mg*2, respectively, orally), or 7) TRO + CHL + DEX (5 mg*1, 12.5 mg*2, and 2 mg*1, respectively, orally). Total control was defined as no nausea or emesis. RESULTS: By the end of the 15th day, total control of emesis was obtained in 23.6% (9 of 38) of MET + DEX patients, 78.9% (30 of 38) of TRO patients, 84.2% (32 of 38) of TRO + MET patients, 92.3% (36 of 39) of TRO + MET + DEX patients, 33.3 (13 of 39) of CHL + DEX patients, 84.6% (33 of 39) of TRO + CHL patients, and 92.5% (37 of 40) of TRO + CHL + DEX patients. Total control of nausea was achieved in 18.4% (7 of 38) of MET + DEX patients, 65.7% (25 of 38) of TRO patients, 73.6% (28 of 38) of TRO + MET patients, 87.1% (34 of 39) of TRO + MET + DEX patients, 17.9% (7 of 39) of CHL + DEX patients, 74.3% (29 of 39) of TRO + CHL patients, and 85% (34 of 40) of TRO + CHL + DEX patients. When comparing MET + DEX versus TRO; MET + DEX versus TRO + MET; MET + DEX versus TRO + MET + DEX; MET + DEX versus TRO + CHL; MET + DEX versus TRO + CHL + DEX; CHL + DEX versus TRO; CHL + DEX versus TRO + MET; CHL + DEX versus TRO + MET + DEX; CHL + DEX versus TRO + CHL; and CHL + DEX versus TRO + CHL + DEX, significant differences were noted. All antiemetic drugs were well tolerated with no severe side effects observed in any treatment arm. CONCLUSIONS: These data suggest that 5-HT3 receptor antagonists such as tropisetron clinically are more effective in the control of emesis of patients with far advanced cancer than previously used agents. This study raises important issues when attempting to decide which antiemetic therapy to choose for an individual patient with far advanced disease.     

含磷酸根离子和三价铁离子的溶液中镓的沉淀行为研究

研究了磷酸根离子对镓离子和三价铁离子沉淀过程的影响以及在含磷酸根离子的溶液中三价铁离子对镓离子沉淀过程的影响。实验结果表明磷酸根离子能促进镓离子和三价铁离子的沉淀,其沉淀率都随磷酸根离子浓度的增加而增加,直至磷酸根离子与待沉淀的金属离子摩尔比达到1∶1,进一步提高磷酸根离子浓度,镓离子和铁离子沉淀率几乎不变。在相同的磷酸根离子浓度和pH下,三价铁离子比镓离子容易沉淀。在含磷酸根的溶液中,三价铁离子对镓离子的沉淀过程具有促进作用,并且镓的沉淀率随Fe3+/Ga3+摩尔比的增加而增加,Fe3+/Ga3+摩尔比从0增加至5∶1时,镓完全沉淀所要求的pH从3.5降低到3.0。采用共沉淀法可以在较低的pH下比较完全地从溶液中回收镓。     

Differential effects of extracellular Mg2+ on thrombin-induced and capacitative Ca2+ entry in human coronary arterial endothelial cells

Receptor-mediated and capacitative Ca2+ entry are the primary Ca2+ entry pathways in endothelial cells (ECs). The mechanisms for Ca2+ entry via these pathways have not been fully elucidated. In this study, the effect of low and high external Mg2+ concentrations on these Ca2+ entry pathways was examined in human coronary arterial ECs. External Mg2+ concentration did not affect cytosolic free Mg2+ concentration. After exposure to thrombin in Ca(2+)-free medium, addition of Ca2+ to the medium caused a rise in cytosolic free Ca2+ concentration ([Ca2+]i), indicating thrombin-induced Ca2+ influx. Thrombin-induced Ca2+ influx was inhibited by not only low but also high external Mg2+ concentrations. After depletion of endoplasmic Ca2+ stores by thapsigargin, addition of Ca2+ to the medium induced an increase in [Ca2+]i, indicating capacitative Ca2+ entry. Capacitative entry was found to be accelerated by low external Mg2+ and inhibited by high external Mg2+ concentration. Results suggest that receptor-mediated Ca2+ influx requires external Mg2+ but is inhibited by increased external Mg2+ concentrations and that capacitative Ca2+ entry is reduced by external Mg2+ in human coronary arterial ECs.     

石煤钠化焙烧物中不同价态钒的测定

石煤钠化焙烧物中含有V3+、V4+、V5+、Fe2+、Fe3+、SiO2等多种组分。研究了石煤钠化焙烧物中V5+、V4+的碱浸分离,以及V3+、V4+、Fe2+、Fe3+、SiO2在磷酸-氢氟酸介质中的溶解和干扰组分的消除,获得了满意结果。     

Study on Separation of Lanthanum from Praseodymium Complexes with IMDA by Gel and Macroporous Anion Exchangers

Ｍａｎｙｓｔｕｄｉｅｓｈａｖｅｂｅｅｎｍａｄｅｏｎｔｈｅｓｅｐａｒａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓｕｓｉｎｇｓｏｌｖｅｎｔｅｘｔｒａｃｔｉｏｎａｎｄｉｏｎｅｘｃｈａｎｇｅ[1].Ｓｉｎｃｅｔｈｅａｆｆｉｎｉｔｙｓｅｒｉｅｓｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓｆｏｒｃａｔｉｏｎ-ｅｘｃｈａｎｇｅｒｓａｒｅｖｅｒｙｓｉｍｉｌａｒ,ａｓｅｐａｒａｔｉｏｎｂｙｅｌｕｔｉｏｎｗｉｔｈｉｎｏｒｇａｎｉｃａｃｉｄｓｉｓａｌｍｏｓｔｉｍｐｏｓｓｉｂｌｅ.Ｈｏｗｅｖｅｒ,ｇｏｏｄｒｅｓｕｌｔｓｃａｎｂｅ…