蛇纹石中微量钯的提炼

介绍了蛇纹石的熔融，酸解等处理过程，重点叙述了从蛇纹石中提取微量贵金属钯的工艺流程和操作方法。钯的提取率为９０．５％。     

蛇纹石中微量钯的提炼

介绍了蛇纹石的熔融、酸解等处理过程 ,重点叙述了从蛇纹石中提取微量贵金属钯的工艺流程和操作方法。钯的提取率为 90 .5 %。     

乳状液膜萃取钯的研究

本文以液膜法从盐酸介质中萃取钯为目的,对萃取中影响萃取率和萃取速率的多种因素如搅拌速率、内解析剂、水相中钯浓度、膜中TNOA的浓度及水乳比等展开了研究。     

钯的二苄基硫醚固相萃取分离研究

基于二苄基硫醚与钯的配合反应,建立了一种高选择性固相萃取吸附钯的方法。在0.1 mol/L的盐酸介质中,钯可以被二苄基硫醚树脂吸附富集并形成1∶2稳定配合物,该配合物可用20 g/L酸性硫脲洗脱,洗脱液经处理后用分光光度法测定,柱可以再生和重复使用,且萃取剂流失少。二苄基硫醚对钯的吸附是配位萃取机理;方法用于吸附分离钯选择性高,钯的回收率达95%以上。     

萃取还原重量法测铂钯物料中的金

用王水分解试样，盐酸煮沸脱硝，水稀释沉淀银。在２～４ｍｏｌ／Ｌ ＨＣｌ介质中，用２０ｍＬ／ｇＡｕ甲基异丁基甲酮两次萃取金，草酸－氢氧化钠反萃取还原金。金泥经净化、洗涤、烘干后，于８００℃灼烧至恒重。回收率达９９．９３％。     

从蛇纹石尾矿中制取轻质氧化镁的研究

从蛇纹石尾矿中制取轻质氧化镁的研究封惠侠（河南省信阳教育学院化学系信阳４６４０００）我国有丰富的蛇纹石矿产资源，贮量超过五亿吨。目前年开采量约２００～３００万吨／年，主要作为钙、镁、磷肥的原料。在开采过程中，产生大量的蛇纹石碎石，本文称之为尾矿，约占...     

废钯催化剂中钯的回收

介绍了分别从废Pd /Al2 O3、Pd/C、Pd/Cu催化剂中回收钯的各种方法 ,并对其优劣性进行了分析。     

Pd~(2+)-I~--TBAB三元缔合物萃取光度法测定钯含量

介绍了Ｐｄ２＋－Ｉ－－ＴＢＡＢ（四丁基溴化铵）三元缔合物萃取光度法测定钯的方法。该方法以Ｌ（＋）抗坏血酸作为掩蔽剂，干扰离子Ｃｕ２＋，Ｆｅ３＋的允许量均为２．５μｇ／ｍＬ，Ｐｄ２＋浓度为０～４μｇ／ｍＬ，完全符合比耳定律（萃取剂作参比），方法的相关摩尔吸光系数ε为２．０９×１０４Ｌ／（ｍｏｌ·ｃｍ），桑德尔灵敏度Ｓ为５．０７×１０－３μｇ／ｃｍ２。工作曲线的应用范围为１～４μｇ／ｍＬ。     

信阳蛇纹石矿资源调查

对信阳地区蛇纹石矿资源的分布状况、储量、特征、组成和开采应用情况等进行了简要介绍,同时对它的未来开发方向提出了一些建议。     

蛇纹岩开发与综合利用

蛇纹岩（除蛇纹玉外）应用时主要加工方法有物理加工、热法（焙烧法）、湿法（酸解法）3种。中国从20世纪90年代开始开发研究蛇纹岩各种应用,不完全统计有关论文575篇,发明专利27项。蛇纹岩的研究领域在拓宽,应用范围在扩大,从农业到医药,耐火材料、建材到化工材料,金属镁和镁化合物、单晶硅到硅化合物系列产品,环保产品到玉石产品,均在快速发展。蛇纹岩将具有更好的开发前景和更高的利用价值。     

从蛇纹石中提取回收镍的实验研究

为了探讨蛇纹石中镍的浸取与富集的有效方法,进行了蛇纹石浸出液浸取条件选择及浸出液的净化与铁镍混合物的回收试验.结果表明:采用盐酸浸出工艺,镍浸出率为96.47%,浸出液经净化沉镍,可得含镍1.48%的铁镍混合物,达到了工业品位要求,镍的回收率为83.77%.     

Flow and heat transfer in serpentine channels

Serpentine channels are often used in microchannel reactors and heat exchangers. These channels offer better mixing, higher heat and mass‐transfer coefficients than straight channels. In the present work, flow and heat transfer experiments were carried out with a serpentine channel plate comprising of 10 units (single unit dimensions: 1 × 1.5 mm² in cross section, length 46.28 mm, D_h 1.2 mm) in series. Pressure drop and heat‐transfer coefficients were experimentally measured. Flow and heat transfer in the experimental set‐up were simulated using computational fluid dynamics (CFD) models to understand the mechanisms responsible for performance enhancement. The CFD methodology, thus, developed was applied to understand the effect of various geometrical parameters on heat transfer enhancement. A criterion was defined for evaluation of heat transfer performance (heat transfer per unit pumping power), thus, ensuring due considerations to required pumping power. The effect of geometrical parameters and the corresponding mechanisms contributing for enhancement are discussed briefly. Based on the results, a design map comprising different serpentine channels showing heat transfer enhancement with pumping power was developed for Reynolds number of 200 which will be useful for further work on flow and heat transfer in serpentine channels. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1814–1827, 2013     

由蛇纹石制备高纯氧化铁的研究

以蛇纹石酸浸出液净化过程所获铁铝沉淀物为原料,采用氧化沉淀及煅烧法工艺制备了高纯氧化铁。通过对铁铝沉淀物精制、铁沉淀物的酸解、酸解液中三价铁的还原、铁溶液的净化、氧化铁前驱物α-FeOOH的制备与煅烧过程的研究,确定了优化工艺条件。实验结果表明,在优化工艺条件下,铁收率为99.9%,氧化铁纯度达99.8%,符合软磁铁氧体用氧化铁的质量要求。     

A study on nanofiller effects of serpentine in polypropylene matrix

The nanocomposite materials were prepared using serpentine as filler and polypropylene (PP) as the matrix in the presence of maleic anhydride grafted polypropylene (PP‐g‐MA) compatibilizer. The melt intercalation was carried out following serpentine modification with a quaternary salt of cetyl‐trimethyl‐ammonium bromide. The structure of nanocomposites was shown by X‐ray diffraction (XRD) and transmission electron microscopy (TEM) studies. Thermal analysis performed by differential scanning calorimetry (DSC) demonstrated that the nanocomposites have higher percentage crystallinity when compared to neat PP. Dynamic mechanical analysis (DMA) revealed that the storage and loss moduli values of the nanocomposites are better than those of the matrix resin. Tensile properties of nanocomposites are significantly different from PP, e.g., the Young's modulus of the nanocomposite with 2 wt % serpentine and 6 wt % PP‐g‐MA (PP‐2,6Q) was found to be 2065 MPa, i.e., nearly 190.8% increase over the PP matrix. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

从含镍蛇纹石中提取和富集镍的研究

用强酸将蛇纹石中的有价金属元素浸出到溶液中,再氧化处理浸出液,然后用NaOH-NH3·H2O进行混合沉淀,得到的铁镍混合物中TFe的质量分数为52％,回收率为90.23％,Ni的质量分数为1.5％,回收率为86.47％,超过了铁、镍可利用的工业品位要求,可分别作为冶炼铁、镍的原料.     

蛇形管内汽液泡状流与传热的数值模拟

建立了含有相变过程的汽液泡状流VOF数值模型,通过同实验进行流型对比,验证了模型的有效性。模拟研究了蛇形管内汽液泡状流传热过程,结果表明：二次流导致冷热流体混合;在单汽泡流动时,弯管壁面上温度场在汽泡经过后具有良好的恢复能力;在汽泡串流动时,二次流将弯管下半部温度较高的流体带入上半部,有效提升上半部壁温,从而造成上壁面温度在汽泡经过前后出现较大的变化。     

由蛇纹石制取镁、硅系列产品的研究进展

硫酸(或盐酸)浸取蛇纹石,分离得到富镁滤液和富硅滤饼,进而可以制备出品种丰富、附加值较高的镁和硅系列产品,如轻质氧化镁、氢氧化镁、五水偏硅酸钠、白炭黑等.本文对近年来蛇纹石酸浸工艺、镁和硅系列产品研发新进展进行了综述,对研发中存在的问题进行了分析,对今后的发展方向进行了展望.