用离子交换法处理浓度Pt、Pd、Rh溶液的试验

叙述了从失效汽车尾气净化催化剂浸出液中用离子交换法直接分离Rh并富集Pt、Pd的试验过程,并对树脂的最大吸附量、淋洗液的选择和对淋洗率的影响,以及对树脂的再生作了初步的探索,确定了该工艺的可行性。     

从溶液中萃取分离Pt、Pd、Ir和Rh的试验研究

利用萃取法进行了从铂族金属溶液中分离Pt、Pd、Ir和Rh的试验研究。结果表明,三烷基氧化磷（TAPO）可以从铂族金属溶液中选择性萃取Pt、Pd、Ir,而Rh留在萃余液中。用30%（V%）TAPO有机相萃取含Pt～0.1 g/L、Pd～0.25 g/L、Ir～2.6 g/L和Rh～10 g/L的料液,10级错流萃取（相比1∶1）,萃余液中的Pt可降至小于1 mg/L、Pd小于0.5 mg/L、Ir～100 mg/L,Ir萃取率大于96%。萃余液、反萃液精炼后分别产出99.95%Rh和Ir,回收率Rh 95%、Ir 90%。     

DDO光度法连续测定铂钯

提出了不经预分离，直接用DDO光度法测定溶液中共存铂、钯的方法。同一试液取两份，一份使钯显色、不使铂显色、测定钯、并在铂的测定波长下测定吸光度、作为测铂时的空白。另一份使铂、钯共同显色，在铂的测定波长下测定吸光度，扣除空白即为铬络合物的吸光度，以此测定铂。方法可用于废汽车尾气净化催化剂中铂、钯含量的分析。     

铂铱合金的分离与提纯

1　前言铱是贵金属中化学稳定性最好的金属 ,也是唯一可以在氧化条件下应用到温度达 2 30 0℃时也不发生严重损伤的金属。铱的这些优良特性 ,使得它与铂、钯、铑制成的合金不仅被广泛地用作电阻和触点材料 ,而且还被广泛应用于高熔点激光材料制备方面。贵金属原料稀有、贵重 ,所以在铂铱制品的加工和使用过程产生的废屑、废品及残品极具回收价值。但是 ,铂铱废料的回收和再生过程中所采用的分离和提纯方法 ,在溶解方面还未取得满意效果 ,从而影响其回收率的提高。针对这一难点 ,作者应用中频感应炉内锡碎化法 ,对铂铱合金的溶解进行了试验研…     

铂铑回收分离提纯工艺研究

在铂铑金属分离中,最经典的方法是水解沉淀法.由于铂、铑的化学性质非常接近,在水解沉淀过程中部分二价铂会产生沉淀,很难使铂铑分离彻底,而且工艺冗长,金属直收率低.采用水解沉淀与阴离子树脂交换相结合的方法分离铂铑,铂的吸附率达96.1％;铑的收率达98.5％.     

从微电子元件废料中回收钯、银

本文论述了从微电子元件（ＰｄＡｇＣｕＮｉ０．１－１０）废料中回收钯、银的方法。采用硝酸溶样．氯化钠沉淀分离银：氨络合盐酸化除铜、镍、铁等贱金属而制取高纯度钯、银。     

从富铋的铂钯物料中提炼铂、钯的工艺研究

富含铋的贵金属原料,成分复杂,铋含量27%,贵金属含量38%,其中,铂含量4.37%,钯含量接近30%。采用水溶液氯化法溶解—氯化铵沉淀铂钯—还原溶解—氯化铵反复沉淀的分离工艺。铂回收率98%、钯回收率99%。流程短、操作简单、成本低。     

幼儿入园分离焦虑的问题、原因及对策分析

幼儿入园时的分离焦虑如果长时问无法得到缓解,有可能引发幼儿的生理、心理以及家园关系等相关的负面问题.导致幼儿入园分离焦虑的原因是多方面的,解决的策略也应从多角度入手.教师和家长在幼儿入园前要做好充分准备,在入团适应阶段要采取时间管理、转移注意等方式缓解幼儿情绪,还要进行充分的交流与沟通,运用博客、论坛、档案记录方式进行有效的家园合作,形成缓解幼儿分离焦虑的合力.     

用Cyanex921-甲苯萃取分离Pt,Pd和Rh--一种用于从废催化剂中回收铂族金属的方法

图１铂族金属萃取率与HCl浓度的关系（有机相：７５mmol·L－１Cyanex９２１；水相：Rh（Ⅲ）、Pt（Ⅳ）和Pd（Ⅱ）浓度均为１mmol·L－１；振荡时间：１０min）１前言铂族金属广泛地应用于催化反应、电子器件、航空航天等领域，在汽车尾气净化催化剂中的应用也与日俱增。铂族金属价格高，需求量大，促使人们从低品位矿和废催化剂中回收它们。由于铂族金属在氯化物水溶液中的化学性质极其相似犤１犦，分离和提纯它们是十分困难的，有必要开发一种更为有效的分离与提取方法。关于铂族金属的提取分离，许多作者［２～７］早有研究，也有许…     

从铂钯精矿中回收铂、钯、金的工艺研究

采用离子交换法富集溶液中低含量的贵金属,萃取法提取铂钯,再结合传统的选择性沉淀法实现杂质分离。流程短,污染少,回收率高,有价金属都能得到综合利用。     

JTPA,black employment,and occupational change: Separating out cyclical changes from program changes

Evidence from Bridgeport, Connecticut’s Job Training and Partnership Act program is examined to determine if black employment and the occupational distribution of jobs held by blacks has been affected. Historical employment data is used to illustrate the cyclical nature of employment growth. It is concluded that the increases in black employment over the first nine months of the program are only partially the result of program. A second conclusion is that the occupational distribution of jobs in the program does not differ from the distribution of jobs of blacks not in the program. A third conclusion is that the program is underfunded.     

Separating the Political and Technical: Accounting Standard‐Setting and Purification

The U.S.‐based Financial Accounting Standards Board (FASB) emphasizes that accounting standard‐setting is not and should not be regarded as a “political process.” Employing the case of accounting for stock compensation, I examine a recent debate in which FASB appears to have successfully established and maintained a boundary between a technical accounting process and politics. This case is interesting because an earlier, failed effort to expense stock compensation was described as highly politicized. However, the boundary between technical and political processes was maintained in the more recent episode. I find that a focus on due process, characterizations of existing accounting requirements as anomalous and available measurement methods as reliable, and warnings about the dangers of injecting “politics” into standard‐setting were important to this boundary work. I also find that the boundary work required considerable interpretive flexibility in selecting (or ignoring) the evidence to be used in justifying the standard‐setting project and its conclusions. I conclude by suggesting that a different understanding of what it means to be involved in a “political process” might help all parties understand more fully what is taking place during the accounting standard‐setting process. Attention could be turned to developing processes to facilitate debates over which values should guide decisions occurring throughout the standard‐setting process. To this end, an enhanced standard‐setting process might allow for increased participation in agenda setting, in framing and scoping standard‐setting projects, and in providing opportunities for nonexperts to participate.     

粘胶工艺废气处理与溶剂回收

依据GB16297—1996 大气污染物综合排放标准，对各类粘胶过程产生的甲苯、二甲苯和非甲烷总烃等的排放量要达到限值要求。很多制造业中涉及粘胶工艺，如制鞋、制特种衣物等。溶剂胶具有制造简单、使用方便、粘合强度高等特点，深受企业欢迎。然而，它含有大量的有害挥发性溶剂，在粘胶工艺废气中的有机气体主要来自溶剂和稀释剂，有机溶剂在操作过程中，在粘附的表面会缓慢挥发。另一方面，在加热固化过程中也将全部释放形成有机废气。     

国有企业主辅分离改革及市场关系再造

文章考察了我国传统国有企业主辅产权制度，讨论了我国现行国有企业主辅分离改革的体制设计的逻辑局限性，在此基础上，提出了基于市场合约的国有企业主辅关系再造的观点。文章的探讨增加了我们观察国有企业制度变革与市场整合的角度，拓宽了我们进行政策讨论与选择的视野。     

富集铑铱置换渣中贵金属的工艺研究

铑铱置换渣组分复杂,铑铱含量约0.6%,Zn和Cu为主体,含Se等非金属也较高。采用浓硫酸加保护剂浸出贱金属,浓碱浸出Se、Te等非金属,浸出液中Rh损失率0.15%、Ir小于4.77%,置换渣失重率96.55%。铑铱富集渣可用盐酸溶液体系加氧化剂溶解造液。