液膜萃取法回收废胶体钯活化液中的钯

传统钯回收方法存在成本高、分离效率低,适合高含量钯回收等问题,试验采用液膜萃取法回收废胶体钯活化液中的钯,并考察了内相试剂用量、流动载体用量、表面活性剂用量、油内比、乳水比、外相酸碱度等因素对钯萃取率的影响.结果表明:以9％N503、4％Span80、2％液体石蜡、85％磺化煤油组成膜相,内相试剂EDTA溶液浓度为0....     

Sorption of palladium(II) from nitric acid solutions by silica modified with amino groups

The sorption of Pd(II), Ag(I), and Cu(II) from nitric acid solutions with silicas chemically modified with γ-(aminopropyl)trietoxysiloxane is investigated. It is assumed based on the investigation of solid phases by IR and X-ray photoelectron spectroscopy and thermogravimetry that the following processes occur during the sorption of palladium from nitric acid solutions: coordination of palladium atoms to nitrogen atoms of the functional group, interaction of palladium ions with the silica matrix, and the formation of polynuclear complexes. It is proposed to use a 5% solution of thiourea in 0.1 M HCl. It is determined that the establishment time of constant values of sorption in static conditions is as follows, min: 10 for Ag(I), 20 for Cu(II), and 30 for Pd(II). A sorbability series of ions from 2 M HNO₃ in identical conditions is as follows: A_Ag(I) > A_Pd(II) ? A_Cu(II). Silver ions are not sorbed from solutions with the concentration of HNO₃ < 1 M, which will create prerequisites for the separation of ions.     

Investigating complex formation of palladium in desorption eluates from VP-1P anionite

Complex forms of palladium that are formed in ammonia-nitrate solutions during the desorption of platinum group metals (PGMs) from the VP-1P anionite are investigated. The possibility in principle of using the latter for the removal of PGMs from electrolytes in the refining technology of silver is confirmed.     

针铁矿吸附水中硫酸根离子的试验研究

利用合成的针铁矿对水中硫酸根离子进行吸附试验。试验表明，吸附量主要受pH值和硫酸根离子浓度影响。通过配位体交换理论，很好地解释了吸附量随pH下降而增加，随硫酸根离子浓度的下降而减少。     

Potentiometric anion selectivity of polymer membranes doped with palladium organophosphine complex

The potentiometric anion selectivity of polymer membrane-based electrodes formulated with a palladium organophosphine complex (benzylbis(triphenylphosphine)palladium(II) chloride) as the membrane active component is examined. The electrode is shown to exhibit a non-Hofmeister selectivity pattern with a significantly enhanced response toward nitrite over the concentration range of 10 microM-10 mM (log-linear range) and a detection limit 5.0 microM. The effect of lipophilic anionic (tetraphenylborate derivatives) and cationic (tetraalkylammonium) site additives within the membrane on the anion selectivity is examined in detail. Addition of both cationic and anionic sites is shown to improve potentiometric anion selectivity, suggesting that the palladium complex may operate simultaneously as a neutral and charged carrier-type ionophore within the polymer membrane phase. Using optimal membrane formulations (with added 20-30 mol % cationic sites), the sensors prepared with the palladium complex do not exhibit proton/hydroxide response in the range of pH 3.5-12, a potential advantage over previously reported nitrite electrodes prepared with Co(III) corrins and porphyrin complexes.     

焙烧-酸浸-氰化法从复杂金精矿中回收金银铜

采用焙烧-酸浸-氰化工艺综合回收复杂金精矿中的金、银、铜.结果表明,焙烧温度、焙烧时间、焙烧添加剂种类和用量对金、银、铜浸出率影响显著.实验确定了较优工艺条件为:焙烧添加剂NaOH用量为6 %,温度630 ℃,焙烧时间3 h,硫酸浓度1 mol/L,酸浸液固体积质量比5:1,酸浸温度50 ℃,酸浸4 h,氰化纳浓度3 ‰,氰化浸出液固体积质量比5:1,常温氰化72 h.在上述条件下,金、银、铜浸出率分别达到93.53 %、75.37 %、94.23 %.      

从铜精矿中回收钼的试验研究

简要介绍了从富家钨铜精矿中回收钼的试验工艺流程和试验指标。该铜精矿含钼0.825% ,获得钼精矿产率1.44% ,品位50.79 % ,回收率88.65 %的优良指标。     

某厂铜阳极泥中铜的回收试验研究

本文针对某厂铜阳极泥中铜含量高、难溶的特点,经过二次焙烧二次浸出,铜浸出率达９９％以上,硫酸铜结晶率〉９０％,海绵铜置换率〉９９％,铜总回收率〉９９％,该方法具有经济和环境双重效益。     

含锗渣浸出锗的研究

讨论了直接浸出、双氧水氧化浸出、焙烧氧化浸出对锗的浸出率的影响。结果表明,采用双氧水氧化浸出工艺,锗浸出率达90%以上。     

铜碲渣中碲的回收工艺研究

采用硫酸化焙烧—水浸脱铜—碱浸提碲—电积工艺回收铜碲渣中的碲,考察了NaOH浓度、温度等对碲浸出的影响,并对水解脱杂和碲电积工艺进行探索。结果表明,经过硫酸化焙烧、水浸后,铜脱除率为75%;电积产品碲纯度为99.90%,综合碲回收率约93%;金、银、铂和钯等贵金属进一步富集在碱浸渣中。     

含钴废料钴回收问题初探

本文在介绍含钴废料的来源、含钴 废料钴回收研究现状的基础上，提出了回收处理含钴废料的建议。     

从某银锰矿中回收银

研究了以氯化焙烧－氰化浸出工艺从银锰矿中回收银，考察了氯化钠加入量、矿石粒度、焙烧时间、焙烧温度对银浸出率的影响。试验结果表明，在矿样粒度小于15mm，矿样与氯化钠质量比为10：1，焙烧温度800℃，焙烧时间4h条件下，银浸出率可达到78％，比直接氰化浸出时高56％，同时金也被浸了同。浸出渣经磨细磁选可使其中的锰富集。