载银抗菌材料及其制品

介绍各类载银抗菌材料及其制品,如载银羟基磷灰石,磷酸锆银,银沸石,含银玻璃等的性能与生产,以及抗菌纤维,抗菌塑料制品和抗菌陶瓷等。     

提高月山铜矿铜精矿含银量选矿实验研究

铜矿石中常伴生金、银等贵金属,但浮选所得铜精矿中贵金属的品位有时低于相关标准而难以计价。针对安徽月山铜矿矿石,在不改变现场浮选设备的情况下,通过浮选药剂的调整、工艺流程的改进等措施来探讨提高铜精矿含银量的途径。通过药剂和工艺调整,铜精矿品位达到32%左右,铜回收率维持在96.6%以上,同时铜精矿含银量能够达到23 g/t以上。     

含银废料来源及银的回收方法

从固态和液态两个方面论述了含银废料的来源。针对不同来源的含银废料，总结了常用银的回收技术包括电解法、沉淀法、还原法、吸附法，并且指出了废料中银回收技术的发展方向应转向对高效吸附回收收法的研究。     

富银铜锌多金属矿选矿试验研究

某富银铜锌多金属硫化矿,其银品位为125 g/t,铜品位为0.26%,锌品位为1.13%,硫品位为3.04%;90%的银赋存于银黝铜矿、黝铜矿等铜矿物中。采用“优先浮银铜﹣锌硫混浮﹣锌硫分离”工艺流程进行处理,选择高效银捕收剂SAC强化银的回收,全流程实验获得的银(铜)精矿含银10094 g/t,含铜16.67%,银回收率88.78%,铜回收率80.23%,锌精矿含锌45.46%,锌回收率81.81%。实现了矿石中银铜锌的综合回收。     

含银方铅矿表面性质及捕收机理模拟计算研究

采用丁铵黑药、乙基黄药和乙硫氮3种硫化矿捕收剂对含银方铅矿进行浮选试验,基于密度泛函理论对浮选机理进行了模拟计算研究。浮选试验表明,与高碱性矿浆相比,含银方铅矿更适宜在pH为9.5的弱碱性矿浆中浮选;丁铵黑药表现出对含银方铅矿更强的选择性和捕收性。捕收机理研究结果表明,与理想方铅矿相比,含银方铅矿的带隙更窄,此外费米能级附近也新增了银原子的4d轨道,表明含银方铅矿具有更强的电化学反应活性。根据前线轨道理论,当采用丁铵黑药和乙基黄药做捕收剂时,含银方铅矿的前线轨道有效质量更低,表明含银方铅矿更易与这2种捕收剂发生吸附;随着银含量的增加,吸附过程的前线轨道有效质量呈明显下降趋势,也表明银原子会增强捕收剂与矿物表面的吸附过程。分子动力学模拟计算结果表明,丁铵黑药在含银方铅矿表面的吸附能最低,表明丁铵黑药对含银方铅矿选择性最好。     

银的杀菌功能

<正> 银是一种亮白色金属。银手饰、银餐具和银元等十分常见。银除了作导线、导电糊和触点外,银的主要用途是用卤化银作胶卷和照像纸等。银一个重要性能是它能杀灭细菌、真菌和霉菌。每升水含银离子100μg,便足以使多数细菌死亡。银离子、可溶性银化合物、含银的离子交换剂、比表面极大的胶态银、纳米银等均可杀菌。     

含银废料来源及银的回收方法

从固态和液态两个方面论述了含银废料的来源.针对不同来源的含银废料,总结了常用银的回收技术包括电解法、沉淀法、还原法、吸附法,并且指出了废料中银回收技术的发展方向应转向对高效吸附回收法的研究.     

某含银高硫铜矿的综合回收试验

某含银高硫铜矿含铜0.76%、硫24.35%及银34.92 g/t，有价矿物种类多、矿石性质复杂，采用抑硫优先浮选铜-活化浮选硫的原则工艺流程进行试验，配合石灰作为硫化铁矿物抑制剂以及筛选出丁基黄药+酯-105作为硫化铜矿物的组合捕收剂，强化了银在铜精矿中的富集。在选定工艺条件下，可获得铜品位21.60%、银品位602.84 g/t的铜精矿(铜和银回收率分别为89.30%和54.39%)，硫品位45.60%、银21.55 g/t的硫精矿(硫和银回收率分别为89.79%和29.59%)，实现了铜、硫和银的综合回收利用。     

用硫代硫酸钠从分银渣中提取银

本文对采用硫代硫酸钠浸出银，连二亚硫酸钠还原银的工艺从分银渣中提取银进行了研究，结果表明：当分银渣中含银量为0．38％，硫代硫酸钠的用量为160kg/t，氨水用量为50L/t，浸出温度60℃，浸出温度为3h，采用二段浸出，其浸出率＞86％，采用连二亚硫酸钠还原银，还原率＞95％，同时，还原后液可再生用于浸出。     

从废X光胶片中回收银的方法

1.概述白银自古以来就与黄金一起受到人们的珍视。因此,除开发含银矿产或与银伴生的矿产外,必须加强银的再生回收工作。日本从照相废液中回收银的企业有150多家,每年回收银300～400吨,美国和加拿大,每年消耗的银分别为1555吨和466吨,而大约有36％的银消耗于各个医院临床治疗和研究用的X光胶片。     

Silver electrodeposition from air and water-stable ionic liquid: An environmentally friendly alternative to cyanide baths

The influence of temperature on the kinetics and the morphology of silver deposits obtained from an air and water-stable ionic liquid (the 1-butyl-3-methyl imidazolium tetrafluoroborate) was studied by means of cyclic voltammetry and chronoamperometry. The nucleation and growth mechanisms have been investigated and the effect of temperature evaluated up to 200 °C. Dense, pure and very thin (about 0.3 μm) silver coatings, with decorative properties, have been obtained on commercial copper electrodes at different temperatures. The characterization of the deposits morphology has been performed by visual investigation and SEM microscopy. Data about thickness were acquired by Calotest® measurements. The deposits result constituted by pure silver as determined by combination of EDX microanalysis and Auger Electron Spectroscopy (AES). The deposition method promises to be a new, environmentally friendly, method for silver electrodeposition which is the reason for the absence of cyanide and volatile toxic solvents in the electroplating bath.     

Sustained electroless deposition of metallic silver from a choline chloride-based ionic liquid

This work demonstrates that a sustained galvanic coating of silver can be deposited onto copper substrates from a solution of Ag⁺ ions in an ionic liquid (IL) based on a choline chloride (ChCl) eutectic. The sustained growth of the silver deposit was facilitated by the porous nature of the film and is proven using acoustic impedance spectroscopy on a quartz crystal microbalance (QCM). The silver and copper surfaces were characterised using atomic force microscopy (AFM) and scanning electron microscopy (SEM/EDX). In the commercial process of dip coating silver from ions in aqueous media, deposition does not continue once surface coverage has been achieved, without the use of catalysts. The process reported here using ionic liquids produces silver deposits of several microns by dip coating without the use of catalysts or strong inorganic acids.     

堆浸法从含银氧化铁矿中提取银

云南个旧某矿氧化矿石中,除Sn以外还伴生有丰富的Ag。为了解决Ag的回收利用问题,作者等人对该矿石进行了柱浸、槽浸、堆浸和回收Ag的试验,取得较好的效果。用堆浸法进行较大规模的生产,Ag回收率为34．96％,达到综合回收利用资源的目的。     

Preferential sulfation of nickel and cobalt in lateritic ores

Pilot plant operations have confirmed the validity of a process for the recovery of nickel and cobalt from the ores of laterite deposits, the world’s largest known reserves of these metals.     

完善立式电解槽电解精炼银的技术工艺

叙述立式银电解精炼的技术改进：①银电解中的残极处理方法，②电解银粉的出槽，③硝酸银的制备与废液的处理方法，④溶液循环系统的设计。     

Use of ferricyanide for gold and silver cyanidation

Low gold and silver leaching kinetics has been commonly observed in traditional gold-silver cyanidation process, especially in heap leaching and in situ leaching operations. The different mineralogy of gold and silver in the ores is suspected to be the main reason, e.g., the occurrence of low solubility acanthite (Ag2S) typically results in low overall silver extraction. Due to the low solubility of oxygen in cyanide solution, the reactivity and availability of oxidant is believed to be the critical limitation for gold and silver dissolution. The use of ferricyanide as the auxiliary oxidant for gold and silver cyanidation has been examined. The rotating disc test results prove the assistant effect of ferricyanide on increasing the dissolution rate of gold and silver. The potential use of ferricyanide in gold/silver cyanidation process is proposed based on the leaching results of actual ores.     

BiohydrometaUurgy applied to exploitation of black shale resources:Overview of Bioshale FP6 European project

Bioshale project, co-funded by the European Commission （FP6 programme）, started in October 2004 and finished in October 2007. The main objective of this project was to define innovative biotechnological processes for ＂eco-efficient＂ exploitation of black shale ores. The black shale ores contain base, precious and high-tech metals but also high contents of organic matter that handicap metal recovery by conventional techniques. Three world class black shale deposits were chosen as targets of the R＆D actions. These include one deposit that existed under natural conditions （Talvivaara, Finland）, one currently in process （Lubin, Poland） and one after mining （Mansfeld, Germany）. The main technical aspects of the work plan can be summarized as follows： evaluation of the geological resources and selection of metal-bearing components; selection of biological consortia to be tested for metal recovery; assessment of bioprocessing routes, including hydrometallurgical processing for metals recovery; techno-economic evaluation of new processes including social and environmental impacts. An overview of the main results obtained by the 13 European partners （from 8 countries） involved in this completed research programme is given in this work.     

从锌浸出渣中回收银的方法

一般湿法炼锌厂所产出的锌浸出渣含有相当数量的银、锌及稀散金属。近２０年来，人们从这类残渣中回收银及人价金属的研究和生产方法归纳起来可分为３类；浮选富集，火法富集和直接浸出银。讨论了各种方法的基本原理，优点和缺点，以及研究方向。     

High temperature friction and wear behaviour of Ni–P–Ag–Al2O3 hybrid nanocomposite coating

Abstract

Codeposition of silver and alumina particles has been performed within an Ni–P coating on carbon steel samples by electroless deposition to form an Ni–P–Ag–Al₂O₃ hybrid nanocomposite coating. The structure of heat treated coatings was evaluated by XRD analysis. Tribological properties of the coatings were investigated by a pin-on-disc test method using a 52100 steel pin as counter body at high temperature. A 3D optical profiler was employed to measure the wear rate of the deposits. Surface morphology, cross section and wear scars of the coatings were studied by using SEM equipped with EDS analysis. The results showed that tribological properties of Ni–P–Ag–Al₂O₃ hybrid coating are similar to Ni–P–Ag conventional composite coating. Moreover, friction coefficient and wear resistance of the hybrid coating are strongly influenced by self-lubricating silver thin layers formed between mating surfaces during high temperature sliding wear.     

Effects of electrolyte thickness,chloride ion concentration,and an external direct current electric field on corrosion behaviour of silver under a thin electrolyte layer

ABSTRACT

Effects of electrolyte thickness, chloride ion concentration, and an external direct current electric field (DCEF) on the corrosion behaviour of silver under a thin electrolyte layer (TEL) were investigated using electrochemical and surface techniques. The results indicate the corrosion rate of silver increases with the decrease of TEL thickness and the increase of chloride ion concentration. Moreover, an interesting conclusion was drawn that the corrosion rate of silver near the positive plate of DCEF first increases and then decreases with the increase of electric field intensity. In a DCEF, different polarisation behaviours of silver at different positions were attributed to the differences of the local corrosion environment.