precious metals Articles

  • Global Initiatives to Increase the Sustainable Use of Precious Metals

    The period from September through to January sees a number of important holidays for many countries and these holidays represent the peak season for gift giving. Many people’s thoughts often turn to luxury items such as jewelry as well as to electronic items such as mobile phones, MP3 players and the like. ...


    By SGS

  • E-scrap: metals too precious to ignore

    Increased recovery of waste electrical and electronic equipment (WEEE) is providing the global recycling industry with fresh challenges. Researchers from Berlin’s University of Technology have been taking a close look at the material flowing into and out of the recycling process, paying special attention to the precious metals content. Their main conclusion is that conventional sorting ...

  • Analysis of precious metals in jewelry

    Abstract For thousands of years, man learned the craft of making jewelry from gold. Gold is a noble metal which does not react with the air and has a shiny yellow color.Over the years, alloying of the gold was necessary to improve its properties since pure gold is too soft to be used for jewelry. Alloying of the gold is usually by low-cost metals such as copper, zinc, silver or nickel. ...


    By Xenemetrix Ltd.

  • Advanced Threeway Catalysts

    One area of catalyst system design which has received relatively little attention is the method of application of precious metal, specifically with regard to its positioning in the catalyst. Recent advances in catalyst coating technology have enabled both washcoat and precious metals to be distributed inhomogeneously (zoned) along the length of a catalyst monolith. With the option of zone coating ...

  • Property improvements of nano TiO2 in photodegradation of organic pollutions: a review

    Nano TiO2 as a potential photocatalyst has been widely studied for application of environmental decontamination. In this paper, we examine and review the efforts in property improvements by modification, synthesis technique and operation parameter combined with some theory analysis. The effects of the modification by coupling with precious metal and narrow semiconductor, and doping with N, S, ...


    By Inderscience Publishers

  • VSEP provides crystal clear permeate and recovers precious metals from the mining leachate at 97% recovery

    A unique membrane filtration system, known as V✧SEP (Vibratory Shear Enhanced Process), was developed by New Logic of Emeryville, California. The technology employs vibrational oscillation of an advanced polymeric membrane to improve the throughput and to prevent colloidal fouling of the membrane surface. This new technology provides a innovative and cost effective method of recovering ...


    By New Logic Research, Inc.

  • Particulate Venturi Scrubber System

    A precious metal refiner required the most advanced particulate scrubber to replace wet ESP for submicron particulate collection. Due to the very high gold prices, economic reasons were the driving force toward maximum removal efficiency. Macrotek was selected to design and install their ultra high efficiency flooded disc MVA scrubber. In addition to the high removal efficiency for submicron ...


    By Macrotek Inc.

  • Cleaning without material loss

    Cleaning without material loss: Hydraulic Easy Cleaning-Construction reduces cleaning of the Single-shaft shredder and facilitates work processes Many materials have to be comminuted before further processing - this includes different chips and stamped parts made of plastic and metal, but also valuable precious metals such as gold and silver as well as laboratory samples. In this process, a part ...

  • Property improvements of nano TiO
    2
    in photodegradation of organic pollutions: a review

    Nano TiO2 as a potential photocatalyst has been widely studied for application of environmental decontamination. In this paper, we examine and review the efforts in property improvements by modification, synthesis technique and operation parameter combined with some theory analysis. The effects of the modification by coupling with precious metal and narrow ...


    By Inderscience Publishers

  • Metal ions biosorption from dilute aqueous solution

    Biosorption, using non-living biomass (mostly suspended), is briefly reviewed in this paper as applied to toxic metal ions removal, with particular focus on the kinetics and engineering considerations of the process. Several diverse kinetic models were successful in fitting the experimental data. Evidence was provided that the metal biosorption (on Aeromonas caviae biomass) is a complex process. ...


    By Inderscience Publishers

  • Determination of Major Components and Trace Contaminants in Assorted Plating Baths by Atomic Absorption Analysis

    Precious metal, non-ferrous, and ferrous plating operations cover almost every facet of modern life: automotive parts, kitchen & bathroom fixtures, electrical parts, electronic components, furniture, tools, plumbing, construction supplies, die castings, jewelry, etc. Good manufacturing practices, and lately, government regulations for environmental safety, have prompted many plating operations ...


    By Buck Scientific Inc

  • Thermal Plasma Technology Supports Precious Metal Recovery from WEEE

    The article provides an overview of the history of electrical wastes, where we are today and the potential value that can be generated from recovering the valuable precious metals it contains going forward.   The article also discusses how Tetronics’ patented DC Plasma technology has been successfully employed in a wide range of environmental applications including Precious Metal ...

  • A direct method for ultrafine gold networks with nanometre scale ligaments

    Preparation of precious metals into porous structures in nanoscale regime is currently only achieved by dealloying processes, in which a second or third component is leached out of matrices of metal alloys. To avoid loss and hassle of recovery of leached precious metals, direct synthetic methods should be developed. In this work, we report our chemical synthesis of ultrafine gold networks through ...


    By Inderscience Publishers

  • Use of ozone in the treatment of cyanide containing effluents

    The treatment of effluents of the gold and silver cyanidation process is one of the main problems that the precious metals industry faces. These effluents contain variable quantities of free cyanide, weak complexed cyanide, strong complexed cyanide and thiocyanate. Different methods are used for the removal of cyanide but most of the times the consumption of reagents raises the operation cost to ...


    By Absolute Systems Inc.

  • Efficient Treatment of Complex Wastewaters at Umicore Precious Metals using Biotechnology

    Untitled Document Paques and Umicore have demonstrated the feasibility of biological treatment of the highly complex Hoboken wastewaters in ...


    By Paques Technology B.V.

  • PEDOT–PSS/MWCNT coatings on PET for conducting polymer actuators

    The electrochemical deposition of a conducting polymer on a non–conductive polymer requires a conductive layer, which can be achieved by sputtering or vaporisation of precious metals such as gold or platinum. In this investigation we coated poly(styrenesulphonate) doped poly(3,4–ethylenedioxythiophene)/multi–walled carbon nanotubes (PEDOT–PSS/MWCNT), in a ratio of 2.4 : 1 on a poly(ethylene ...


    By Inderscience Publishers

  • Spatial and temporal variations in the transport and storage of trace metal contaminants in the upper Rio Pilcomayo, southern Bolivia

    Mining of the Cerro Rico de Potosi precious metal-polymetallic tin deposits of Bolivia began in 1545 and has led to severe contamination of water and sediments of the upper Rio Pilcomayo drainage system. Detailed geomorphological, stratigraphic and geochemical analyses show that the downstream transport and deposition of sediment-borne trace metals from Cerro Rico vary among three types of river ...


    By Inderscience Publishers

  • The bullion room case study

    The new Thermo Scientific Niton DXL provides speed, reliability and efficiency for Europe’s largest precious metal dealer. The Bullion Room was founded in 2004, turning over £70,000 in its first year of trading. This year it is on target to hit a turnover of £1 billion, handling 1.5 tonnes of gold per week and placing it firmly as Europe’s largest privately owned precious ...


    By Niton UK Limited

  • Materials flow of platinum group metals in Germany

    Platinum group metals have become indispensable in modern industrial society and the demand for PGMs has greatly increased. An in-depth quantitative analysis of PGM applications, lifecycle structure, deficits and optimisation potential in Germany has been carried out by Umicore Precious Metals Refining and Oko-Institute. Besides detailed insights into one of the more opaque metal markets, the ...


    By Inderscience Publishers

  • Activated Carbon for Precious Metals Recovery

    Untitled Document Summary: Guidelines are presented for the selection, handling and regeneration of activated carbon used in gold recovery operations. The guidelines are based ...


    By Calgon Carbon Corporation

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