The best known precious metals are the coinage metals, which are gold and silver. Although both have industrial uses, they are better known for their uses in art, jewelry, and coinage. Other precious metals include the platinum group metals: ruthenium, rhodium, palladium, osmium, iridium, and platinum, of which platinum is the most widely traded.[1]The demand for precious metals is driven not only by their practical use but also by their role as investments and a store of value. Historically, precious metals have commanded much higher prices than common industrial metals.
A metal is deemed to be precious if it is rare. The discovery of new sources of ore or improvements in mining or refining processes may cause the value of a precious metal to diminish. The status of a "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money.
Gold and silver, and sometimes other precious metals, are often seen as hedges against both inflation and economic downturn. Silver coins have become popular with collectors due to their relative affordability, and, unlike most gold and platinum issues which are valued based upon the markets, silver issues are more often valued as collectibles, far higher than their actual bullion value.[5]
Precious metals is in our DNA. Starting with the invention of the 3-way automotive catalyst, BASF has been at the forefront of innovation and creativity for decades. These qualities are at your disposal to enable future innovations and creations.
Building on our century old values, BASF has been a worldwide leader in the field of precious metals management and a full-service provider of precious metals products and services. By leveraging an unparalleled market insight as well as decades of precious metals sourcing, trading and hedging expertise, we create a tangible competitive advantage for our customers.
With more than 10,000 BASF research and development colleagues backing our efforts, we develop innovative products for customers. Our precious metal chemicals are used to produce pharmaceuticals, medical devices, fertilizers and more for a sustainable future.
We want to contribute to a world that provides a viable future with enhanced quality of life for everyone. We do so by creating chemistry for our customers and society and by making the best use of available resources. Sustainability is at the core of what we do, a driver for growth as well as an element of our risk management.
Alfa Chemistry has created a tangible competitive advantage for customers with high quality precious metal catalysts as well as optimal prices. Most of our products can be supplied ranging from milligrams to kilograms scale and arrived with technology documents (SDS, CoA or Spec Sheet). In regard to the metal catalysts, Alfa Chemistry can provide the most common types of catalysts.
Especially, precious metal catalysts are widely used in chemical processes for reactions, such as hydrogenation, asymmetric hydrogenation, dehydrogenation, reductive amination, alkylation, hydrogenation cracking reaction, disproportionation, degradation, carbonylation, hydrogenation selective oxidation, hydrosilylation, acetoxylation, dehalogenation, debenzylation, oxidizing reaction and gas purity reaction.
For this service, please visit Precious Metal Catalysts Recovery and Refining. With our expertise and considerable experience in the manufacture of precious metal catalysts, Alfa Chemistry has full confidence in providing the best products and customer service.
PTL Testing Laboratory, Inc. is pleased to provide inorganic and precious metal analysis for materials ranging from bullion and films to refining catalysts, glass, and solder. Our precious metal testing analysis can identify a variety of precious metals, including gold, iridium, platinum, and silver and we adhere to ASTM methodology. We currently offer several types of analysis, including inductively coupled plasma (ICP), wet chemistry, and fire assay, and typically accommodate the dental, electronics, jewelry, oil and gas, and refining industries. To learn more about inorganic and precious metal analysis with PTL Testing Laboratory, Inc. please contact us.
If your liquid chemicals contain gold, silver, platinum or other precious metals, how can they be separated (precipitated) out of their solutions and tuned into solid metallic form again? Several different processes can be used to precipitate previous metals from liquids. They are explained in this informative video from the International Precious Metals Institute:
Heraeus Precious Metals is headquartered in Hanau, Germany, and one of the world's leading suppliers of precious metal services and products. The company has significant expertise in the large-scale manufacture, development, and recycling of heterogeneous catalysts, which includes custom and toll manufacturing. In recent years, Heraeus Precious Metals has introduced numerous catalytic solutions centered around the generation (electrolysis), purification, and combustion (fuel cells) of hydrogen.
Heraeus Precious Metals is globally leading in the precious metals industry. The company is part of the Heraeus Group and covers the value chain from trading to precious metals products to recycling. In addition to gold and silver, it also has extensive expertise in all platinum group metals.
In our high grade refining department, we use specific acid formulations to dissolve, separate, precipitate and purify gold, silver and platinum group metals (PGMs). Our process utilizes glass lined tanks ranging in capacity from 50 to 750 gallons. This size range properly accommodates the wide variety and volume of precious metal bearing material that we purchase.
Expensive precious metals, such as platinum, are currently required in hydrogen fuel cells to efficiently catalyze the reactions they employ to produce electricity. Although alkaline polymer electrolyte membrane fuel cells (APEMFCs) enable the use nonprecious metal electrocatalysts, they lack the necessary performance and durability to replace precious metal-based systems.
Recent experiments with nonprecious-metal HOR electrocatalysts needed to overcome two major challenges, the researchers wrote: low intrinsic activity from too strong a hydrogen binding energy, and poor durability due to rapid passivation from metal oxide formation.
Their hydrogen fuel cell has an anode (where hydrogen is oxidized) catalyst consisting of a solid nickel core surrounded by the carbon shell. When paired with a cobalt-manganese cathode (where oxygen is reduced), the resulting completely precious-metal-free hydrogen fuel cell outputs more than 200 milliwatts per square centimeter.
The ideal method (3) for precious metal recovery from e-waste, therefore, should entail selective capture from chemically digested solutions without the need for incineration. It has been reported that nitrogen- or sulfur-bearing adsorbents provide the necessary affinity for high-uptake capacities. For example, imidazole immobilized on mesoporous silica and N,N-dimethylaminoethyl methacrylate (DMAEMA) covalently bonded onto a commercial polyethylene-coated polypropylene skin-core structure fiber have been reported (12, 13) as precious metal adsorbents. Recently, our team reported (14) that cyclodextrins could coprecipitate with gold ions by forming enzymelike complexes, an approach that could provide an economical means for gold recovery. Zirconium-based metal organic frameworks, such as UiO-66 and UiO-66-NH2, have also been screened (15) for precious metal uptake.
Biomaterials-based adsorbents, such as cross-linked polysaccharide gels and chemically modified persimmon tannin gels, have been investigated for precious metal recovery (16, 17), with high gold adsorption capacities of 7.57 and 7.7 mmol/g, respectively. Most adsorbents, however, are often tested in pure metal solutions or in the presence of a limited number of competing metals. These protocols, however, have economically less feasible uptake capacities or selectivities and are rarely reported for their applicability in actual e-waste or wastewater. A more targeted approach, employing strongly metal-binding chelators, is needed.
Porphyrins feature (18) remarkably high binding affinity and selectivity for transition metals, particularly the precious metals. Such powerful organic functionalities could, in principle, be employed in permanently porous network polymers in order to immobilize them for the recyclable separation of metals from a complex matrix. Two recent articles, one by our group (19) and another from Dichtel and coworkers (20), focus on removing emerging organic micropollutants from water; neither metals nor porphyrin-containing porous polymers, however, were addressed. The present challenge is to install porphyrins into materials, while using sustainable methods and starting materials.
Testing COP-180 in a mixture containing all common metals in the Periodic Table and gold capture from actual electronic circuit boards. (A) Mixed-metal selectivity test results summarized on a periodic table. (B) Real-life application of COP-180 for gold recovery from PCBs. The gold ingot is >99.6% pure. (C) Corresponding adsorption efficiencies of metals that are found in PCBs.
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