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Saturday, November 21, 2020 | History

3 edition of Methods For Producing Platinum-Group Metal Coatings From Molten Alkali Cyanides. found in the catalog.

Methods For Producing Platinum-Group Metal Coatings From Molten Alkali Cyanides.

United States. Bureau of Mines.

Methods For Producing Platinum-Group Metal Coatings From Molten Alkali Cyanides.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesInformation circular (United States. Bureau of Mines) -- 8974
ContributionsWalters, R., Flinn, D.
ID Numbers
Open LibraryOL21735579M

The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). Together with hydrogen they constitute group 1, which lies in the s-block of the periodic alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic properties. Silver, platinum, and palladium are metals that can be added to your precious metal portfolio, and each has its own risks and opportunities. Most Expensive Precious Metals: Platinum. Platinum is found in nature in a form that is extremely pure as well as rare. Platinum, which has a color code that can be described as White-Gray, is in the noble.


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Methods For Producing Platinum-Group Metal Coatings From Molten Alkali Cyanides. by United States. Bureau of Mines. Download PDF EPUB FB2

Methods for producing platinum-group metal coatings from molten alkali cyanides. Avondale, Md.: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC) Methods are described for the preparation and purification of the cyanide electrolyte. Vacuum drying, fusion, and purity of the cyanide salts are discussed.

Use of a sodium borosilicate test tube as a sodium-ion-conducting membrane for the addition of the desired platinum-group metal is described.

The optimum plating parameters of potential and current density for pt, pd, rh, ru, and ir coatings that result. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).

The process includes the steps of electrolytically dissolving an anode made of platinum or rhodium into a molten cyanide bath to prepare separately a platinum bath and a rhodium bath, forming a mixed bath having a predetermined ratio of platinum to rhodium from the separate platinum and rhodium baths, and electroplating platinum and rhodium onto a metal substrate, using a predetermined electrical charge.

The application of substantial coatings of some platinum group metals to non-metallic and metallic substrates can be achieved by a second metallising technique which utilises flame spraying methods. The coating metal is fed to a high temperature flame where it is melted, and the molten metal is then atomised and sprayed on to the substrate by a jet of high-pressure gas, usually air.

This process includes the steps of (a) immersing a first anode made of a platinum group metal and immersing a selective ion transport membrane containing a cathode and a first portion of a moisture-free, molten cyanide bath, into a second portion of the molten cyanide bath, the second portion being a selected quantity, and the molten cyanide bath containing a cyanide salt selected from the group consisting of sodium cyanide.

Extraction of platinum-group metals consists of the following steps: (a) mining ore rich in platinum-group metals while leaving rock lean in platinum-group metals behind; (b) isolating the platinum-group elements in the ore into a flotation concentrate consisting of nickel-copper-iron sulfides that is rich in platinum-group elements; (c).

There are needed galvanic baths for the deposition of silver and silver alloys which exhibit a high resistance to sulfur and contain the least possible amounts of alloyed platinum group metals and/or gold.

This is attained by using a salt melt as the electrolyte which melt contains a silver salt, alkali thiocyanate and salts of at least one alloying metal.

Methods for producing platinum-group metal coatings from molten alkali cyanides / (Avondale, Md.: U.S. Dept. of the Interior, Bureau of Mines, ), by R. Walters and David R. Flinn (page images at HathiTrust) Beitrage zur Chemie der Platinmetalle.

Festschrift der Jubelfeier des fünfzigjährigen Bestehens der Universetät Kasan. The platinum group metals are widely used as industrial catalysts Bauxite is the major ore of aluminum--the most abundant metal in earth's crust.

Produced by electrolyzing a molten mixture of cryolite and aluminum oxide, aluminum is a low-density metal widely used for. Catalyst deactivation: Catalysts are deactivated during use due to fouling, poisoning and/or thermal degradation/sintering (Bartholomew et al.,Dowden,Gates et al.,Trimm,Trimm,Twig, ).The deposition of coke is the most common form of catalyst fouling, and poisoning occurs because of strong chemical bonds between a feed component, such as.

at °C for 2 hours, the metal ions were added by D.C. electrolysis using an anode of the particular platinum group metal and a cathode of the same metal or of molybdenum. Coatings were generally made with electro- lytes that contained I to 3 per cent of the metal. Initially, the electrolyte temperature was °C for sodium cyanide and °C for.

A process for dissolving metals, alloys or metallic compound materials in metal cyanamide and/or thiocyanate and/or cayanide and/or halide melts containing optionally metal carbonate and/or cyanide, characterized in that substances are added to the melt which form or liberate CN, and/or CNO and/or SCN radicals in the melt under the reaction conditions.

Over the last two decades the Bureau of Mines had conducted several studies of the electrodeposition of platinum-group metals from a molten alkali metal cyanide bath. Bureau research has focused on producing platinum-group metal coatings on refractory metals and on more common structural materials.

This research has shown that high- quality thick, adherent, and coherent deposits can be. ri / separation of copper-nickel mattes from duluth gabbro concentrates by floatation and magnetic methods, pb, $ 20 ri / silver recovery from cyanide tailings using an acidic nacl-fecl2 leachant, pb, $ 40 ri / electrochemical studies of platinum-group metals in molten alkali metal cyanides, pb, $ 8.

The recovery of platinum group elements (PGE (platinum group element coating); Pd, Pt, and Rh) from used catalytic converters, using low energy and fewer chemicals, was developed using potassium. Molten globules of the metal are blown by a compressed air jet onto the previously grit blast cleaned steel surface.

No alloying occurs and the coating consists of overlapping platelets of metal and is porous. The adhesion of sprayed metal coatings to steel surfaces is considered to be essentially mechanical in nature. The behavior of platinum group metals (PGMs) during their recovery with smelting of spent automotive ceramic catalysts powder in the presence of metallic copper at elevated temperatures is studied in this paper.

Two different metal recovery mechanisms proved to be active in this process: 1) Wetting of micro-dispersed particulates of PGMs in the slag by molten copper, formation of copper. Electroforming of iridium, rhenium, molybdenum, niobium and other less common metals is a cost-effective method for the production of rocket combustion chambers as well as other thruster.

Electrochemical studies of platinum-group metals in molten alkali metal cyanides [Flinn, David R.] on *FREE* shipping on qualifying offers. Electrochemical studies of platinum-group metals in molten alkali metal cyanidesAuthor: David R.

Flinn. Simultaneous solubilization of all platinum metals can be accomplished by fusing the mineral concentrate obtained from copper and nickel sulfide ores with aluminum metal, dissolving the aluminum, and treating the residue with hydrochloric acid and chlorine.

Coating provides means for enhancing constructional strength of steels and al­ loysl. It makes possible a combined method when one group of dislocation mechanisms is used for bulk hardening (grain refining, creation of stable sub­ granular dislocation structures), while the working surface is hardened through other mechanisms (dislocation.

By heating in a microwave oven, sample dissolution time can be reduced to approximately 5 minutes. An inexpensive microwave oven provides extremely precise and efficient heating of the sample and acid mixture. Increased temperature and pressure in the sealed bottles accelerate sample dissolution.

As described in chapter 2, the primary purposes of high-temperature structural coatings are to enable high temperature components to operate at even higher temperatures, to improve component durability, and to allow use of a broader variety of fuels in land-based and marine-based gh high-temperature coatings protect the substrate, the demarcation between coating and substrate.

important metallic coating methods are described below. Electroplating This process can maintain high production rates. The process can be set up so that only specific regions of the Compressed air is than used to automise and spray the molten metal on to the.

Metal Coating Processes. Metal Coating Processes. The catalytic properties of the six platinum group metals (PGM)– iridium, osmium, palladium, platinum, rhodium, and ruthenium – are outstanding. Ruthenium dioxide is used as coatings on dimensionally stable titanium anodes used in the production of chlorine and caustic.

Alkaline Cyanide Free Zinc Electroplating Process. A discussion started in but continuing through Q. I work for a metal coating company. We are interested in alkaline cyanide free zinc process (especially zinc-iron and zinc-nickel) I need a starting point.

Chromate finishes are the first line of defense against corrosive attack on plated coatings. The thin, protective film on chromate finishes makes coatings more durable and increases the overall value of metal coatings.

KC Jones provides the full range of chromate conversion coatings. Start studying TPS Pre-AP Honors Chemistry - Chapter 11 Vocab. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The use of platinum-group metals in electric contacts has been the subject of numerous articles in Platinum Metals Review,79,80,, Resistors and Capacitors Windings in traditional wire-wound potentiometers and precision resistors are made from an alloy of palladium and 40% silver, because of its low temperature.

Platinum is one of the most sought-after precious metals in the world, as much for its aesthetic appeal as for its durability, which makes it ideal for a number of industrial applications.

Although platinum is extremely rare — more so than both gold and silver — it’s used to make around 20 percent of all consumer products either in a component of the product itself or as a part of the.

After the mixture is dissolved, iridium is separated from the other platinum group metals by precipitating ammonium hexachloroiridate or by extracting with organic amines. The first method is similar to the procedure Tennant and Wollaston used for their separation.

Nonelectrolytic coating by immersion in bath of molten metal to form predominantly single metal or alloy coating (e.g., hot dipping, etc.) Platinum group metal-containing alloy (i.e., contains Pt, Pd, Rh, Ru, Ir, or Os) Bath contains alkali metal or fluorine containing compound: Alkali metal.

Metal Coatings Corp. maintains a huge stock of coated B7 studs, threaded bar and 2H nuts. Available for same-day shipping in a wide variety of sizes, each is expertly coated with the proprietary FluoroKote #1® fluoropolymer coating process that offers easier assembly, fights corrosion and.

Several commercial techniques for producing such coatings on an industrial scale are known in the art. Cardarelli et al. have shown that among the plethora of coating techniques, thin, coherent and impervious tantalum coatings can be obtained by means of tantalum electroplating in molten alkali metal fluorides (12).

The history of the subject of interactions between metals and their salts in the molten state, though not well known to most chemists, is at least years old.' the production of deeply colored melts and on difficulties in recovering metal at the cathode upon electrolysis of molten alkali-metal hydroxides.

Alkali metals, peroxides and compounds that have peroxidized, and cyanide or sulfide compounds are classed as reactive. Toxicity. Toxicity is established through the Toxicity Characteristic Leaching Procedure (TCLP), which measures the tendency of certain toxic materials to be leached (extracted) from the waste material under circumstances.

Iridium is a chemical element with the symbol Ir and atomic number A very hard, brittle, silvery-white transition metal of the platinum group, iridium is considered to be the second-densest metal (after osmium) with a density of g/cm 3 as defined by experimental X-ray crystallography. However, at room temperature and standard atmospheric pressure, iridium has been calculated to have.

Platinum Group Metals and Compounds; Sedimentation. As of Septemberthe following articles were updated or added: Respiratory Disorders, 5. Oral Drugs for Obstructive Airway Diseases (R03) Respiratory Disorders, 6.

Cough and Cold Preparations (R05) Respiratory Disorders, 7. Antihistamines for Systemic Use (R06) Respiratory Disorders, 8. This paper investigates the recovery of platinum group metals (PGMs) from a dilute cyanide leach solution containing base metals, in a manner similar to that used for gold extraction in a typical CIP process, and focuses on both the adsorption and elution stages.

For aqueous samples containing - mg/L metal cyanide complexes, dissolved metal cyanide complexes are separated and quantified using anion exchange chromatography coupled with UV detection. For solid waste samples, the alkaline extraction procedure described in Method is necessary prior to chromatographic analysis of the.The total cyanide method generally used (the reflux mineral acid distillation) analyzes for all of the CN" groups in the sample, including the cyanide-metal complexes (except cobalt, gold, and some of the platinum group metals).

This method is defined in ASTM D and EPA's SW Methods .The outermost (Eta) layer of the coating is formed as the material is withdrawn from the molten zinc bath. This layer is a covering of pure zinc.

The underlying series of zinc–iron alloys in the coating are the result of a metallurgical reaction between molten zinc and the steel or iron material being galvanized.