Download or read book Amagnite Process for the Recovery of Platinum written by Platinum Metals Co. (Philadelphia) and published by . This book was released on 1918* with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methods for the Recovery of Platinum Iridium Palladium Gold and Silver from Jewelers Waste written by Charles Wesley Davis and published by . This book was released on 1924 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery of Platinum Palladium and Gold from Stillwater Complex Flotation Concentrate by a Roasting leaching Procedure written by and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bureau of Mines devised a procedure for selectively extracting platinum-group metals (PGM) and gold from Stillwater Complex flotation concentrate. The Stillwater Complex is the only major U.S. PGM resource. Development of a suitable extraction technique will contribute to its exploitation. The concentrate was roasted at 1,050° C to convert host base-metal sulfides to oxides and the PGM from sulfide minerals to their elemental states. The roasted concentrate was preleached with dilute sulfuric acid to remove easily soluble gangue minerals. After pre-leaching, the concentrate was slurried with 6M HCI and leached at ambient temperature and pressure with a strong-oxidizing agent. Hydrogen peroxide, chlorine, sodium hypochlorite, nitric acid, and a persulfate salt were the oxidants investigated. The two-stage leaching scheme ex-tracted up to 97 pct of the platinum, 92 pct of the palladium, and 99 pct of the gold from the roasted concentrate. The base metals were not solubilized and reported to the residue. No attempt was made to devise a procedure to recover the copper and nickel because they comprise less than 5 pct of the value of the concentrate. Viable techniques for recovering the precious metals from the pregnant solution were sulfide precipitation, cementation with nickel, or adsorption on activated carbon.

Download or read book Recovery of Platinum Group Metals from Automobile Catalytic Converters written by and published by . This book was released on 2007 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Platinum has played important roles in human life due to their specific physical and chemical properties. The demand of platinum was reported to be continuously increasing, especially the use in automobile catalytic converters, while natural resources of platinum becomes limited. Therefore, the study of platinum recovery from spent automobile catalytic converter, which is an important secondary resource of platinum, becomes significant. In this study, platinum recovery process consists of two stages; platinum extraction by leaching with aqua regia and then platinum separation from the solution by co-precipitation. In the platinum extraction process, influences of time and temperature were investigated to identify optimum condition for the leaching process. The result showed that the maximum platinum extraction was obtained when leaching at 90 °C for 6 hours. However, at this condition, aluminum which is the major component in catalytic converter was also highly extracted. The coexistence of aluminum in the leachate will retard the co-precipitation of platinum (IV) with iron hydroxides, which is the second stage of platinum recovery. Hence, the optimum leaching condition here was considered to be leaching at 90°C for 1 hour. In the second stage of platinum recovery, platinum co-precipitation with various metal hydroxides was selected for this study. The metal hydroxides used in this study were hydroxides of Al, Mg, Fe (II) and Fe (III), which are major components in the catalytic converter and also dissolved in the leachate. Influences of pH and precipitation time were investigated. The result showed that almost all platinum (IV) was effectively co-precipitated with iron hydroxides at pH 6 in 1 hours. The chemical state of platinum investigated by XPS showed that co-precipitated platinum was partly reduced to platinum (II) with iron (III) hydroxide and some was further reduced to metallic platinum with iron (II) hydroxide. These facts suggest that iron hydroxide is considered as an effective carrier for co-precipitation of platinum.

Download or read book Processes for the Recovery of Platinum from Spent Catalytic Converters written by Greg Randall Lee and published by . This book was released on 1980 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Recovery of Platinum group Metals and Gold from Sources Containing Same written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A process for the recovery of platinum group metals (PGMs) and gold from source materials having a high chromium content, low nickel and copper contents, and generally a low sulphur content, is described. The source material is formed into a feed mixture (pelletized if necessary) containing 2 to 30 per cent chromium; 5 to 15 per cent iron, slagging agents providing a basicity of from 0,4 to 1,5; and carbon or silicon reductants sufficient to reduce the greater proportion of the iron oxides present and some of the chromium present. The feed mixture is smelted optionally in a plasma-arc furnace at a minimum temperature of 1400 degrees C, and preferably above 1500 degrees C, to form a collector metal phase of Fe-Cr-Ni-Si-C which is crushed or granulated and the material is treated hydrometallurgically to recover collected PGMs and gold.

Download or read book A Recovery Method for Platinum Group Metals written by F. Matsuyama and published by . This book was released on 1989 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin of Photography written by and published by . This book was released on 1917 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Successful Development of an Industrial Process for the Recovery of Platinum group Metals from the UG 2 Reef written by and published by . This book was released on 1987 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Processing and Recovery of the Platinum group Elements written by Nicholas Mark Lindsay and published by . This book was released on 1988 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery of Platinum Palladium and Gold from Stillwater Complex Flotation Concentrate by a Roasting leaching Procedure written by and published by . This book was released on 1985 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mineral Resources of the United States written by United States. Bureau of Mines and published by . This book was released on 1919 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wilson s Photographic Magazine written by and published by . This book was released on 1917 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Photographic Journal of America written by and published by . This book was released on 1917 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin of Photography written by John Bartlett and published by . This book was released on 1917 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Minerals Yearbook written by and published by . This book was released on 1919 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Jewelers Circular written by and published by . This book was released on 1917 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt: