Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
United States Patent : US5542957 : Recovery of Platinum Group Metals and Rhenium from Materials Using Halogen Reagents
Author: Recovery of Platinum Group Metals and Rhenium from Materials Using Halogen Reagents
Author: Solvent Extraction
Author: Vladimir S KislikPublisher: Elsevier
ISBN: 0444537783
Category : Science
Languages : en
Pages : 573
Book Description
The main challenge in modern solvent extraction separation is that most techniques are mainly empirical, specific and particular for narrow fields of practice and require a large degree of experimentation. This concise and modern book provides a complete overview of both solvent extraction separation techniques and the novel and unified competitive complexation/solvation theory. This novel and unified technique presented in the book provides a key for a preliminary quantitative prediction of suitable extraction systems without experimentation, thus saving researchers time and resources. Analyzes and compares both classical and new competitive models and techniques Offers a novel and unified competitive complexation / solvation theory that permits researchers to standardize some parameters, which decreases the need for experimentation at R&D Presents examples of applications in multiple disciplines such as chemical, biochemical, radiochemical, pharmaceutical and analytical separation Written by an outstanding scientist who is prolific in the field of separation science
United States Patent : US4571262 : Recovery of Platinum Group Metals from Nickel-copper-iron Matte
Author: United States Patent : US5215575 : Recovery of Gold, Silver and Platinum Group Metals with Various Leachants at Low Pulp Densities
Author: United States Patent : US4571265 : Process for Separation and Purification of Platinum Group Metals (II).
Author: German Patent : DD265763 : Process for the Recovery of Platinum Group Metals from Heat Insulating Materials
Author: Recovery of Platinum, Palladium, and Gold from Stillwater Complex Flotation Concentrate by a Roasting-leaching Procedure
Author: Publisher:
ISBN:
Category : Flotation
Languages : en
Pages : 20
Book Description
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.
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