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| Number | Title | Issue Date |
| 6945114 | Laser-air, hybrid, ultrasonic testing of railroad tracks Formed Laser Sources (FLS) using pulsed laser light for generation of ultrasonic stress waves are combined with air-coupled detection of ultrasound to provide for the hybrid non-contact, dynamic and remote ultrasonic testing of structural materials, especially railr... | 09/20/2005 |
| 6602319 | Process for the recovery of gold and silver from used refractory bricks The present invention relates to a process for the recovery of gold and silver from the used refractory bricks of Dore furnace. This invention particularly relates to a process for the recovery of gold and silver from the used refractory bricks generated ... | 08/05/2003 |
| 6290747 | Conversion of impure silver halide to ultra-pure silver metal A method for preparing ultra-pure silver from a crude silver halide matrix containing metallic and/or non-metallic impurities, said method comprising; roasting the crude silver halide matrix to substantially remove carbonaceous material; treating the roas... | 09/18/2001 |
| 5626645 | Process for making silver metal filaments A process for making silver metal particles from silver salt particles having the same morphology. Precursor silver salt particles selected from the group consisting of silver acetate and silver sulfide having a selected morphology are contained in a reac... | 05/06/1997 |
| 5443614 | Direct smelting or zinc concentrates and residues The present invention is concerned with a process for the direct smelting of zinc containing materials. The process includes volatilizing zinc from zinc-containing materials into a gas phase, while sulphur is fixed as iron sulphide in a Fe-S-O matte. Ther... | 08/22/1995 |
| 5169682 | Method of providing silver on calcium carbonate material such as coral sand A method of providing silver on a calcium carbonate material having fine pores, such as coral sand, oyster shells, and crab shells, including (a) contacting a calcium carbonate material with an aqueous solution of silver nitrate for a time effective for t... | 12/08/1992 |
| 4497658 | Compact precious metal furnace and recovery method A highly compact and efficient tilting crucible furnace and smelting method is disclosed for use in the direct smelting of a precious metal containing material. A furnace body having a refractory lined cavity which has a top opening is pivotally mounted o... | 02/05/1985 |
| 4451290 | Recovery of platinum group metals from scrap and residues A process for the recovery of platinum group metals, Ag and Au from a precious metal containing residue which includes the platinum group metals, Ag and Au together with Fe, Cu, Ni, Se and Te, the process comprising the following steps: (a) smelting the p... | 05/29/1984 |
| 4448604 | Recovery of precious metals from leach residues This invention relates to the recovery of platinum group metals and Au and Ag from high sulphur content base metal sulphide ore residues and also to the separation of Ag from the other precious metals referred to. The process for the recovery of platinum group... | 05/15/1984 |
| 4441923 | Integrated process using non-stoichiometric sulfides or oxides of potassium for making less active metals and hydrocarbons Disclosed is a combinative integrated chemical process using inorganic reactants and yielding, if desired, organic products. The process involves first the production of elemental potassium by the thermal or thermal-reduced pressure decomposition of potas... | 04/10/1984 |
| 4404027 | Method of recovering heavy metals In a method of recovering heavy metals from filter residues containing metal oxides, metal hydroxides or metal carbonates, the residues are dried and reduced during heat supply in the presence of carbon-containing reducing agents. The metal-containing fil... | 09/13/1983 |
| 4397686 | Method for refining precious metals A method for economically removing base metal impurities, other oxidizable impurities, and volatile impurities from precious-metal-bearing metallic materials, consisting of silver and gold, to obtain, with high recovery, a resultant precious metal of high... | 08/09/1983 |
| 4389247 | Metal recovery process A process for recovering a metal in its elemental state from an oxide or salt of the metal comprising passing the metal oxide or salt and a reducing gas concurrently downward through a packed bed at a temperature above the melting point of the metal in it... | 06/21/1983 |
| 4243411 | Reduction of metal sulfides A method for the recovery of a desired metal (e.g., copper) from its sulfide ore by reaction with process metal (e.g., aluminum) capable of forming at least a high sulfide and subsulfide compound. The aluminum subsulfide compound is reacted with the coppe... | 01/06/1981 |
