| Patent Number |
Title Of Patent |
Date Issued |
| 6679984 |
Method for recovery of gold and silver |
January 20, 2004 |
| An apparatus and method utilizing a strip solution for removing gold from the loaded activated carbon used to accumulate such gold leached from gold bearing ore, and for electrically removing such gold from the strip solution by electrowinning. The apparatus includes a pair of strip colu |
| 6268590 |
Apparatus and method for continuous retorting of mercury from ores and others mercury contaminat |
July 31, 2001 |
| A mercury retorting apparatus, a retorting system, and a method for continuous removal of mercury from dry, semi-granular, and sludge materials contaminated with mercury without shutting down the system for removal of accumulated liquid mercury, water, and dust particles. The retorti |
| 6017428 |
Electrowinning cell |
January 25, 2000 |
| An electrowinning cell and a cathode for use therein for removal of gold or other precious metals from a solution thereof in a suitable electrolyte. The cathode comprises a perforated steel plate wrapped in layers of woven wire mesh secured thereto. The cathode design is such that the ca |
| 5989486 |
Apparatus for removal of the mercury from granulated materials |
November 23, 1999 |
| An apparatus for retorting granulated material containing mercury such as ores and precipitates wherein the granulated material is stirred by means of a plurality of paddles while under vacuum and at high temperature within a drum of the apparatus. The vaporized mercury is drawn from the |
| 5891216 |
Oven mercury retorting device |
April 6, 1999 |
| A retorting device for mercury containing material, with an oven, mercury trap and condensers capable of operation at pressures from atmospheric pressure down to 50 Torr with simultaneous temperatures up to 1500.degree. F. A dam within the mercury trap permits removal of liquid mercury |
| 5551870 |
Rotating kiln seal |
September 3, 1996 |
| A rotating seal device for a rotary drum kiln. A rotating seal member is welded about the drum near each of its ends, each sealing against a rotationally stationary seal member joined with the associated kiln end hood through a flexible gas tight bellows. The stationary seal rides on a |
| 5198078 |
Procedure for electrolyte production of magnesium |
March 30, 1993 |
| A device for electrolytic production of elemental magnesium by electrolysis of magnesium chloride in a molten salt bath, including a magnesium transfer trough comprising a semicircular section of a standard steel pipe mounted straddling the upper edge of a steel cathode plate, with cross |
