Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 5458744 | Process to produce hydrogen and/or hemihydrate calcium sulphate from calcium sulphite A process for producing hydrogen and/or hemihydrate calcium sulphate from calcium sulphite. Waste solid containing calcium sulphite and other calcium salts is treated by the addition of aqueous sulphur dioxide solution or sulphuric acid solution to produc... | 10/17/1995 |
| 5204084 | Hydrometallurgical production of zinc oxide from roasted zinc concentrates A process is provided for obtaining high quality high surface area zinc oxide from a roasted zinc sulphide concentrate by leaching with an ammoniacal ammonium carbonate solution. The process utilizes optional preliminary oxidation and water leaching steps... | 04/20/1993 |
| 5028410 | Hydrometallurgical production of zinc oxide from roasted zinc concentrates A process is provided for obtaining high quality high surface area zinc oxide from a roasted zinc sulphide concentrate by leaching with an ammoniacal ammonium carbonate solution. The process utilizes optional preliminary oxidation and water leaching steps... | 07/02/1991 |
| 4937056 | Process for obtaining high purity magnesium compounds from magnesium containing materials Processes for the selective leaching of magnesium-containing solids, which contain calcium and/or heavy metals, and the selective precipitation and crystallization of the leached magnesium are provided. The leaching is conducted with aqueous sulphur dioxi... | 06/26/1990 |
| 4789529 | Recovery of zinc from zinc bearing sulphidic ores and concentrates by controlled oxidation roasting A process is described for the controlled oxidation roasting of zinc bearing sulphidic ores and concentrates by adjusting the furnace temperature and residence time together with the oxygen availability to the sulphide retention requirements in the calcin... | 12/06/1988 |
