the newbery–vautin chlorination process is a process to extract gold from its ore using chlorination developed by james cosmo newbery and claude vautin. the process of extracting gold from ores by absorption of the precious metal in chlorine gas, from which it is reduced to a metallic state, is not a very new discovery.
when all impurities have been removed from the gold observable by a change in flame color the gold is removed and processed in the manner required for sale or use. the resulting gold is 99.95% pure, but of lower purity than gold produced by the other common refining method, the wohlwill process, which produces gold to 99.999% purity.
fire refining. the initial product of copper smelting was impure black copper, which was then repeatedly melted to purify it, alternately oxidizing and reducing it. in one of the melting stages, lead was added. gold and silver preferentially dissolved in this, thus providing a means of recovering these precious metals.
pamp sa produits artistiques métaux précieux is an independently operated precious metals refining and fabricating company and member of the mks group.it was established in 1977 in ticino, switzerland. originally starting as a minting facility of bars weighing less than 100 grams, and as an alloy specialist for the jewelry and luxury watch-making industries, it has grown to provide .
under the influence of the applied electrical potential, copper ions migrate from the anode and deposit on the cathode, forming cathode copper. electrolytic refining of copper was first patented in england by james elkington in 1865 and the first electrolytic copper refinery was built in newark, new jersey, in 1883.
potential calcination is that brought about by potential fire, such as corrosive chemicals; for example, gold was calcined in a reverberatory furnace with mercury and sal ammoniac; silver with common salt and alkali salt; copper with salt and sulfur; iron with sal ammoniac and vinegar; tin with antimony; lead with sulfur; and mercury with aqua fortis.