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IRIS RARE COLLECTION (General)

by PASHISH @, Friday, January 20, 2012, 12:10 PM (4495 days ago) @ ramnath

<- - text removed by Admin - -> your Iris Rare collection zone <- - text removed by Admin - -> does not know who invented the Iridium, and they claim that they are some company? Have you seen their office? why dont they give the fone number of USA office? Just call those <- - text removed by Admin - -> people and tell them that Iridium was invented by British scientist Smithson Tennant (1761–1815) and not by Johnson Matthey, ask this <- - text removed by Admin - -> company under whose conspiracy these people are making Indian Youths to run behind a mirage like so called fortune money? Is it USA or China? RICE PULLER is a conspiracy to make Indian Young Generation useless.

Iridium is obtained commercially as a by-product from nickel and copper mining and processing. During electrorefining of copper and nickel, noble metals such as silver, gold and the platinum group metals as well as selenium and tellurium settle to the bottom of the cell as anode mud, which forms the starting point for their extraction.[46][49] In order to separate the metals, they must first be brought into solution. Several methods are available depending on the separation process and the composition of the mixture; two representative methods are fusion with sodium peroxide followed by dissolution in aqua regia, and dissolution in a mixture of chlorine with hydrochloric acid.[18][40] After it is dissolved, iridium is separated from the other platinum group metals by precipitating (NH4)2IrCl6 or by extracting IrCl2− 6 with organic amines.[50] The first method is similar to the procedure Tennant and Wollaston used for their separation. The second method can be planned as continuous liquid–liquid extraction and is therefore more suitable for industrial scale production. In either case, the product is reduced using hydrogen, yielding the metal as a powder or sponge that can be treated using powder metallurgy techniques.[51][52] Annual production of iridium circa 2000 was around 3 tonnes or about 100,000 troy ounces (ozt).[note 3][10] The price of iridium as of 2007 was $440 USD/ozt,[46] but the price fluctuates considerably, as shown in the table. The high volatility of the prices of the platinum group metals has been attributed to supply, demand, speculation, and hoarding, amplified by the small size of the market and instability in the producing countrie

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