Fashion Jewelry Production Of Platinum Jewelry Material
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Platinum together with the rest of the platinum metals is obtained commercially as a by-product from nickel and copper mining and processing. During electrorefining of copper Tiffany and Co Silver Spends line net to knit bracelet , 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 the extraction of the platinum group metals. <IMG border=0 src="http://china-wholesalejewelry/upfile/product/201007/13/482x482_9463213714_s.jpg">
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If pure platinum is found in placer deposits or other ores, it is isolated from them by various methods of subtracting impurities. Because platinum is significantly denser than many of its impurities, the lighter impurities can be removed by simply floating them away in a water bath. Platinum is also non-magnetic, while nickel and iron are both magnetic. These two impurities are thus removed by running an electromagnet over the mixture. Because platinum has a higher melting point than most other substances, many impurities can be burned or melted away without melting the platinum. Finally Tiffany and Co Classic 925 Silver-Alloy 1837 Tiffany Bracelets-Bangles , platinum is resistant to hydrochloric and sulfuric acids, while other substances are readily attacked by them. Metal impurities can be removed by stirring the mixture in either of the two acids and recovering the remaining platinum.
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One suitable method for purification for the raw platinum, which contains platinum Tiffany and Co notes locket jewelry , gold, and the other platinum group metals, is to process it with aqua regia, in which palladium, gold and platinum are dissolved, while osmium Tiffany and Co return to tiffany round tag charm cufflinks jewelry , iridium Tiffany and Co cushion hoop earrings jewelry , ruthenium and rhodium stay unreacted. The gold is precipitated by the addition of iron(III) chloride and after filtering of the gold, the platinum is precipitated by the addition of ammonium chloride as ammonium chloroplatinate. Ammonium chloroplatinate can be converted to the metal by heating.
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