Shopping malls generally have jewelry calculated by gram and jewelry calculated by bite price, and the price calculated by gram is also very different, so there has never been a unified national price for platinum jewelry. It is directly related to brand pricing. Merchants with the same technology and brand can sell at a fixed price, while some merchants without brand can sell by gram.
Production of platinum
Like other platinum metals, platinum is a by-product of commercial mining and processing of nickel and copper. In the electrolytic refining process of copper, silver, gold, platinum, selenium and tellurium will sink to the bottom of the tank to form "anode mud". The extraction process of platinum group metals begins with this turbid substance.
If pure platinum is found in quicksand sediments or other minerals, it can be extracted during impurity removal. Platinum has a higher density than most impurities, so lighter impurities can be easily extracted by buoyancy separation.
Platinum is paramagnetic, while nickel and iron are ferromagnetic. After the mixture passes through electromagnet, nickel and iron will be separated. Platinum has a high melting point, so melting at high temperature can remove many impurities.
Finally, platinum is not corroded by hydrochloric acid and sulfuric acid. After the mixture is stirred, the impurities will naturally dissolve, and the rest is platinum.
Primary platinum also contains gold and other platinum elements. In order to purify original platinum, it can be treated with aqua regia. Palladium, gold and platinum will dissolve, while osmium, iridium, ruthenium and rhodium will not react. After adding ferric chloride, gold will precipitate out and can be filtered out.
After adding ammonium chloride, ammonium chloroplatinate will precipitate and can be converted into platinum metal after heating. Unprecipitated hexachloroplatinic acid (IV) can be reduced by zinc. In the laboratory, platinum can also be extracted from a small amount of residue in a similar way.
Refer to the above? Baidu Encyclopedia-Platinum