The high content of gold, platinum and palladium precious metals is quickly dissolved with aqua regia and salt thinner. After filtration with anhydrous ethanol, the metal content is adjusted to 100G/L with water, adjusted to 1.5MOL with hydrochloric acid, and the solution is oxidized with oxidant. extraction, not at this time a total of DBC crafts platinum palladium iridium, S201 not co-extraction of platinum iridium, N235 is not a total extraction of iridium, the extraction process is smooth, the experiment in two ways at the factory in Shenzhen Jiang (but also in experiments at home, with DDO , brilliant green, to detect trace platinum iridium, palladium iodine method, telephone reported data) extraction.
First, after dissolving anhydrous ethanol in Wangshui, the nitrate is filtered, the content is adjusted, and the acid is directly extracted. The result is that S201 extracts palladium slowly (10 minutes), some palladium is difficult to extract, and a small amount of platinum is co-extracted.
The second is the rapid dissolution of Wangshui and salt thinner. After filtering with sodium hydroxide, the content is adjusted, the acid is adjusted, and the oxidant is added for 10 minutes. The machine is extracted. After repeated experiments, the extraction of gold, platinum, palladium and rhodium is very Thoroughly, especially S201 extracts palladium quickly (3.5 minutes), palladium has no residue in the night of extraction, and platinum is not co-extracted. This has become the principle of extracting and refining gold, platinum and palladium.
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