We recycle imported connectors containing gold and palladium. These connectors are analogs of domestic connectors RPPM 17-48 (containing gold and silver), on the processing of which we have a separate video ( • Gold and silver from connectors RPPM17-48-3 ). Such connectors are disassembled much easier than domestic ones, the yield of the ligature was 127.7 grams. The refining process begins with etching the ligature with nitric acid. The gold husk is filtered and dissolved in a mixture of ammonium chloride and nitric acid. The resulting gold-containing solution is filtered first through cotton wool, then through filter paper. After heating, urea (carbamide) is added to the solution and the first reduction of gold is carried out using hydrazine sulfate. The resulting gold sediment is washed with water and dissolved in a mixture of ammonium chloride and nitric acid. After dissolving the gold, the remaining nitric acid was quenched with urea, and the reduction was carried out using hydroxylamine hydrochloride. After the reaction, the gold precipitate was washed and sent for drying. A solution of dimethylglyoxime in acetone (it dissolves very well, especially when heated) was poured into the palladium-containing solution obtained during etching of the ligature. 4 grams of dimethylglyoxime were used. The dimethylglyoxime complex of palladium is formed quite quickly, but we left the beaker with the solution for about a day. The solution contained a large number of salts, and therefore filtration was difficult - the dimethylglyoximate precipitate flew through the filter, so the solution had to be diluted with water and filtered again. The filters with the palladium complex precipitate were transferred to a chemical beaker and filled with aqua regia. The resulting mushy mass was filtered on a Buchner funnel. The precipitate on the filter was filled with water, mixed well and filtered. The resulting palladium-containing solution was poured into a beaker and filled with ammonia solution. At this stage, we ran out of ammonia solution (the medium has an acidic reaction), had to visit a pharmacy in the middle of the night). After adding ammonia (until the reaction was alkaline), the solution was filtered, heated and filled with hydrazine hydrate. The contents of the beaker were divided into 2 parts. More hydrazine hydrate was added to one and potassium hydroxide was sprinkled. When it was added, the solution began to hiss (the reaction was quite violent) and a palladium precipitate immediately began to form, and a palladium mirror formed at the point of contact between the alkali and the glass. We do not know of anyone using this method of recovery, perhaps we were the first). The other part of the solution did not give such an amount of palladium precipitate even when boiling, but when alkali was added, palladium was reduced as actively as in the first case. The palladium precipitates were combined and the solution was acidified with dilute sulfuric acid. For testing, a solution of dimethylglyoxime in acetone was poured into it. No complex was formed. The palladium precipitate was filtered, washed and sent for drying. The yield was 1.3 grams. After fusion, the weight of gold was 0.9 grams, and that of palladium was 1.3 grams. We recommend watching our previous videos: Gold and silver from RPPM-17-48-3 connectors - • Gold and silver from RPPM17-48-3 connectors Gold from Socapex connectors - • Gold from Socapex connectors Gold from Tesla optocouplers - • Gold from Tesla optocouplers Link to the VK page https://vk.com/id534555423