One of the simplest methods in iridium recovery and purification is the chemical precipitation method, suitable for scrap containing about 20% iridium. The basic principle of this method is to use chemical reactions to separate iridium from the solution in the form of a precipitate, and then purify the iridium precipitate to obtain pure iridium metal.
To recycle iridium scrap, the scrap containing iridium needs to be crushed to an appropriate size. Then, the crushed waste is dissolved in aqua regia. For example, about 3 liters of aqua regia is required for 1 kilogram of iridium scrap. Stir at room temperature for about 2 hours to ensure complete dissolution of iridium. Then, insoluble materials are removed by filtration to collect the iridium-containing solution.文章源自平泽贵金属回收公司 www.51gjs.comPINGZE Precious Metals Recycling-https://en.51gjs.com/47104.html
During the dissolution process, iridium metal transforms into iridium ions in the solution. Next, an alkaline precipitating agent containing hydroxide is added to the solution to convert iridium ions into insoluble iridium hydroxide precipitate. Approximately 100 milliliters of 10% sodium hydroxide solution is added per liter of iridium-containing solution. After complete precipitation of iridium ions, the precipitate is filtered and washed to remove impurities, yielding pure iridium hydroxide precipitate.文章源自平泽贵金属回收公司 www.51gjs.comPINGZE Precious Metals Recycling-https://en.51gjs.com/47104.html
The key step in this iridium scrap recycling process is the treatment of the iridium precipitate. The filtered and washed iridium hydroxide precipitate is calcined at high temperatures to convert into iridium metal powder. The calcination temperature is controlled at around 1000°C for about 2 hours to obtain iridium metal powder.文章源自平泽贵金属回收公司 www.51gjs.comPINGZE Precious Metals Recycling-https://en.51gjs.com/47104.html 文章源自平泽贵金属回收公司 www.51gjs.comPINGZE Precious Metals Recycling-https://en.51gjs.com/47104.html