| 摘要 |
<p>A new platinum refining method which has a low energy cost, is not harmful to the human body since chlorine gas is not used, and has low facility and equipment costs due to low corrosion properties when refining scraps containing 75 to 99 wt.% of platinum that are disused after having been used in various industrial fields is provided. A refining method of high purity platinum from platinum scrap comprises the steps of: adding aqua regia into platinum scrap containing 75 to 99 wt.% of platinum in an amount of 200 ml per 10 g of the platinum scrap and heating and decomposing a mixture of the platinum scrap and aqua regia at 80 to 90 deg.C, thereby preparing a hydrogen hexachloroplatinate solution; forming an ammonium hexachloroplatinate precipitate by adding ammonium chloride to platinum ions dissolved into the solution to remove nickel, molybdenum, iron, etc. contained as impurities in the hydrogen hexachloroplatinate solution; filtering the ammonium hexachloroplatinate precipitate, cleaning the filtered ammonium hexachloroplatinate precipitate with ethyl alcohol, and dissolving the cleaned ammonium hexachloroplatinate precipitate into distilled water; and adding a hydrochloric acid solution into the dissolved solution to prepare an electrolyte, maintaining temperature of the electrolyte to 50 to 60 deg.C by using a high density graphite plate as an anode and using a platinum plate as a cathode, and flowing a DC(Direct Current) power source through the electrolyte and performing electrolysis at a current density of 2 to 3 A/dm^2, thereby electrodepositing platinum onto the cathode.</p> |
