Jiangsu Plaza Premium Electric Instrument Co.,Ltd.(HY)
Product description
Gold is the elemental form of the chemical element gold (chemical element symbol AU). It is a soft golden yellow,corrosion-resistant precious metal. Gold is one of the rarest, most precious and most valued metals. In the world, gold is generally in ounces. In ancient China, two ounces were used as gold units. It is a very important metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication, aerospace industry and other departments.
| Cleaning method of gold crucible |
| Boil in dilute hydrochloric acid or dilute nitric acid, among which dilute hydrochloric acid is more convenient to prepare (1-12) mol / L hydrochloric acid solution), note that the dilute hydrochloric acid used shall not contain nitric acid, nitrate, halogen and other oxidants. |
| If it cannot be cleaned with dilute acid, it shall be melted and cleaned with potassium pyrosulfate, sodium carbonate or borax. |
| If there are still stains or black on the surface, use the fine sand without sharp edges and corners passing 100 sieves to wet it with water and gently rub it to restore the luster of the surface. |
