Citric acid, also known as citric acid, is an important organic acid. It is a colorless crystal, odorless, has a strong sour taste, and is easily soluble in water. , is a natural preservative and food additive.
Citric acid can be used for metal purification and cleaning. For details, please refer to the following:
The metal purification formula based on citric acid can effectively remove the oxides formed on the surface of ferrous and non-ferrous metals. As a weak organic acid, it can cause slight damage to the metal surface layer. However, as a metal ion chelating agent, it accelerates the migration of metal oxides. In many steel pickling systems, in order to eliminate stress cracks in metal oxides and minimize the corrosion and embrittlement of high-strength steels, citric acid is used instead. Inorganic strong acid.
In boilers, heaters, superheater tubes, unclean reactors and stainless steel equipment, citric acid is generally used to pre-wash and purify to remove iron. , copper oxides, especially in Chemicalbook locations where chlorides are not allowed. The purification reaction of citric acid solution should be carried out when the temperature is higher than 37.8°C. The purification time should be prolonged when it is lower than 37.8°C. The amount of citric acid should be adjusted and the action conditions should be adjusted based on the increase or decrease in the estimated precipitation amount.
Citric acid is a highly efficient chelating cleaning agent, effective on calcium, magnesium, iron, chromium, copper and other dirt, and is widely used for cleaning various metal surfaces. , the waste water after washing can be biodegraded and does not pollute the environment. In recent years, citric acid is suitable for chemical treatment of metal purification, and is also suitable for non-polluting ashing of waste solvents. The citric acid molecules in the ash are burned into CO2 and water vapor, and valuable metals can be recovered from the ash. , toxic or radioactive elements can be fully enclosed for chemical treatment.
