Knowledge | 2022-12-17
The role of ultrasonic cleaning equipment in liquids. What's wrong with the cleaning?
The principle of the ultrasonic cleaning equipment is the recovery of some precious metal ions, such as silver ions, and other heavy metal ions, especially those that simply form environmental pollution of heavy metal ions such as chromium, copper, and other heavy metal ions. Electrochemical treatment of sewage, especially the ions in sewage, has many advantages. First, it reduces the ions in sewage, and second, the metal recovered by an electrochemical high-frequency rectifier can be recovered and reused, both useful maintenance of the environment, and can promote the development of waste recycling.
The electrolytic power supply used in sewage treatment has some requests, and the electroplating same, the electrolytic power supply in the sewage treatment skill usually is the high current low voltage direct current power supply or the single pulse power supply equipment, the development process is similar to that of electroplating power supply.
Now, most of the choice is high-frequency electrolytic power supply, which is conducive to the re-widening of power, reduce space occupation, reduce energy consumption, and forward working efficiency. Another very important point is that in electrolytic power, especially for sewage treatment, the current carrying capacity is much greater than the voltage, that is, high current low voltage, the voltage usually does not exceed 36V, normally 12V is sufficient, but the current ranges from 200A to 300A and from 2000A to 5000A or more depending on the composition of the wastewater and the treatment process.
Electrochemical methods in wastewater treatment have become increasingly sophisticated, and many types of electrochemical wastewater treatment skills are now very well developed, such as electroplating wastewater treatment, wastewater electrolysis recovery of precious metals, and other skills.
The use of other electrolytic power sources in metal recovery is similar to the use of metal recovery in wastewater treatment, the difference being that the concentration of metal ions in the wastewater recovered from metal recovery is higher, for example, wastewater from surface treatment plants such as electroplating plants and oxidation treatment plants has relatively reduced the cost of recovering metals, the metal recovery in sewage treatment is mostly to reduce the concentration of metal ions in sewage to meet the discharge standards, the metal recovery cost is relatively high.
Ultrasonic cleaning is mainly due to the ultrasonic cavitation effect. The strength of ultrasonic cavitation is related to the acoustic parameters and the physical chemistry properties of the cleaning solution. To obtain a good cleaning effect, it is necessary to select the appropriate cleaning fluid and appropriate ultrasonic acoustic parameters.
The lower the frequency of ultrasound, the easier the cavitation in the liquid, the greater the force, and the stronger the role, suitable for the workpiece (coarse, dirty) cleaning. High Frequency, the direction of ultrasound is strong, can concentrate energy on a small part of the workpiece for effective cleaning, suitable for fine parts cleaning.
For the general liquid, ultrasonic power density (acoustic intensity) increases, cavitation intensity increases, and the faster the speed, the better the cleaning effect. However, for precision, Surface roughness, the use of high-power density cleaning for a long time on the surface of the workpiece will produce "Cavitation" corrosion.
The ultrasonic cleaning medium mainly chooses the liquid which has low viscosity, low steam pressure, and low attenuation to the ultrasonic wave and chooses the liquid which has pertinence to remove the oil and dirt on the surface of the workpiece. In the use of ultrasonic cleaning, generally, there are two types of cleaning agents: chemical cleaning agents and water-based cleaning agents. The chemical action of the cleaning medium can accelerate the effect of ultrasonic cleaning. In addition to the physical effects of ultrasonic cleaning, the two combined to carry out a thorough cleaning of the workpiece.
4. Cleaning temperature
The effect of ultrasonic cavitation is weakened by increasing the temperature of the cleaning solution and the vapor pressure of the cleaning solution. Therefore, the choice of temperature is to consider the impact of cavitation strength, but also consider the cleaning fluid chemical cleaning effect. General water-based cleaning agents should be used at 40 ° C-60 ° C working temperature.