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Methods Involved In Ultrasonic Fragmentation And Extraction

Methods Involved In Ultrasonic Fragmentation And Extraction


Extraction of Natural Components

Local high temperature and pressure produced by energy coalescence of ultrasonic cavitation can break cell wall, shorten extraction time, lower extraction temperature and reduce the amount of solvent. The extraction rate of Chinese herbal medicines increased with the increase of ultrasonic time. When the time increased to a certain extent, the extraction rate increased slowly, but decreased after the critical point.

Leaching

Ultrasonic can change the surface properties of solid particles, destroy the passive coating, promote the leaching reaction of leaching agent, enhance the efficiency of soaking, and shorten the soaking time. It has been reported that ultrasonic radiation can enhance gold leaching, increase the leaching speed to 10-100 times, and reduce the use of Qing compounds [7].

flotation

Ultrasonic can change the particle size, surface activity and dispersion degree of flotation substances, and can improve the flotation speed. 32 kHz ultrasound can be used in desulfurization of peat flotation to improve the flotation recovery and selectivity [4].

Electrodialysis

Ultrasonic can also play a role in electrodialysis separation. When the potential difference exists on both sides of Nafion membrane, the mass transfer rate of PB2 + in the membrane increases 9 times [5] under the action of ultrasound. The ability of electrolyte to pass through the membrane can be improved by applying ultrasound radiation, thus the efficiency of electrodialysis can be improved.

Membrane separation

Ultrasonic can improve the permeability and salt permeability of cellulose acetate membrane [1], improve the microfiltration efficiency, reduce the adhesion on the membrane surface, and reduce the energy consumption of microfiltration pump [2], but the excessive power of acoustic wave will affect the membrane life [3]. It is necessary to select the appropriate sound pressure and frequency range.

precipitate

In the early stage of precipitation formation, ultrasound can break large ice crystals, which is beneficial to the growth of crystals and accelerates precipitation. During the aging process of precipitation, the agglomeration and acceleration of sedimentation can be achieved by the violent collision and adhesion of ultrasonic wave. The application of ultrasound in liquor clarification process can greatly reduce the settling time and increase the efficiency by tens of times.

Crystal

Ultrasound can affect the crystal growth of supersaturated solution and the crystal structure during solidification. Cavitation can adjust the crystal size distribution during initial nucleation and produce more secondary nuclei, which makes the crystallization easier and faster, thus improving the efficiency



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