Ultrasonic Study Of Fe (oh) <sub> 3 </ Sub>, Of Mno <sub> 2 </ Sub> ¡¤ Xh <sub> 2 </ Sub> O And Cus Colloidal Particles Deposition Process

The sedimentation process of Fe(OH)3, MnO2·xH2O and CuS was investigated in the paper. The corresponding chemical precipitations were chosen to transform the Fe3+, Mn2+ and Cu2+metal ions into colloid respectively. The effect of ultrasound on the sedimentation of the depositions was studied.1 Effects of ultrasound on sedimentation process of Fe(OH)3 colloidNeutralization precipitation was chosen to transform Fe3+ into Fe(OH)3 colloid. Fe3+ in solution would be wiped off accordingly. Operating parameters such as ultrasonic power, frequency, ultrasonic time and operating temperature on the sedimentation process of Fe(OH)3 were studied respectively. Sedimentation rate and removal ration were investigated. The concentration of Fe3+ was determined by an UV-VIS Spectrophotometer method. The microstructure of Fe(OH)3 was examined by means of TEM. The experimental result shows that the sedimentation process for colloid flocculation can be improved by ultrasound but the final removal rate can't be changed. Under experimental conditions, the sedimentation process is assisted when increasing operating time from 5 minutes to 15 minutes, the rate of enhancement of sedimentation decreases after 20 minutes. The rate of enhancement of sedimentation rises up when increasing ultrasonic power from 40W to 60W but decrease when increasing ultrasonic power from 80W to 100W. The rate of enhancement of sedimentation decrease when increasing ultrasonic frequency from 24kHz to 78kHz. The effect of temperature on the sedimentation of Fe(OH)3 isn't obviously in the process. Comparing to silent condition, the particle size becomes bigger and the gathering state improves in ultrasonic condition.2 Effects of ultrasound on sedimentation process of MnO2·xH2O colloidOxidation and neutralization was used to transform Mn2+ into MnO2·xH2O colloid. Operating parameters such as ultrasonic power, frequency, ultrasonic time, and operating temperature on the sedimentation process were studied respectively. Sedimentation rate and removal ration were investigated. The absorbency of Mn2+ was determined by the flame atomic absorption Spectrophotometer. The microstructure of MnO2·xH2O was examined by means of TEM. The experimental results show that the sedimentation process for colloid flocculation can be improved by ultrasound but final removal rate couldn't be changed. Under experimental condition, the sedimentation process is assisted when increasing operating time from 1 minutes to 4 minutes. But effect of ultrasound on the sedimentation decreased when ultrasonic time was 8 minutes. The rate of enhancement of sedimentation rises up when increasing ultrasonic power from 40W to 80W but decreases when ultrasonic power is 100W. The rate of enhancement of sedimentation decreases when increasing ultrasonic frequency from 24kHz to 78kHz. The effect of temperature isn't obviously. Comparing to silent condition, the gathering state of MnO2·xH2O improves in ultrasonic condition.3 Effects of ultrasound on sedimentation process of CuS colloidSulphide precipitation was chosen to transform Cu2+ into CuS colloid. Ultrasonic power, frequency, ultrasonic time, and operating temperature on the sedimentation of CuS were studied respectively. The sedimentation rate and removal ration were investigated. The absorbency of Cu2+ was determined by the UV-VIS Spectrophotometer. The microstructure of CuS was examined by means of TEM. The experimental results show that the sedimentation process of CuS can be improved but final removal rate can't be changed. Under experimental condition, the sedimentation process is assisted when increasing ultrasonic time from 1 minutes to 5 minutes but decreased when increasing ultrasonic time from 15 minutes to 20 minutes. The rate of enhancement of sedimentation rises up when increasing ultrasonic power from 40W to 80W but decreases when ultrasonic power is 100W. The rate of enhancement of sedimentation decreases when increasing ultrasonic frequency from 24kHz to 78kHz. The effect of temperature isn't obviously. Comparing to silent condition, the particle size becomes bigger and the gathering state improvesd in ultrasonic condition.